Bayesian models provide a structure for studying collections of parameters such are considered in the investigation of communities, ecosystems, and landscapes. This structure allows for improved estimation of individual parameters by considering them in the context of a group of related parameters. Individual estimates are differntially adjusted toward in overall mean, with the magnitude of their adjustment based on their precision. Consequently, Bayesian estimation allows for a more reliable ranking of parameters and, in particular, a more credible identification of extreme values from a collection of estimates. In Bayesian models, individual parameters are regarded as values sampled from a specified probability distribution, called a prior. The requirements that the prior be known is often regarded as an unattractive feature of Bayesian analysis and may be the reason Bayesian analyses are not frequently applied in ecological studies. Empirical Bayes methods provide an alternative approach that incorporates the structural advantages of Bayesian models while requirng a less stringent specification of prior knowledge. Empirical Bayes methods require only that the prior be in a certain family of distributions, indexed by hyperparameters that can be estimated from the available data. This structur is of interest per se, in addition to its value in allowing for improved estimation of individual parameters; for example, hypothese regarding the existence of distinct subgroups in a collection of paramet ers can be considered under the empirical Bayes framework by allowing the hyperparameters to vary among subgroups. We describe the empirical Bayes approach in application to estimation of proportions, using data obtained in a community—wide study Brown—headed Cowbird paratism rates for illustration. Empirical Bayes estimates identify those species for which there is the greatest evidence of extreme parasitism rates. Subgroup analysis of our data on cowbird parasitism rates indicates that parasitisms rates for neotropical migrants as a group are no greater than those of resident/short—distance migrant in this forest community. Our data and analyses demonstrate that the parasitism rates for certain neotropical migrant species (Wood Thrush and Rose—breasted Grosbeak) are remarkably low while those for others (Ovenbird and Red—eyed Vireo) are remarkably high.
","language":"English","publisher":"Ecological Society of America","doi":"10.2307/2265751","usgsCitation":"Link, W.A., and Hahn, D., 1996, Empirical Bayes estimation of proportions with application to cowbird parasitism rates: Ecology, v. 77, no. 8, p. 2528-2537, https://doi.org/10.2307/2265751.","productDescription":"10 p.","startPage":"2528","endPage":"2537","numberOfPages":"10","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":196322,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"77","issue":"8","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a19e4b07f02db60561f","contributors":{"authors":[{"text":"Link, William A. 0000-0002-9913-0256 wlink@usgs.gov","orcid":"https://orcid.org/0000-0002-9913-0256","contributorId":146920,"corporation":false,"usgs":true,"family":"Link","given":"William","email":"wlink@usgs.gov","middleInitial":"A.","affiliations":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"preferred":true,"id":338177,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hahn, D. Caldwell 0000-0002-5242-2059","orcid":"https://orcid.org/0000-0002-5242-2059","contributorId":26055,"corporation":false,"usgs":true,"family":"Hahn","given":"D. Caldwell","affiliations":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"preferred":true,"id":338178,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":22642,"text":"ofr96401 - 1996 - Digital elevation model test for LIDAR and IFSARE sensors","interactions":[],"lastModifiedDate":"2012-02-02T00:07:57","indexId":"ofr96401","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"96-401","title":"Digital elevation model test for LIDAR and IFSARE sensors","language":"ENGLISH","publisher":"U.S. Geological Survey, National Mapping Division,","doi":"10.3133/ofr96401","issn":"0094-9140","usgsCitation":"Canfield, D., 1996, Digital elevation model test for LIDAR and IFSARE sensors: U.S. Geological Survey Open-File Report 96-401, 55 p., :ill. ;28 cm., https://doi.org/10.3133/ofr96401.","productDescription":"55 p., :ill. ;28 cm.","costCenters":[],"links":[{"id":155367,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1996/0401/report-thumb.jpg"},{"id":52111,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1996/0401/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a9ae4b07f02db65d4ad","contributors":{"authors":[{"text":"Canfield, Dan","contributorId":75567,"corporation":false,"usgs":true,"family":"Canfield","given":"Dan","email":"","affiliations":[],"preferred":false,"id":188623,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":23021,"text":"ofr96364 - 1996 - Documentation of a computer program (RES1) to simulate leakage from reservoirs using the modular finite-difference ground-water flow model (MODFLOW)","interactions":[],"lastModifiedDate":"2018-01-30T19:20:57","indexId":"ofr96364","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"96-364","title":"Documentation of a computer program (RES1) to simulate leakage from reservoirs using the modular finite-difference ground-water flow model (MODFLOW)","language":"ENGLISH","publisher":"U.S. Geological Survey ;\r\nBranch of Information Services [distributor],","doi":"10.3133/ofr96364","issn":"0094-9140","usgsCitation":"Fenske, J., Leake, S.A., and Prudic, D.E., 1996, Documentation of a computer program (RES1) to simulate leakage from reservoirs using the modular finite-difference ground-water flow model (MODFLOW): U.S. Geological Survey Open-File Report 96-364, vi, 51 p. :ill. ;28 cm., https://doi.org/10.3133/ofr96364.","productDescription":"vi, 51 p. :ill. ;28 cm.","costCenters":[],"links":[{"id":155298,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1996/0364/report-thumb.jpg"},{"id":52404,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1996/0364/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a6ae4b07f02db63d223","contributors":{"authors":[{"text":"Fenske, J.P.","contributorId":82345,"corporation":false,"usgs":true,"family":"Fenske","given":"J.P.","email":"","affiliations":[],"preferred":false,"id":189293,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Leake, S. A.","contributorId":52164,"corporation":false,"usgs":true,"family":"Leake","given":"S.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":189292,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Prudic, David E. deprudic@usgs.gov","contributorId":3430,"corporation":false,"usgs":true,"family":"Prudic","given":"David","email":"deprudic@usgs.gov","middleInitial":"E.","affiliations":[{"id":465,"text":"Nevada Water Science Center","active":true,"usgs":true}],"preferred":true,"id":189291,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":25490,"text":"wri954046 - 1996 - Evaluation of agricultural best-management practices in the Conestoga River headwaters, Pennsylvania: Effects of nutrient management on water quality in the Little Conestoga Creek headwaters, 1983-89","interactions":[],"lastModifiedDate":"2022-01-31T21:40:02.949893","indexId":"wri954046","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"95-4046","title":"Evaluation of agricultural best-management practices in the Conestoga River headwaters, Pennsylvania: Effects of nutrient management on water quality in the Little Conestoga Creek headwaters, 1983-89","docAbstract":"Water quality in the headwaters of the Little Conestoga Creek, Lancaster County, Pa., was investigated from April 1986 through September 1989 to determine possible effects of agricultural nutrient management on water quality. Nutrient management, an agricultural Best-Management Practice, was promoted in the 5.8-square-mile watershed by the U.S. Department of Agriculture Rural Clean Water Program. Nonpoint-source- agricultural contamination was evident in surface water and ground water in the watershed; the greatest contamination was in areas underlain by carbonate rock and with intensive row-crop and animal production. Initial implementation of nutrient management covered about 30 percent of applicable land and was concentrated in the Nutrient-Management Subbasin. By 1989, nutrient management covered about 45 percent of the entire Small Watershed, about 85 percent of the Nutrient- Management Subbasin, and less than 10 percent of the Nonnutrient-Management Subbasin. The number of farms implementing nutrient management increased from 14 in 1986 to 25 by 1989. Nutrient applications to cropland in the Nutrient- Management Subbasin decreased by an average of 35 percent after implementation. Comparison of base- flow surface-water quality from before and after implementation suggests that nutrient management was effective in slowing or reversing increases in concentrations of dissolved nitrate plus nitrite in the Nutrient-Management Subbasin. Although not statistically significant, the Mann-Whitney step-trend coefficient for the Nutrient-Management Subbasin was 0.8 milligram per liter, whereas trend coefficients for the Nonnutrient-Management Subbasin and the Small Watershed were 0.4 and 1.4 milligrams per liter, respectively, for the period of study. Analysis of covariance comparison of concurrent concentrations from the two sub- basins showed a significant decrease in concen- trations from the Nutrient-Management Subbasin compared to the Nonnutrient-Management Subbasin. The small, positive effect of nutrient management on base-flow water quality should be interpreted with caution. Lack of statistical significance for most tests, short-term variation in climate and agricultural activities, unknown ground-water flow rates, and insufficient agricultural-activity data for farms outside of the Nutrient-Management Subbasin were potential problems. A regression model relating nutrient applications to concen- trations of dissolved nitrate plus nitrite showed no significant explanatory relation.","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/wri954046","usgsCitation":"Koerkle, E.H., Fishel, D.K., Brown, M.J., and Kostelnik, K.M., 1996, Evaluation of agricultural best-management practices in the Conestoga River headwaters, Pennsylvania: Effects of nutrient management on water quality in the Little Conestoga Creek headwaters, 1983-89: U.S. Geological Survey Water-Resources Investigations Report 95-4046, vi, 49 p., https://doi.org/10.3133/wri954046.","productDescription":"vi, 49 p.","costCenters":[{"id":532,"text":"Pennsylvania Water Science Center","active":true,"usgs":true}],"links":[{"id":395190,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_48162.htm"},{"id":124221,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1995/4046/report-thumb.jpg"},{"id":54212,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1995/4046/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"country":"United States","state":"Pennsylvania","otherGeospatial":"Conestoga River headwaters","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -76.93038940429686,\n 40.13899044275822\n ],\n [\n -76.90532684326172,\n 40.13899044275822\n ],\n [\n -76.90532684326172,\n 40.16798656578528\n ],\n [\n -76.93038940429686,\n 40.16798656578528\n ],\n [\n -76.93038940429686,\n 40.13899044275822\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a4be4b07f02db6258b8","contributors":{"authors":[{"text":"Koerkle, E. H.","contributorId":29853,"corporation":false,"usgs":true,"family":"Koerkle","given":"E.","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":193905,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Fishel, D. K.","contributorId":72028,"corporation":false,"usgs":true,"family":"Fishel","given":"D.","email":"","middleInitial":"K.","affiliations":[],"preferred":false,"id":193907,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Brown, M. J.","contributorId":106531,"corporation":false,"usgs":true,"family":"Brown","given":"M.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":193908,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Kostelnik, K. M.","contributorId":34951,"corporation":false,"usgs":true,"family":"Kostelnik","given":"K.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":193906,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":30291,"text":"wri964094 - 1996 - Synthesis of monthly natural flows for selected sites in the Musselshell River basin, Montana, base period 1929-89","interactions":[],"lastModifiedDate":"2012-02-02T00:08:55","indexId":"wri964094","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"96-4094","title":"Synthesis of monthly natural flows for selected sites in the Musselshell River basin, Montana, base period 1929-89","docAbstract":"Synthesized monthly natural streamflows were required at 13 sites for use in a streamflow- accounting model to evaluate the effects of various water-allocation schemes on water availability in the Musselshell River Basin in central Montana. Records of monthly streamflow at 14 streamflow-gaging stations were used to synthesize monthly natural flows at tributaries and the 13 synthesis sites. A streamflow-record extension program was used to extend flow records at the 14 gaged sites to a common base period, 1929-89. To synthesize monthly natural flows at 10 sites on the Musselshell River mainstem, synthesized monthly natural flows at all signi- ficant tributary streams were required. Results from a previous study were used to synthesize tributary natural flows. Monthly natural flows at each mainstem site downstream from the first site were synthesized by successively adding monthly natural flows from intervening tributaries to the next upstream mainstem site. Special methods using extended-record flows from gaged tributaries were used to synthesize monthly natural flows at three tributary sites. Synthesized mean annual natural flows were found to be greater than mean annual extended-record flows at three selected comparison sites on the Musselshell River. The differences between mean natural and extended-record flows (depletions) at Harlowton and Musselshell were considered to be reasonable given the amount of irrigated acreage upstream from the two sites. The differences at Mosby, the site farthest downstream, was less than at Musselshell, the next upstream site, indicating that the methods of synthesis had error. The synthesis error generally was attributed to the larger natural variability of tributary flows in the lower portion of the Musselshell River Basin.","language":"ENGLISH","publisher":"U.S. Geological Survey ;\r\nEarth Science Information Center, Open-File Reports Section [distributor],","doi":"10.3133/wri964094","usgsCitation":"Vining, K., Johnson, D., and Parrett, C., 1996, Synthesis of monthly natural flows for selected sites in the Musselshell River basin, Montana, base period 1929-89: U.S. Geological Survey Water-Resources Investigations Report 96-4094, iv, 43 p. :ill., maps ;28 cm., https://doi.org/10.3133/wri964094.","productDescription":"iv, 43 p. :ill., maps ;28 cm.","costCenters":[],"links":[{"id":159850,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1996/4094/report-thumb.jpg"},{"id":59081,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1996/4094/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e48c8e4b07f02db541e4a","contributors":{"authors":[{"text":"Vining, K.C.","contributorId":63424,"corporation":false,"usgs":true,"family":"Vining","given":"K.C.","email":"","affiliations":[],"preferred":false,"id":203000,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Johnson, D.R.","contributorId":92711,"corporation":false,"usgs":true,"family":"Johnson","given":"D.R.","email":"","affiliations":[],"preferred":false,"id":203001,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Parrett, Charles","contributorId":9635,"corporation":false,"usgs":true,"family":"Parrett","given":"Charles","email":"","affiliations":[],"preferred":false,"id":202999,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":28078,"text":"wri964024 - 1996 - Estimation of evapotranspiration in the Rainbow Springs and Silver Springs basins in North-Central Florida","interactions":[],"lastModifiedDate":"2012-02-02T00:08:26","indexId":"wri964024","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"96-4024","title":"Estimation of evapotranspiration in the Rainbow Springs and Silver Springs basins in North-Central Florida","docAbstract":"Estimates of evapotranspiration (ET) for the Rainbow and Silver Springs ground-water basins in north-central Florida were determined using a regional water-~budget approach and compared to estimates computed using a modified Priestley-Taylor (PT) model calibrated with eddy-correlation data. Eddy-correlation measurements of latent 0~E) and sensible (H) heat flux were made monthly for a few days at a time, and the PT model was used to estimate 3,E between times of measurement during the 1994 water year. A water-budget analysis for the two-basin area indicated that over a 30-year period (196594) annual rainfall was 51.7 inches. Of the annual rainfall, ET accounted for about 37.9 inches; springflow accounted for 13.1 inches; and the remaining 0.7 inch was accounted for by stream-flow, by ground-water withdrawals from the Floridan aquifer system, and by net change in storage. For the same 30-year period, the annual estimate of ET for the Silver Springs basin was 37.6 inches and was 38.5 inches for the Rainbow Springs basin. Wet- and dry-season estimates of ET for each basin averaged between nearly 19 inches and 20 inches, indicating that like rainfall, ET rates during the 4-month wet season were about twice the ET rates during the 8-month dry season. Wet-season estimates of ET for the Rainbow Springs and Silver Springs basins decreased 2.7 inches, and 3.4 inches, respectively, over the 30-year period; whereas, dry-season estimates for the basins decreased about 0.4 inch and1.0 inch, respectively, over the 30-year period. This decrease probably is related to the general decrease in annual rainfall and reduction in net radiation over the basins during the 30-year period. ET rates computed using the modified PT model were compared to rates computed from the water budget for the 1994 water year. Annual ET, computed using the PT model, was 32.0 inches, nearly equal to the ET water-budget estimate of 31.7 inches computed for the Rainbow Springs and Silver Springs basins. Modeled ET rates for 1994 ranged from 14.4 inches per year in January to 51.6 inches per year in May. Water-budget ET rates for 1994 ranged from 12.0 inches per year in March to 61.2 inches per year in July. Potential evapotranspiration rates for 1994 averaged 46.8 inches per year and ranged from 21.6 inches per year in January to 74.4 inches per year in May. Lake evaporation rates averaged 47.1 inches per year and ranged from 18.0 inches per year in January to 72.0 inches per year in May 1994.","language":"ENGLISH","publisher":"U.S. Geological Survey ;\r\nOpen-File Reports Section [distributor],","doi":"10.3133/wri964024","usgsCitation":"Knowles, L., 1996, Estimation of evapotranspiration in the Rainbow Springs and Silver Springs basins in North-Central Florida: U.S. Geological Survey Water-Resources Investigations Report 96-4024, vi, 37 p. :ill., maps ;28 cm., https://doi.org/10.3133/wri964024.","productDescription":"vi, 37 p. :ill., maps ;28 cm.","costCenters":[],"links":[{"id":125057,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1996/4024/report-thumb.jpg"},{"id":56899,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1996/4024/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a0ae4b07f02db5fb953","contributors":{"authors":[{"text":"Knowles, Leel Jr.","contributorId":14857,"corporation":false,"usgs":true,"family":"Knowles","given":"Leel","suffix":"Jr.","email":"","affiliations":[],"preferred":false,"id":199184,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":27535,"text":"wri964045 - 1996 - Postaudit of head and transmissivity estimates and ground-water flow models of Avra Valley, Arizona","interactions":[],"lastModifiedDate":"2018-12-20T09:17:21","indexId":"wri964045","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"96-4045","title":"Postaudit of head and transmissivity estimates and ground-water flow models of Avra Valley, Arizona","docAbstract":"Ground water from regional alluvial-aquifer systems is the main source of water in the alluvial basins of Arizona, such as Avra Valley. Ground-water flow models are used to assess ground-water availability and the effects of development on the regional ground-water resources. A postaudit of regional-head and transmissivity estimates and the ground-water flow models of Avra Valley was used to evaluate potential errors in the distribution of aquifer properties and recharge that can cause predictive errors in ground-water models. Simulations of predevelopment conditions in 1940 and historical development conditions for 1960-79 provided the basis of comparison for assessing predictive errors of historical conditions for two regional ground-water flow models. Potential errors in the estimation of the regional-head and transmissivity and alternate conceptual models were compared with an existing calibrated two-layer flow model for predevelopment (1940) and developed conditions (1940-85).
Measured heads can be subdivided into a north-central region and a region south of the basin constriction. A more variable regional-head surface typical of developed aquifer systems was indicated by kriged developed heads (1985) with about 50 percent more uncertainty than predevelopment heads (1940). Incorporating heads from adjacent basins at the ground-water inflow and outflow regions reduced uncertainty in kriged heads for these boundary areas. Universal cokriging of heads with the strongly correlated land-surface altitudes may improve regional-head estimates and model comparisons where head data are sparse.
Local transmissivity estimates can be subdivided into northern and south-central regions that are distributed along the valley axis and the Santa Cruz River. Regional geostatistical estimates of transmissivity, which are based solely on local estimates, are low in the northern part of Avra Valley and are high in the south-central part when compared with the head-conditioned model-derived estimates. These differences may be related to a systematic bias between aquifer-test conditions and methods of aquifer-test analysis. Cokriging transmissivities with specific capacity and silt-and-clay content provided the least uncertainty of all kriged estimates.
Predictive errors for the Avra Valley model are the result of a different combination of factors that become significant in the simulation of ground-water flow for the periods representing predevelopment, historical development, and future development conditions. Predictive errors for simulation of predevelopment conditions are caused by potential systematic errors in estimates of local transmissivity, uncertainty in long-term mountain-front recharge, and uncertainty in predevelopment heads along the margins of the basin where recharge and transmissivity estimates are constrained by heads during model calibration. Analog-model historical predictions of future development indicate changes to 1985 were as much as 50 to 100 feet different from actual declines that were caused by errors in the spatial distribution and not the total amount of estimated future pumpage.
Predictive errors for simulation of historical development (1960-79) appear to be caused to a greater extent by combined errors in estimates of transmissivity and storage properties and to a lesser extent by estimates of net withdrawal and subsidence. Comparison of the two digital models resulted in differences in transmissivity of as much as 30,000 feet squared per day and differences in specific yield of as much as 0.1. In combination with some differences in net withdrawal, these model-parameter differences resulted in local differences in change in storage of as much as 4,000 acre-feet per square mile and are equivalent to historical predictive errors in water levels of as much as 40 feet. Areas with no differences in model parameters yield comparable simulated water-level declines that are similar to measured declines. The pattern of differences in transmissivity and storage parameters are similar to differences between model-derived estimates conditioned on heads and related geostatistical estimates derived from aquifer-test estimates.
A postaudit analysis of alternate conceptual models was explored on the basis of well-by-well comparisons of reductions in mean error and variance, and through the use of standardized calibration-error maps for predevelopment heads (1940) and developed heads (1985). Calibration-error maps provide a useful tool for exploring the spatial structure of model errors and the relative adequacy of model fit that is not available from traditional methods of model comparison. Calibration-error maps indicate estimated heads were too high in the southern part of Avra Valley, and estimated heads were too low in the northern part. Increased transmissivity in the southern part of the lower model layer; decreased hydraulic conductivity in the southwestern part of the upper layer; reduced ground-water inflow from Altar Valley; and increased recharge along the Tortolita Mountains, Tucson Mountains, and Brawley Wash yielded a significantly better model for predevelopment but not for developed conditions (1940-85). This may indicate that alternate conceptual models are different for different time periods or require analysis of time-varying model parameters for developed conditions, such as climatically variable recharge. Predictive errors for future simulations (1986-2025) also could potentially include errors of more than 40 ft from omission of subsidence from the simulation of regional ground-water flow in Avra Valley. Further refinement of the changing conceptual model of an aquifer system under continuing development and variable climate, such as Avra Valley, will require a variety of additional geophysical, geochemical, and hydraulic field data.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/wri964045","collaboration":"Prepared in cooperation with the Arizona Department of Water Resources and City of Tucson","usgsCitation":"Hanson, R.T., 1996, Postaudit of head and transmissivity estimates and ground-water flow models of Avra Valley, Arizona: U.S. Geological Survey Water-Resources Investigations Report 96-4045, vi, 84 p., https://doi.org/10.3133/wri964045.","productDescription":"vi, 84 p.","costCenters":[],"links":[{"id":119780,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1996/4045/report-thumb.jpg"},{"id":56394,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1996/4045/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"country":"United States","state":"Arizona","otherGeospatial":"Avra Valley","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -111.5,\n 32\n ],\n [\n -111.25,\n 32\n ],\n [\n -111.25,\n 32.55\n ],\n [\n -111.5,\n 32.55\n ],\n [\n -111.5,\n 32\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ad5e4b07f02db683a5d","contributors":{"authors":[{"text":"Hanson, R. T.","contributorId":91148,"corporation":false,"usgs":true,"family":"Hanson","given":"R.","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":198276,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":28265,"text":"wri954029 - 1996 - Geographic relations of landslide distribution and assessment of landslide hazards in the Blanco, Cibuco, and Coamo basins, Puerto Rico","interactions":[],"lastModifiedDate":"2012-02-02T00:08:52","indexId":"wri954029","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"95-4029","title":"Geographic relations of landslide distribution and assessment of landslide hazards in the Blanco, Cibuco, and Coamo basins, Puerto Rico","docAbstract":"Landslide occurrence is common in mountainous areas of Puerto Rico where mean annual rainfall and the frequency of intense storms are high and hillslopes are steep. Each year, landslides cause extensive damage to property and occasionally result in loss of life. Landslide maps developed from 1:20,000 scale aerial photographs in combination with a computerized geographic information system were used to evaluate the landslide potential in the Blanco, Cibuco, and Coamo Basins of Puerto Rico. These basins, ranging in surface area from 276 to 350 square kilometers, are described in this report. The basins represent a broad range of the climatologic, geographic, and geologic conditions that occur in Puerto Rico. In addition, a variety of landslide types were documented. Rainfall-triggered debris flows, shallow soil slips, and slumps were most abundant. The most important temporal control on landslide occurrence in Puerto Rico is storm rainfall. Forty-one storms triggered widespread landsliding about 1 to 2 times per year during the last three decades. These storms were frequently of 1 to 2 days duration in which, on average, several hundred millimeters of rainfall triggered tens to hundreds of landslides in the central mountains. Most of these storms were tropical disturbances that occurred during the hurricane season of June through November. Land use and the topographic characteristics of hillslope angle, elevation, and aspect are the most important spatial controls governing landslide frequency. Hillslopes in the study area that have been anthropogenically modified, exceed 12 degrees in gradient and about 350 meters in elevation, and face the east-northeast are most prone to landsliding. Bedrock geology and soil order seem less important in the determination of landslide frequency, at least when considered at a generalized level. A rainfall accumulation-duration relation for the triggering of numerous landslides throughout the central mountains, and a set of simplified matrices representing geographic conditions in the three river basins were developed and are described in this report. These two elements provide a basis for the estimation of the temporal and spatial controls on landslide occurrence in Puerto Rico. Finally, this approach is an example of a relatively inexpensive technique for landslide hazard analysis that may be applicable to other settings.","language":"ENGLISH","publisher":"U.S. Dept. of the Interior, U.S. Geological Survey ;\r\nEarth Science Information Center, Open-File Reports Section [distributor],","doi":"10.3133/wri954029","usgsCitation":"Larsen, M.C., and Torres-Sanchez, A., 1996, Geographic relations of landslide distribution and assessment of landslide hazards in the Blanco, Cibuco, and Coamo basins, Puerto Rico: U.S. Geological Survey Water-Resources Investigations Report 95-4029, vi, 56 p. :ill., maps ;28 cm., https://doi.org/10.3133/wri954029.","productDescription":"vi, 56 p. :ill., maps ;28 cm.","costCenters":[],"links":[{"id":123545,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1995/4029/report-thumb.jpg"},{"id":57088,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1995/4029/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b1be4b07f02db6a904f","contributors":{"authors":[{"text":"Larsen, M. C.","contributorId":66287,"corporation":false,"usgs":true,"family":"Larsen","given":"M.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":199496,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Torres-Sanchez, A. J.","contributorId":44198,"corporation":false,"usgs":true,"family":"Torres-Sanchez","given":"A. J.","affiliations":[],"preferred":false,"id":199495,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":26364,"text":"wri964036 - 1996 - Assessment of the hydrogeology and water quality in a near-shore well field, Sarasota, Florida","interactions":[],"lastModifiedDate":"2012-02-02T00:08:33","indexId":"wri964036","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"96-4036","title":"Assessment of the hydrogeology and water quality in a near-shore well field, Sarasota, Florida","docAbstract":"The city of Sarasota, Florida, operates a downtown well field that pumps mineralized water from ground water sources to supply a reverse osmosis plant. Because of the close proximity of the well field to Sarasota Bay and the high sulfate and chloride concentrations of ground-water supplies, a growing concern exists about the possibility of lateral movement of saltwater in a landward direction (intrusion) and vertical movement of relict sea water (upconing). In 1992, the U.S. Geological Survey began a 3-year study to evaluate the hydraulic characteristics and water quality of ground-water resources within the downtown well field and the surrounding 235-square-mile study area. Delineation of the hydrogeology of the study area was based on water- quality data, aquifer test data, and extensive borehole geophysical surveys (including gamma, caliper, temperature, electrical resistivity, and flow meter logs) from the six existing production wells and from a corehole drilled as part of the study, as well as from published and unpublished reports on file at the U.S. Geological Survey, the Southwest Florida Water Management District, and consultant's reports. Water-quality data were examined for spatial and temporal trends that might relate to the mechanism for observed water-quality changes. Water quality in the study area appears to be dependent upon several mechanisms, including upconing of higher salinity water from deeper zones within the aquifer system, interbore-hole flow between zones of varying water quality through improperly cased and corroded wells, migration of highly mineralized waters through structural deformities, and the presence of unflushed relict seawater. A numerical ground-water flow model was developed as an interpretative tool where field-derived hydrologic characteristics could be tested. The conceptual model consisted of seven layers to represent the multilayered aquifer systems underlying the study area. Particle tracking was utilized to delineate the travel path of water as it enters the model area under a set of given conditions. Within the model area, simulated flow in the intermediate aquifer system originates primarily from the northwestern boundary. Simulated flow in the Upper Floridan aquifer originates in lower model layers (deeper flow zones) and ultimately can be traced to the southeastern and northwestern boundaries. Volumetric budgets calculated from numerical simulation of a hypothetical well field indicate that the area of contribution to the well field changes seasonally. Although ground-water flow patterns change with wet and dry seasons, most water enters the well-field flow system through lower parts of the Upper Floridan aquifer from a southeastern direction. Moreover, particle tracking indicated that ground-water flow paths with strictly lateral pathlines in model layers correspond to the intermediate aquifer system, whereas particles traced through model layers corresponding to the Upper Floridan aquifer had components of vertical and lateral flow.","language":"ENGLISH","publisher":"U.S. Geological Survey ;\r\nOpen-File Reports Section [distributor],","doi":"10.3133/wri964036","usgsCitation":"Broska, J.C., and Knochenmus, L.A., 1996, Assessment of the hydrogeology and water quality in a near-shore well field, Sarasota, Florida: U.S. Geological Survey Water-Resources Investigations Report 96-4036, vi, 64 p. :ill., maps ;28 cm., https://doi.org/10.3133/wri964036.","productDescription":"vi, 64 p. :ill., maps ;28 cm.","costCenters":[],"links":[{"id":124358,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1996/4036/report-thumb.jpg"},{"id":55158,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1996/4036/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4aafe4b07f02db66cf43","contributors":{"authors":[{"text":"Broska, J. C.","contributorId":62628,"corporation":false,"usgs":true,"family":"Broska","given":"J.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":196261,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Knochenmus, L. A.","contributorId":60683,"corporation":false,"usgs":true,"family":"Knochenmus","given":"L.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":196260,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":28747,"text":"wri954133 - 1996 - Simulated effects of alternative withdrawal strategies on ground-water-flow patterns, New Jersey Pinelands","interactions":[],"lastModifiedDate":"2012-02-02T00:08:46","indexId":"wri954133","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"95-4133","title":"Simulated effects of alternative withdrawal strategies on ground-water-flow patterns, New Jersey Pinelands","docAbstract":"A steady-state, three-dimensional ground-water- flow model of the unconfined part of the Kirkwood- Cohasey aquifer system beneath the upper parts of the Rancocas Creek and Wading River Basins in the New Jersey Pinelands was developed to (1) define ground-water-flow patterns and residence times in an aquifer system typical of the New Jersey Coastal Plain and (2) demonstrate the effects of alternative withdrawal strategies of ground- water-flow patterns and streams. Ground-water flow near the McDonald's-Middle Branch area was analyzed by using a particle tracker to demonstrate the effects of three hypothetical withdrawal scenarios on the configurations of source areas of ground-water flow to withdrawal wells, streams, and other discharge outlets in the Kirkwood-Cohansey aquifer system. Under natural conditions, most ground-water discharge to streams and wetlands. Ground-water residence times ranged from slightly greater than zero to about 200 years. Much of the ground water remained in the system for less than 20 years because it discharged to streams. Residence times of ground water were reduced significantly by persistent withdrawals. The configurations of source areas of flow to local stream systems and to the Piney Point aquifer are affected by the location of a withdrawal well. Results of withdrawal simulations indicate that well-location strategies applied in the Kirkwood-Cohansey aquifer system can alleviate the adverse effects of withdrawals on streams and that large-scale regional withdrawals in confined aquifers can adversely effect streams although the effects are dispersed over numerous streams.","language":"ENGLISH","publisher":"U.S. Geological Survey ;\r\nEarth Science Information Center, Open-File Reports Section [distributor],","doi":"10.3133/wri954133","usgsCitation":"Modica, E., 1996, Simulated effects of alternative withdrawal strategies on ground-water-flow patterns, New Jersey Pinelands: U.S. Geological Survey Water-Resources Investigations Report 95-4133, vi, 46 p. :ill., maps ;28 cm., https://doi.org/10.3133/wri954133.","productDescription":"vi, 46 p. :ill., maps ;28 cm.","costCenters":[],"links":[{"id":159186,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1995/4133/report-thumb.jpg"},{"id":57596,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1995/4133/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e49aee4b07f02db5c7b0c","contributors":{"authors":[{"text":"Modica, Edward","contributorId":59431,"corporation":false,"usgs":true,"family":"Modica","given":"Edward","email":"","affiliations":[],"preferred":false,"id":200330,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":30304,"text":"wri954280 - 1996 - Evaluation of saltwater intrusion and travel time in the Atlantic City 800-foot sand, Cape May County, New Jersey, 1992, by use of a coupled-model approach and flow-path analysis","interactions":[],"lastModifiedDate":"2023-01-16T16:12:56.339634","indexId":"wri954280","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"95-4280","title":"Evaluation of saltwater intrusion and travel time in the Atlantic City 800-foot sand, Cape May County, New Jersey, 1992, by use of a coupled-model approach and flow-path analysis","docAbstract":"Regional and subregional ground-water-flow models were coupled, and the output was analyzed by a particle-tracking method. The results were then used to assess the effects of ground-water withdrawals on the flow of saltwater in the Atlantic City 800-foot sand in Cape May County, New Jersey, and to estimate the travel time from areas in which the chloride concentration of the ground water exceeds 250 milligrams per liter to the county's nearest public supply wells.
First, a quasi-three-dimensional finite-difference computer model of freshwater and saltwater flow that simulated regional ground-water flow through the unconsolidated materials underlying the New Jersey Coastal Plain was used to estimate flow at the boundaries of the subregional study area. The results of the regional simulation were used as input to a second quasi-three-dimensional finite-difference model that was used to simulate flow in the subregion, the Atlantic City 800-foot sand in Cape May County.
The results of the simulation of flow in the subregion were analyzed by a semianalytical particle-tracking method to estimate ground-water flow paths and travel time of ground water from areas in which chloride concentrations exceed 250 milligrams per liter to public supply wells located at Stone Harbor, New Jersey. Ground-water withdrawals from the Atlantic City 800-foot sand were assumed to be equal to those reported for 1991. Results of the analysis indicate that the time required for saltwater to reach the public supply wells is on the order of hundreds of years. These results, however, are based on the assumptions that the aquifer is homogeneous. The presence of zones of high permeability in the aquifer could reduce the predicted travel times of the saltwater from its present location to the supply wells. Travel times also could be reduced if ground-water withdrawals increase.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/wri954280","usgsCitation":"Voronin, L., Spitz, F., and McAuley, S.D., 1996, Evaluation of saltwater intrusion and travel time in the Atlantic City 800-foot sand, Cape May County, New Jersey, 1992, by use of a coupled-model approach and flow-path analysis: U.S. Geological Survey Water-Resources Investigations Report 95-4280, v, 27 p., https://doi.org/10.3133/wri954280.","productDescription":"v, 27 p.","costCenters":[],"links":[{"id":121457,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1995/4280/report-thumb.jpg"},{"id":59096,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1995/4280/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":411927,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_48354.htm","linkFileType":{"id":5,"text":"html"}}],"country":"United States","state":"New Jersey","county":"Cape May County","otherGeospatial":"Atlantic City 800-food sand","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -74.42797298136729,\n 39.34792038176417\n ],\n [\n -75.00347317734072,\n 39.34792038176417\n ],\n [\n -75.00347317734072,\n 38.88453727742365\n ],\n [\n -74.42797298136729,\n 38.88453727742365\n ],\n [\n -74.42797298136729,\n 39.34792038176417\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a09e4b07f02db5fabae","contributors":{"authors":[{"text":"Voronin, L. M.","contributorId":93486,"corporation":false,"usgs":true,"family":"Voronin","given":"L. M.","affiliations":[],"preferred":false,"id":203023,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Spitz, F. J.","contributorId":56682,"corporation":false,"usgs":true,"family":"Spitz","given":"F. J.","affiliations":[],"preferred":false,"id":203022,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"McAuley, S. D.","contributorId":104098,"corporation":false,"usgs":true,"family":"McAuley","given":"S.","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":203024,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":29311,"text":"wri964143 - 1996 - Time-dependent Data System (TDDS); an interactive program to assemble, manage, and appraise input data and numerical output of flow/transport simulation models","interactions":[],"lastModifiedDate":"2012-02-02T00:08:51","indexId":"wri964143","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"96-4143","title":"Time-dependent Data System (TDDS); an interactive program to assemble, manage, and appraise input data and numerical output of flow/transport simulation models","docAbstract":"A system of functional utilities and computer routines, collectively identified as the Time-Dependent Data System CI DDS), has been developed and documented by the U.S. Geological Survey. The TDDS is designed for processing time sequences of discrete, fixed-interval, time-varying geophysical data--in particular, hydrologic data. Such data include various, dependent variables and related parameters typically needed as input for execution of one-, two-, and three-dimensional hydrodynamic/transport and associated water-quality simulation models. Such data can also include time sequences of results generated by numerical simulation models. Specifically, TDDS provides the functional capabilities to process, store, retrieve, and compile data in a Time-Dependent Data Base (TDDB) in response to interactive user commands or pre-programmed directives. Thus, the TDDS, in conjunction with a companion TDDB, provides a ready means for processing, preparation, and assembly of time sequences of data for input to models; collection, categorization, and storage of simulation results from models; and intercomparison of field data and simulation results. The TDDS can be used to edit and verify prototype, time-dependent data to affirm that selected sequences of data are accurate, contiguous, and appropriate for numerical simulation modeling. It can be used to prepare time-varying data in a variety of formats, such as tabular lists, sequential files, arrays, graphical displays, as well as line-printer plots of single or multiparameter data sets. The TDDB is organized and maintained as a direct-access data base by the TDDS, thus providing simple, yet efficient, data management and access. A single, easily used, program interface that provides all access to and from a particular TDDB is available for use directly within models, other user-provided programs, and other data systems. This interface, together with each major functional utility of the TDDS, is described and documented in this report.","language":"ENGLISH","publisher":"U.S. Geological Survey ;\r\nBranch of Information Services [distributor],","doi":"10.3133/wri964143","usgsCitation":"Regan, R., Schaffranek, R., and Baltzer, R., 1996, Time-dependent Data System (TDDS); an interactive program to assemble, manage, and appraise input data and numerical output of flow/transport simulation models: U.S. Geological Survey Water-Resources Investigations Report 96-4143, vii, 104 p. :ill. ;28 cm., https://doi.org/10.3133/wri964143.","productDescription":"vii, 104 p. :ill. ;28 cm.","costCenters":[],"links":[{"id":159581,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1996/4143/report-thumb.jpg"},{"id":58156,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1996/4143/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a53e4b07f02db62b5e3","contributors":{"authors":[{"text":"Regan, R.S.","contributorId":51794,"corporation":false,"usgs":true,"family":"Regan","given":"R.S.","email":"","affiliations":[],"preferred":false,"id":201325,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Schaffranek, R.W.","contributorId":61468,"corporation":false,"usgs":true,"family":"Schaffranek","given":"R.W.","affiliations":[],"preferred":false,"id":201326,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Baltzer, R.A.","contributorId":86321,"corporation":false,"usgs":true,"family":"Baltzer","given":"R.A.","email":"","affiliations":[],"preferred":false,"id":201327,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":28372,"text":"wri954201 - 1996 - Availability and quality of water from drift aquifers in Marshall, Pennington, Polk, and Red Lake counties, northwestern Minnesota","interactions":[],"lastModifiedDate":"2018-03-12T13:11:07","indexId":"wri954201","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"95-4201","title":"Availability and quality of water from drift aquifers in Marshall, Pennington, Polk, and Red Lake counties, northwestern Minnesota","docAbstract":"Sand and gravel aquifers present within glacial deposits are important sources of water in Marshall, Pennington, Polk, and Red Lake Counties in northwestern Minnesota. Saturated thicknesses of the unconfined aquifers range from 0 to 30 feet. Estimated horizontal hydraulic conductivities range from 2.5 to 600 feet per day. Transmissivity of the unconfined aquifers ranges from 33 to greater than 3,910 feet squared per day. Theoretical maximum well yields for 6 wells with specific-capacity data range from 12 to 123 gallons per minute.
\nSaturated thicknesses of shallow confined aquifers (depth to top of the aquifer less than 100 feet below land surface) range from 0 to 150 feet. Thicknesses of intermediate, deep, and basal confined aquifers (depths to top of the aquifer from 100 to 199 feet, from 200 to 299 feet, and 300 feet or more below land surface, respectively) range from 0 to more than 126 feet. Transmissivity of the confined aquifers ranges from 2 to greater than 210,000 feet squared per day. Theoretical maximum well yields range from 3 to about 2,000 gallons per minute.
\nRecharge to ground water is predominantly from precipitation that percolates downward to the saturated zone. Recharge to unconfined aquifers in the study area ranged from 4.5 to 12.0 inches per year during 1991 and 1992, based on hydrograph analysis. Model simulations done for this study indicate that recharge rates from 8 to 9 inches per year to unconfined aquifers produce the best matches between model-simulated and measured water levels in wells.
\nDischarge from ground water occurs by seepage to streams, lakes and wetlands, ground-water evapotranspiration, and withdrawals through wells. In 1990, total ground-water withdrawals in the study area were 6.0 million gallons per day. All of the withdrawals were from drift aquifers.
\nNumerical models of ground-water flow were constructed to represent two beach-ridge aquifer systems under steady-state conditions. Beach-ridge aquifer systems were simulated in Pennington, Polk, and Red Lake County. Simulated recharge from the infiltration of precipitation accounts for most of the sources of water to the beach-ridge aquifer systems and simulated evapotranspiration accounts for all of the discharge other than ground-water withdrawals. The numerical-model simulations indicate that upward movement of water from underlying confined aquifers to overlying unconfined aquifers is an important component of ground-water flow within the beach-ridge aquifer systems. Simulated long-term, steady-state yields from the unconfined aquifers are generally less than 50 gallons per minute, due to the generally low saturated thickness of the aquifers and the relatively low hydraulic conductivity of the aquifer material.
\nWater from all the drift aquifers in the study area is very hard (more than 180 milligrams per liter of calcium carbonate). The predominant ions in water from the unconfined and shallow confined aquifers were generally calcium and bicarbonate. Water from the intermediate confined aquifers includes a variety of water types, including calcium bicarbonate, calcium sulfate, mixed calcium-sodium bicarbonate, and sodium chloride type waters. Waters from the deep confined aquifers are predominantly calcium bicarbonate, mixed calcium-sodium bicarbonate, and sodium chloride type waters.
\nMean concentrations of calcium and magnesium generally decreased with depth below land surface. Mean concentrations of sodium and sulfate generally increased with depth. Mean chloride concentrations were greatest for the shallow and deep confined aquifers and least for the unconfined and intermediate confined aquifers.
\nThe concentration and percentage (as percent of total cations) of sodium, and concentration of dissolved solids tend to increase from east to west along regional flow paths. Concentrations and percentages (as percent of total anions) of chloride tend to be greater in the western part of the study area than in the eastern part. These trends are probably due to longer residence time of the water in the flow system, and upward leakage of water from the underlying Cretaceous and Paleozoic strata.
\nWaters from the drift aquifers underlying most of the study area generally are suitable for domestic consumption, crop irrigation, and most other uses. Water from 20 wells screened in unconfined and confined aquifers exceeded U.S. Environmental Protection Agency recommended limits for dissolved solids concentrations. Chemical analyses of waters from the unconfined and confined aquifers generally indicated a potentially low sodium hazard and a medium to high salinity hazard for irrigation.
\nWater samples analyzed for nitrate had nitrate concentrations below the reporting limit (0.05 milligrams per liter) in 10 out of 23 wells. Two samples had nitrate concentrations greater than 10 milligrams per liter. Pesticide concentrations in water samples from 17 wells screened in unconfined and shallow confined aquifers were below or only slightly above laboratory reporting limits.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Mounds View, MN","doi":"10.3133/wri954201","collaboration":"Prepared in cooperation with the Minnesota Department of Natural Resources and the Northwest Minnesota Ground-Water Study Steering Committee","usgsCitation":"Lindgren, R.J., 1996, Availability and quality of water from drift aquifers in Marshall, Pennington, Polk, and Red Lake counties, northwestern Minnesota: U.S. Geological Survey Water-Resources Investigations Report 95-4201, x, 144 p., https://doi.org/10.3133/wri954201.","productDescription":"x, 144 p.","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":392,"text":"Minnesota Water Science 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R. J.","contributorId":70808,"corporation":false,"usgs":true,"family":"Lindgren","given":"R.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":199689,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":28601,"text":"wri954068 - 1996 - Surface-water hydrology and runoff simulations for three basins in Pierce County, Washington","interactions":[],"lastModifiedDate":"2023-01-18T22:44:15.196335","indexId":"wri954068","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"95-4068","title":"Surface-water hydrology and runoff simulations for three basins in Pierce County, Washington","docAbstract":"The surface-water hydrology in Clear, Clarks, and Clover Creek Basins in central Pierce County, Washington, is described with a conceptual model of the runoff processes and then simulated with the Hydrological Simulation Program-FORTRAN (HSPF), a continuous, deterministic hydrologic model. The study area is currently undergoing a rapid conversion of rural, undeveloped land to urban and suburban land that often changes the flow characteristics of the streams that drain these lands. The complex interactions of land cover, climate, soils, topography, channel characteristics, and ground- water flow patterns determine the surface-water hydrology of the study area and require a complex numerical model to assess the impact of urbanization on streamflows. The U.S. Geological Survey completed this investigation in cooperation with the Storm Drainage and Surface Water Management Utility within the Pierce County Department of Public Works to describe the important rainfall-runoff processes within the study area and to develop a simulation model to be used as a tool to predict changes in runoff characteristics resulting from changes in land use. The conceptual model, a qualitative representation of the study basins, links the physical characteristics to the runoff process of the study basins. The model incorporates 11 generalizations identified by the investigation, eight of which describe runoff from hillslopes, and three that account for the effects of channel characteristics and ground-water flow patterns on runoff. Stream discharge was measured at 28 sites and precipitation was measured at six sites for 3 years in two overlapping phases during the period of October 1989 through September 1992 to calibrate and validate the simulation model. Comparison of rainfall data from October 1989 through September 1992 shows the data-collection period beginning with 2 wet water years followed by the relatively dry 1992 water year. Runoff was simulated with two basin models-the Clover Creek Basin model and the Clear-Clarks Basin model-by incorporating the generalizations of the conceptual model into the construction of two HSPF numerical models. Initially, the process-related parameters for runoff from glacial-till hillslopes were calibrated with numerical models for three catchment sites and one headwater basin where streamflows were continuously measured and little or no influence from ground water, channel storage, or channel losses affected runoff. At one of the catchments soil moisture was monitored and compared with simulated soil moisture. The values for these parameters were used in the basin models. Basin models were calibrated to the first year of observed streamflow data by adjusting other parameters in the numerical model that simulated channel losses, simulated channel storage in a few of the reaches in the headwaters and in the floodplain of the main stem of Clover Creek, and simulated volume and outflow of the ground-water reservoir representing the regional ground-water aquifers. The models were run for a second year without any adjustments, and simulated results were compared with observed results as a measure of validation of the models. The investigation showed the importance of defining the ground-water flow boundaries and demonstrated a simple method of simulating the influence of the regional ground-water aquifer on streamflows. In the Clover Creek Basin model, ground-water flow boundaries were used to define subbasins containing mostly glacial outwash soils and not containing any surface drainage channels. In the Clear-Clarks Basin model, ground-water flow boundaries outlined a recharge area outside the surface-water boundaries of the basin that was incorporated into the model in order to provide sufficient water to balance simulated ground-water outflows to the creeks. A simulated ground-water reservoir used to represent regional ground-water flow processes successfully provided the proper water balance of inflows and outfl","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/wri954068","usgsCitation":"Mastin, M.C., 1996, Surface-water hydrology and runoff simulations for three basins in Pierce County, Washington: U.S. Geological Survey Water-Resources Investigations Report 95-4068, vi, 148 p., https://doi.org/10.3133/wri954068.","productDescription":"vi, 148 p.","costCenters":[],"links":[{"id":412050,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_48178.htm","linkFileType":{"id":5,"text":"html"}},{"id":57430,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1995/4068/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":159103,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1995/4068/report-thumb.jpg"}],"country":"United States","state":"Washington","county":"Pierce County","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -122.25,\n 47.025\n ],\n [\n -122.25,\n 47.2111\n ],\n [\n -122.5,\n 47.2111\n ],\n [\n -122.5,\n 47.025\n ],\n [\n -122.25,\n 47.025\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ae5e4b07f02db68a6f2","contributors":{"authors":[{"text":"Mastin, M. C.","contributorId":90782,"corporation":false,"usgs":true,"family":"Mastin","given":"M.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":200096,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":29467,"text":"wri964124 - 1996 - Methods for estimating low-flow characteristics of ungaged streams in selected areas, northern Florida","interactions":[],"lastModifiedDate":"2025-07-21T16:49:43.32201","indexId":"wri964124","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"96-4124","title":"Methods for estimating low-flow characteristics of ungaged streams in selected areas, northern Florida","docAbstract":"Methods for estimating low-flow frequency characteristics at ungaged sites were developed for two areas in northern Florida. In the Yellow, Blackwater, Escambia, and Perdido River Basins study area (northwestern Florida), regional regression equations were developed for estimating the 7- and 30-day, 2- and 10-year low-flow characteristic (Q7,2, Q7,10, Q30,2, and Q30,10) by determining values of basin characteristics from digital Geographical Information System (GIS) coverages or hardcopy maps. A GIS, ARC-INFO, was used to quantify basin characteristics that were used in regression equations. Sources of digital data used in this analysis are elevation data, from a digital elevation model, stream length and location data from a digital hydrography coverage, and watershed boundaries digitized from topographic maps.
The most accurate regression equations employed a basin characteristic that was based on a simple conceptual model of one- dimensional ground-water flow using Darcy's law. Slightly less accurate equations were obtained using drainage area as the only explanatory variable. The standard error of prediction for the Darcy and drainage area equations of Q7,2 was 65 and 74 percent, respectively; Q7,10, 58 and 62 percent, respectively; Q30,2, 51 and, 54 percent, respectively; and Q30,10, 44 and 51 percent, respectively. In the Santa Fe River Basin study area (northeastern Florida), a flow-routing method was used to estimate low-flow characteristics at ungaged sites from low stream- flow analyses based on records at gaged sites. The use of the flow-routing method is suggested for areas where regression analysis proves unsuccessful, where low-flow characteristics have been defined at a significant number of sites, and where information about the basin characteristics has been thoroughly researched. Low-flow frequency characteristics determined at 40 sites and measurements made during five synoptic runs in 1989-91 were used to develop a flow-routing method.
Low-flow frequency characteristics and drainage areas were used to define river profiles for major streams within the Santa Fe River Basin. These river profiles serve as indicators of changes in a stream's low-flow characteristics with respect to change in drainage area. Unit low flows were also determined for each site where low-flow characteristics were determined. Areas of zero flow were defined for Q7,2 and Q7,10 conditions based on measurements made during synoptic runs and from low-flow frequency analyses.
The flow-routing method uses the drainage areas to interpolate low-flow values between or near gaged sites on the same stream. Low-flow values are transferred from a gaged site, either upstream or downstream, to the ungaged site. A step-by-step process for flow routing must be made when tributary or other inflow enter a stream. The strength of the flow-routing method is that the values at gaged sites reflect the overall basin characteristics in the vicinity of the gaged sites. However, the accuracy of low-flow estimates may be less in areas of decreasing and increasing flow if sufficient data are not available to assess changing hydraulic and hydrologic conditions.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/wri964124","usgsCitation":"Rumenik, R.P., and Grubbs, J.W., 1996, Methods for estimating low-flow characteristics of ungaged streams in selected areas, northern Florida: U.S. Geological Survey Water-Resources Investigations Report 96-4124, v, 28 p., https://doi.org/10.3133/wri964124.","productDescription":"v, 28 p.","costCenters":[],"links":[{"id":159309,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1996/4124/report-thumb.jpg"},{"id":492642,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1996/4124/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"country":"United States","state":"Florida","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -87.57202148437499,\n 29.430029404571762\n ],\n [\n -81.090087890625,\n 29.430029404571762\n ],\n [\n -81.090087890625,\n 30.977609093348686\n ],\n [\n -87.57202148437499,\n 30.977609093348686\n ],\n [\n -87.57202148437499,\n 29.430029404571762\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a51e4b07f02db62a1f9","contributors":{"authors":[{"text":"Rumenik, Roger P.","contributorId":42626,"corporation":false,"usgs":true,"family":"Rumenik","given":"Roger","email":"","middleInitial":"P.","affiliations":[],"preferred":false,"id":201568,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Grubbs, J. W.","contributorId":77139,"corporation":false,"usgs":true,"family":"Grubbs","given":"J.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":201569,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":27419,"text":"wri964096 - 1996 - Eutrophication trends inferred from hypolimnetic dissolved-oxygen dynamics within selected White River reservoirs, northern Arkansas-southern Missouri, 1974-94","interactions":[],"lastModifiedDate":"2012-02-02T00:08:37","indexId":"wri964096","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"96-4096","title":"Eutrophication trends inferred from hypolimnetic dissolved-oxygen dynamics within selected White River reservoirs, northern Arkansas-southern Missouri, 1974-94","docAbstract":"The White River Basin in northern Arkansas and southern Missouri contains four major reservoirs. Beaver, Table Rock, and Bull Shoals Lakes form a chain of reservoirs on the main stem of the White River. Norfork Lake is on the North Fork River, a tributary of the White River. Vertical water- column profiles of temperature and dissolved- oxygen concentrations have been collected monthly, in general, at sites near the dam of each reservoir since 1974. Hypolimnetic dissolved- oxygen dynamics of these reservoirs from 1974 through 1994 were examined based on the near-dam data and used to infer temporal changes in eutrophication. Regression models indicated that a positive relation existed between discharge through the dam during the stratification season and the areal hypolimnetic deficit. Temporal changes in the relative areal hypolimnetic oxygen deficit, a model that adjusts the areal hypolimnetic oxygen deficit to standard temperature and depth, showed a decreasing trend in Beaver Lake from 1974 through 1994, indicating that the level of eutrophication decreased. Little or no change in the relative areal hypolimnetic oxygen deficit occurred in Table Rock, Bull Shoals, or Norfork Lakes over the period of record. Temporal analysis of the residuals from the oxygen deficit-discharge model indicated that the oxygen deficit-discharge function changed over time in Beaver and Table Rock Lakes. There was little or no temporal trend in residuals of areal hypolimnetic oxygen deficit over the period of record for Bull Shoals and Norfork Lakes. Multiple regression using a time variable and discharge through the dam during the stratification season was examined for the four reservoirs. The slope coefficient of the time variable for both Beaver and Table Rock Lakes was negative, indicating that the temporal function driving the discharge related areal hypolimnetic oxygen deficit decreased over the period of record. This temporal function may be an expression of biological productivity or eutrophication. Based on these results, the level of eutrophication may have decreased in Beaver and Table Rock Lakes and remained stable in Bull Shoals and Norfork Lakes from 1974 through 1994. It is possible that the aging and evolutionary processes in Beaver, Table Rock, Bull Shoals, and Norfork Lakes are dominant in controlling biological productivity and eutrophication in each reservoir immediately above the dam. Beaver Lake is the youngest of the four reservoirs, constructed in 1963, and for the period of record, may have been in the initial stage of high productivity followed by a declining stage of productivity that generally occurs within a reservoir soon after impoundment. Table Rock Lake was constructed in 1959 and, for the period of record, may have been in the stage of declining productivity following the peak of productivity resulting from impoundment. The impoundment of Beaver Lake upstream also may have influenced the inferred decline of productivity within Table Rock Lake. Bull Shoals and Norfork Lakes are older than Beaver and Table Rock Lakes, constructed in 1951 and 1944, respectively. The reason that changes in eutrophication were not detected in Bull Shoals and Norfork Lakes could be that these reservoirs, for the period of record, were characterized by the stage of low and stable productivity that generally occurs within a reservoir many years after impoundment.","language":"ENGLISH","publisher":"U.S. Geological Survey ;\r\nEarth Science Information Center [distributor],","doi":"10.3133/wri964096","usgsCitation":"Green, W.R., 1996, Eutrophication trends inferred from hypolimnetic dissolved-oxygen dynamics within selected White River reservoirs, northern Arkansas-southern Missouri, 1974-94: U.S. Geological Survey Water-Resources Investigations Report 96-4096, iv, 22, A-41 p. :ill., map ;28 cm., https://doi.org/10.3133/wri964096.","productDescription":"iv, 22, A-41 p. :ill., map ;28 cm.","costCenters":[],"links":[{"id":124974,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1996/4096/report-thumb.jpg"},{"id":56277,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1996/4096/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a54e4b07f02db62c2d6","contributors":{"authors":[{"text":"Green, W. R.","contributorId":68354,"corporation":false,"usgs":true,"family":"Green","given":"W.","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":198084,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":29891,"text":"wri964041 - 1996 - Hydrologic feasibility of water-supply-development alternatives in Cape May County, New Jersey","interactions":[],"lastModifiedDate":"2012-02-02T00:08:54","indexId":"wri964041","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"96-4041","title":"Hydrologic feasibility of water-supply-development alternatives in Cape May County, New Jersey","docAbstract":"Increasing public-supply withdrawals in Cape May County, New Jersey associated with increasing residential and seasonal tourist populations have led to regionally lowered ground-water levels, a reversal of ground-water flow directions toward onshore, and landward encroachment of saltwater in the shallow aquifer system. The three aquifers composing the shallow system are, in order of increasing depth, the unconfined Holly Beach water-bearing zone and the confined estuarine sand and Cohansey aquifers. The changes to the ground-water system have been greatest in the confined aquifers near the three major well fields on the Cape May peninsula. Formerly productive water-supply wells have been abandoned because of saltwater contamination. Concern about anthropogenic contamination has prevented shifting of withdrawals to the unconfined aquifer. Surface- water sources have also been little used. Further development on the peninsula involving increased water demand will exacerbate the current saltwater-encroachment problems. The purpose of this study was to test the feasibility of possible water-supply-development alternatives by use of predictive ground-water flow simulations. The alternatives involve (1) injection of tertiary- treated wastewater to replenish aquifer storage and create a hydraulic barrier to saltwater encroachment, (2) withdrawal of brackish water in order to create a hydraulic barrier, (3) conjunctive use of ground water and surface water, enabling the reduction of ground-water withdrawals, and (4) redistribution of withdrawals inland to the unconfined aquifer. Results of these simulations can potentially be used in the design of a water-supply-development strategy that preserves supply and a monitoring program that ensures early warning of saltwater encroachment, thereby allowing sufficient time for development of an alternative supply. The water-supply- development alternatives were evaluated by comparison of results of predictive simulations made with a previously calibrated ground-water flow model of the shallow aquifer system. The quasi-three-dimensional sharp-interface model was calibrated to 1988 annual average hydrologic conditions. The planning period for the predictive simulations is 1989-2049. For the planning period, total public-supply withdrawals were increased 100 percent over average 1983-88 withdrawals. Results of a baseline simulation involving only the increased withdrawals were compared to each of the simulated alternatives, which also include the withdrawals. Hydraulic heads, saltwater- freshwater interface movement, and ground-water flows were compared. Simulation results indicate that the barrier-injection or barrier-withdrawal scheme could be useful in managing the water supply for a specific location. The conjunctive- use scheme would provide a marginal regional hydrologic benefit. Redistribution of withdrawals appears to be the only regional alternative that would result in recovery of ground-water levels and would substantially slow saltwater encroachment; however, anthropogenic land-surface contamination of the unconfined aquifer would have to be considered if the redistribution alternative is acted upon.","language":"ENGLISH","publisher":"U.S. Geological Survey ;\r\nEarth Science Information Center, Open-File Reports Section [distributor],","doi":"10.3133/wri964041","usgsCitation":"Spitz, F., 1996, Hydrologic feasibility of water-supply-development alternatives in Cape May County, New Jersey: U.S. Geological Survey Water-Resources Investigations Report 96-4041, v, 42 p. :ill., maps ;28 cm., https://doi.org/10.3133/wri964041.","productDescription":"v, 42 p. :ill., maps ;28 cm.","costCenters":[],"links":[{"id":125060,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1996/4041/report-thumb.jpg"},{"id":58708,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1996/4041/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a1ae4b07f02db606b46","contributors":{"authors":[{"text":"Spitz, F. J.","contributorId":56682,"corporation":false,"usgs":true,"family":"Spitz","given":"F. J.","affiliations":[],"preferred":false,"id":202309,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":28335,"text":"wri954188 - 1996 - Summary of the San Juan structural basin regional aquifer-system analysis, New Mexico, Colorado, Arizona, and Utah","interactions":[],"lastModifiedDate":"2012-02-02T00:08:38","indexId":"wri954188","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"95-4188","title":"Summary of the San Juan structural basin regional aquifer-system analysis, New Mexico, Colorado, Arizona, and Utah","docAbstract":"Ground-water resources are the only source of water in most of \r\nthe San Juan structural basin and are mainly used for municipal, \r\nindustrial, domestic, and stock purposes. Industrial use increased \r\ndramatically during the late 1970's and early 1980's because of \r\nincreased exploration and development of uranium and coal resources.\r\n\r\n The San Juan structural basin is a northwest-trending, \r\nasymmetric structural depression at the eastern edge of the Colorado \r\nPlateau. The basin contains as much as 14,000 feet of sedimentary \r\nrocks overlying a Precambrian basement complex. The sedimentary \r\nrocks dip basinward from the basin margins toward the troughlike \r\nstructural center, or deepest part of the basin. Rocks of Triassic \r\nage were selected as the lower boundary for the study. The basin is \r\nwell defined by structural boundaries in many places with structural \r\nrelief of as much as 20,000 feet reported. Faulting is prevalent in \r\nparts of the basin with displacement of several thousand feet along \r\nmajor faults.\r\n\r\n The regional aquifers in the basin generally are coincident with \r\nthe geologic units that have been mapped. Data on the hydrologic \r\nproperties of the regional aquifers are minimal. Most data were \r\ncollected on those aquifers associated with uranium and coal \r\nresource production. These data are summarized in table format in \r\nthe report. The regional flow system throughout most of the basin \r\nhas been affected by the production of oil or gas and subsequent \r\ndisposal of produced brine. To date more than 26,000 oil- or gas-\r\ntest holes have been drilled in the basin, the majority penetrating \r\nno deeper than the bottom of the Cretaceous rocks. \r\n\r\n The general water chemistry of the regional aquifers is based on \r\navailable data. The depositional environments are the major factor \r\ncontrolling the quality of water in the units. The dominant ions are \r\ngenerally sodium, bicarbonate, and sulfate. A detailed geochemical \r\nstudy of three sandstone aquifers--Morrison, Dakota, and Gallup--was \r\nundertaken in the northwestern part of the study area. Results of \r\nthis study indicate that water chemistry changed in individual wells \r\nover short periods of time, not expected in a regional flow system. \r\nThe chemistry of the water is affected by mixing of recharge, ion \r\nfiltrate, or very dilute ancient water, and by leakage of saline \r\nwater.\r\n\r\n The entire system of ground-water flow and its controlling \r\nfactors has been defined as the conceptual model. A steady-state, \r\nthree-dimensional ground-water flow model was constructed to \r\nsimulate modern predevelopment flow in the post-Jurassic rocks of \r\nthe regional flow system. In the ground-water flow model, 14 \r\ngeologic units or combinations of geologic units were considered to \r\nbe regional aquifers, and 5 geologic units or combinations of \r\ngeologic units were considered to be regional confining units. The \r\nmodel simulated flow in 12 layers (hydrostratigraphic units) and \r\nused harmonic-mean vertical leakance to indirectly simulate aquifer \r\nconnection across 3 other hydrostratigraphic confining units in \r\naddition to coupling the 12 units.","language":"ENGLISH","publisher":"U.S. Dept. of the Interior, U.S. Geological Survey, [Water Resources Division, New Mexico District] ;\r\nCan be purchased from U.S.G.S., Earth Science Information Center, Open-File Reports Section,","doi":"10.3133/wri954188","usgsCitation":"Levings, G.W., Kernodle, J.M., and Thorn, C.R., 1996, Summary of the San Juan structural basin regional aquifer-system analysis, New Mexico, Colorado, Arizona, and Utah: U.S. Geological Survey Water-Resources Investigations Report 95-4188, v, 55 p. :ill., maps ;28 cm., https://doi.org/10.3133/wri954188.","productDescription":"v, 55 p. :ill., maps ;28 cm.","costCenters":[],"links":[{"id":158502,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1995/4188/report-thumb.jpg"},{"id":57146,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1995/4188/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b00e4b07f02db698374","contributors":{"authors":[{"text":"Levings, G. W.","contributorId":12485,"corporation":false,"usgs":true,"family":"Levings","given":"G.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":199612,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kernodle, J. M.","contributorId":81139,"corporation":false,"usgs":true,"family":"Kernodle","given":"J.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":199613,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Thorn, C. R.","contributorId":100879,"corporation":false,"usgs":true,"family":"Thorn","given":"C.","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":199614,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":28826,"text":"wri954191 - 1996 - Hydrologic and chemical interaction of the Arkansas River and the Equus Beds aquifer between Hutchinson and Wichita, south-central Kansas","interactions":[],"lastModifiedDate":"2017-08-29T11:30:35","indexId":"wri954191","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"95-4191","title":"Hydrologic and chemical interaction of the Arkansas River and the Equus Beds aquifer between Hutchinson and Wichita, south-central Kansas","docAbstract":"Large chloride concentrations in Arkansas River water have the potential to degrade water quality in the adjacent Equus beds aquifer between Hutchinson and Wichita, Kansas. The aquifer is an important source of water for municipal, industrial, agricultural, and domestic uses.
A three-dimensional, finite-difference, ground-water flow-model program (MODFLOW) was used with data from past studies and data collected during 1988-91 to simulate aquifer and stream conditions during the late 1930's, during 1940-89, and during 1990-2019. Results of ground-water flow-model simulations indicated that declining water levels in the Equus beds aquifer since the 1940's have caused base flow in the Arkansas and Little Arkansas Rivers to decrease. In 1940, the Arkansas and Little Arkansas Rivers had simulated net base-flow gains within the model area of about 21 and about 67 ft3/s (cubic feet per second), respectively. By the end of 1989, the Arkansas River had a simulated net base-flow loss of about 52 ft3/s, and the Little Arkansas River had a net base-flow gain of about 27 ft3/s. Simulations for 1990-2019 showed that the water-level changes in a selected model cell located in the central part of the Wichita well field could range from -0.2 to -78 feet. Waterlevel changes in a selected model cell located near the Arkansas River could range from +1.3 to -1.2 feet. In model simulations where only pumpage varied, net base-flow loss from the Arkansas River to the aquifer ranged from about 59 ft3/s (no increase in pumpage since 1989) to 117 ft3/s (a 3-percent per year increase in pumpage since 1989) by 2019.
Assuming a chloride concentration of 630 milligrams per liter, the median concentration in Arkansas River water collected during 1988-91, the quantity of chloride discharged from the Arkansas River to the aquifer was estimated to have increased from about 21 tons per day in 1940 to about 100 tons per day in 1989. By 2019, chloride discharge was indicated to range from about 110 tons per day (associated with no increase in pumpage since 1989) to 200 tons per day (associated with a 3-percent per year increase in pumpage since 1989).
A particle-tracking program (MODPATH), which used the results from the flow model, was used to simulate the distribution in the aquifer of chloride from the river during the same time periods. Particle-tracking simulations show that, during 1940-89, the simulated distribution of particles representing chloride from the Arkansas River expanded from relatively narrow bands near the river to a wider distribution within the aquifer and the Wichita well field. Particle-tracking simulations indicate that chloride discharge from the Arkansas River may have reached the edge of the Wichita well field as early as 1963.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/wri954191","collaboration":"Prepared in cooperation with the Kansas Water Office, the Equus Beds Groundwater Management District No. 2, and the Bureau of Reclamation, U.S. Department of the Interior","usgsCitation":"Myers, N.C., Hargadine, G., and Gillespie, J.B., 1996, Hydrologic and chemical interaction of the Arkansas River and the Equus Beds aquifer between Hutchinson and Wichita, south-central Kansas: U.S. Geological Survey Water-Resources Investigations Report 95-4191, Report: viii, 100 p.; 2 Plates: 27.30 x 41.80 inches and 34.95 x 36.18 inches, https://doi.org/10.3133/wri954191.","productDescription":"Report: viii, 100 p.; 2 Plates: 27.30 x 41.80 inches and 34.95 x 36.18 inches","costCenters":[],"links":[{"id":57686,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1995/4191/report.pdf","text":"Report","size":"21.88 MB","linkFileType":{"id":1,"text":"pdf"},"description":"Report"},{"id":118897,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1995/4191/report-thumb.jpg"},{"id":344896,"rank":3,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/wri/1995/4191/plate-1.pdf","text":"Plate 1","size":"2.86 MB","linkFileType":{"id":1,"text":"pdf"},"description":"Plate 1"},{"id":344897,"rank":4,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/wri/1995/4191/plate-2.pdf","text":"Plate 2","size":"2.92 MB","linkFileType":{"id":1,"text":"pdf"},"description":"Plate 2"}],"country":"United States","state":"Kansas","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -97.2,\n 37.7\n ],\n [\n -98.1,\n 37.7\n ],\n [\n -98.1,\n 38.3\n ],\n [\n -97.2,\n 38.3\n ],\n [\n -97.2,\n 37.7\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a29e4b07f02db6117d2","contributors":{"authors":[{"text":"Myers, N. C.","contributorId":13622,"corporation":false,"usgs":true,"family":"Myers","given":"N.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":200465,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hargadine, G.D.","contributorId":93927,"corporation":false,"usgs":true,"family":"Hargadine","given":"G.D.","email":"","affiliations":[],"preferred":false,"id":200467,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Gillespie, Joe B.","contributorId":21194,"corporation":false,"usgs":true,"family":"Gillespie","given":"Joe","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":200466,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":30089,"text":"wri964044 - 1996 - Ground-water flow and the potential effects of remediation at Graces Quarters, Aberdeen Proving Ground, Maryland","interactions":[],"lastModifiedDate":"2012-02-02T00:09:07","indexId":"wri964044","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"96-4044","title":"Ground-water flow and the potential effects of remediation at Graces Quarters, Aberdeen Proving Ground, Maryland","docAbstract":"Ground water in the east-central part of Graces Quarters, a former open-air chemical-agent test facility at Aberdeen Proving Ground, Maryland, is contaminated with chlorinated volatile organic compounds. The U.S. Geological Survey's finite- difference model was used to help understand ground-water flow and simulate the effects of alternative remedial actions to clean up the ground water. Scenarios to simulate unstressed conditions and three extraction well con- figurations were used to compare alternative remedial actions on the contaminant plume. The scenarios indicate that contaminants could migrate from their present location to wetland areas within 10 years under unstressed conditions. Pumping 7 gal/min (gallons per minute) from one well upgradient of the plume will not result in containment or removal of the highest contaminant concentrations. Pumping 7 gal/min from three wells along the central axis of the plume should result in containment and removal of dissolved contami- nants, as should pumping 7 gal/min from three wells at the leading edge of the plume while injecting 7 gal/min back into an upgradient well.","language":"ENGLISH","publisher":"U.S. Geological Survey ;\r\nEarth Science Information Center, Open-File Reports Section [distributor],","doi":"10.3133/wri964044","usgsCitation":"Tenbus, F., and Fleck, W., 1996, Ground-water flow and the potential effects of remediation at Graces Quarters, Aberdeen Proving Ground, Maryland: U.S. Geological Survey Water-Resources Investigations Report 96-4044, iv, 31 p. :ill., maps ;28 cm., https://doi.org/10.3133/wri964044.","productDescription":"iv, 31 p. :ill., maps ;28 cm.","costCenters":[],"links":[{"id":125061,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1996/4044/report-thumb.jpg"},{"id":58903,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1996/4044/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4aafe4b07f02db66ca11","contributors":{"authors":[{"text":"Tenbus, F.J.","contributorId":45730,"corporation":false,"usgs":true,"family":"Tenbus","given":"F.J.","email":"","affiliations":[],"preferred":false,"id":202658,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Fleck, W.B.","contributorId":14862,"corporation":false,"usgs":true,"family":"Fleck","given":"W.B.","email":"","affiliations":[],"preferred":false,"id":202657,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":26751,"text":"wri954296 - 1996 - Hydrogeologic investigation and simulation of ground-water flow in the Upper Floridan Aquifer of north-central Florida and southwestern Georgia and delineation of contributing areas for selected city of Tallahassee, Florida, water-supply wells","interactions":[],"lastModifiedDate":"2017-01-27T12:20:28","indexId":"wri954296","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"95-4296","title":"Hydrogeologic investigation and simulation of ground-water flow in the Upper Floridan Aquifer of north-central Florida and southwestern Georgia and delineation of contributing areas for selected city of Tallahassee, Florida, water-supply wells","docAbstract":"A 4-year investigation of the Upper Floridan aquifer and ground-water flow system in Leon County, Florida, and surrounding counties of north-central Florida and southwestern Georgia began in 1990. The purpose of the investigation was to describe the ground-water flow system and to delineate the contributing areas to selected City of Tallahassee, Florida, water-supply wells. The investigation was prompted by the detection of low levels of tetrachloroethylene in ground-water samples collected from several of the city's water-supply wells. Hydrologic data and previous studies indicate that; ground-water flow within the Upper Floridan aquifer can be considered steady-state; the Upper Floridan aquifer is a single water-bearing unit; recharge is from precipitation; and that discharge occurs as spring flow, leakage to rivers, leakage to the Gulf of Mexico, and pumpage. Measured transmissivities of the aquifer ranged from 1,300 ft2/d (feet squared per day) to 1,300,000 ft2/d. Steady-state ground-water flow in the Upper Floridan aquifer was simulated using a three-dimensional ground- water flow model. Transmissivities ranging from less than 5,000 ft2/d to greater than 11,000,000 ft2/d were required to calibrate to observed conditions. Recharge rates used in the model ranged from 18.0 inches per year in areas where the aquifer was unconfined to less than 2 inches per year in broad areas where the aquifer was confined. Contributing areas to five Tallahassee water-supply wells were simulated by particle- tracking techniques. Particles were seeded in model cells containing pumping wells then tracked backwards in time toward recharge areas. The contributing area for each well was simulated twice, once assuming a porosity of 25 percent and once assuming a porosity of 5 percent. A porosity of 25 percent is considered a reasonable average value for the Upper Floridan aquifer; the 5 percent porosity simulated the movement of ground-water through only solution-enhanced bedding plains and fractures. The contributing areas were generally elliptical in shape, reflecting the influence of the sloping potentiometric surface. The contributing areas delineated for a 5 percent porosity were always much larger than those determined using a 25 percent porosity. The lowest average ground-water velocity computed within a contributing area, using a 25 percent porosity, was 1.0 ft/d (foot per day) and the highest velocity was 1.6 ft/d. The lowest average ground-water velocity, determined using a 5 percent porosity, was 2.4 ft/d and the highest was 7.4 ft/d. The contributing areas for each of the five wells was also determined analytically and compared to the model-derived areas. The upgradient width of the simulated contributing areas were larger than the upgradient width of the analytically determined contributing areas for four of the five wells. The model could more accurately delineate contributing areas because of the ability to simulate wells as partially penetrating and by incorporating complex, three-dimensional aquifer characteristics, which the analytical method could not.","language":"ENGLISH","publisher":"U.S. Geological Survey ;\r\nEarth Science Information Center, Open-File Reports Section [distributor],","doi":"10.3133/wri954296","usgsCitation":"Davis, J.H., 1996, Hydrogeologic investigation and simulation of ground-water flow in the Upper Floridan Aquifer of north-central Florida and southwestern Georgia and delineation of contributing areas for selected city of Tallahassee, Florida, water-supply wells: U.S. Geological Survey Water-Resources Investigations Report 95-4296, v, 56 p. :ill., maps ;28 cm., https://doi.org/10.3133/wri954296.","productDescription":"v, 56 p. :ill., maps ;28 cm.","costCenters":[{"id":13634,"text":"South Atlantic Water Science Center","active":true,"usgs":true}],"links":[{"id":2070,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.water.usgs.gov/wri954296","linkFileType":{"id":5,"text":"html"}},{"id":123533,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/wri_95_4296.jpg"}],"country":"United States","state":"Florida, Georgia","county":"Leon County","city":"Tallahassee","otherGeospatial":"Upper Floridan Aquifer","geographicExtents":"{\"type\":\"FeatureCollection\",\"features\":[{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[-84.0835,30.677],[-84.0073,30.6734],[-84.0084,30.6263],[-84.0057,30.6049],[-84.0025,30.593],[-84.002,30.5834],[-83.9962,30.5729],[-83.9893,30.5619],[-83.9818,30.5546],[-83.9819,30.5477],[-83.9834,30.5445],[-83.9829,30.5367],[-83.9813,30.5299],[-83.9776,30.5221],[-83.9999,30.5217],[-84.0413,30.5221],[-84.0418,30.4631],[-84.0746,30.4343],[-84.0756,30.3725],[-84.0755,30.2893],[-84.0755,30.2833],[-84.076,30.2737],[-84.2416,30.2739],[-84.2421,30.2776],[-84.2464,30.2959],[-84.248,30.3032],[-84.2501,30.3037],[-84.3432,30.3034],[-84.375,30.3033],[-84.594,30.3005],[-84.7135,30.3003],[-84.701,30.3182],[-84.702,30.3214],[-84.7063,30.3223],[-84.7106,30.3259],[-84.7138,30.3313],[-84.7096,30.3346],[-84.7048,30.3374],[-84.7007,30.3433],[-84.6912,30.3484],[-84.687,30.3517],[-84.683,30.3611],[-84.6771,30.3657],[-84.6737,30.3652],[-84.6662,30.3671],[-84.6647,30.3712],[-84.6631,30.3803],[-84.6465,30.388],[-84.6454,30.3912],[-84.6413,30.3958],[-84.6365,30.3986],[-84.6333,30.4014],[-84.6223,30.4101],[-84.6133,30.4106],[-84.6054,30.4153],[-84.59,30.4126],[-84.5784,30.4195],[-84.5663,30.4319],[-84.5578,30.4361],[-84.5457,30.4384],[-84.5298,30.4394],[-84.5251,30.4491],[-84.5087,30.4514],[-84.4992,30.4547],[-84.4944,30.4597],[-84.4859,30.4593],[-84.4811,30.457],[-84.4722,30.4589],[-84.4621,30.4571],[-84.4526,30.4617],[-84.4393,30.4622],[-84.4314,30.4659],[-84.4224,30.466],[-84.4113,30.4724],[-84.4028,30.4784],[-84.3975,30.4866],[-84.3992,30.4939],[-84.4034,30.5003],[-84.4061,30.5035],[-84.4061,30.509],[-84.3945,30.5159],[-84.3914,30.5269],[-84.3935,30.5296],[-84.3893,30.5429],[-84.3878,30.5512],[-84.382,30.5567],[-84.3814,30.5603],[-84.3815,30.5644],[-84.3778,30.574],[-84.3709,30.5809],[-84.3593,30.5869],[-84.3513,30.591],[-84.3445,30.5965],[-84.3381,30.5975],[-84.3344,30.598],[-84.3307,30.6048],[-84.3254,30.6149],[-84.3169,30.6231],[-84.3101,30.6319],[-84.3027,30.6383],[-84.3011,30.6456],[-84.3017,30.6547],[-84.3017,30.663],[-84.3049,30.6694],[-84.3033,30.6748],[-84.2975,30.6794],[-84.2901,30.6813],[-84.2842,30.6836],[-84.2811,30.6863],[-84.1803,30.6816],[-84.0835,30.677]]]},\"properties\":{\"name\":\"Leon\",\"state\":\"FL\"}}]}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a4ee4b07f02db627954","contributors":{"authors":[{"text":"Davis, J. Hal hdavis@usgs.gov","contributorId":2454,"corporation":false,"usgs":true,"family":"Davis","given":"J.","email":"hdavis@usgs.gov","middleInitial":"Hal","affiliations":[{"id":5052,"text":"FLWSC-Tallahassee","active":true,"usgs":true}],"preferred":false,"id":196938,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":30029,"text":"wri954281 - 1996 - Hydraulic characteristics and nutrient transport and transformation beneath a rapid infiltration basin, Reedy Creek Improvement District, Orange County, Florida","interactions":[],"lastModifiedDate":"2012-02-02T00:08:59","indexId":"wri954281","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"95-4281","title":"Hydraulic characteristics and nutrient transport and transformation beneath a rapid infiltration basin, Reedy Creek Improvement District, Orange County, Florida","docAbstract":"The Reedy Creek Improvement District disposes of about 7.5 million gallons per day (1992) of reclaimed water through 85 1-acre rapid infiltration basins within a 1,000-acre area of sandy soils in Orange County, Florida. The U.S. Geological Survey conducted field experiments in 1992 at an individual basin to examine and better understand the hydraulic characteristics and nutrient transport and transformation of reclaimed water beneath a rapid infiltration basin. At the time, concentrations of total nitrogen and total phosphorus in reclaimed water were about 3 and 0.25 milligrams per liter, respectively. A two-dimensional, radial, unsaturated/saturated numerical flow model was applied to describe the flow system beneath a rapid infiltration basin under current and hypothetical basin loading scenarios and to estimate the hydraulic properties of the soil and sediment beneath a basin. The thicknesses of the unsaturated and saturated parts of the surficial aquifer system at the basin investigated were about 37 and 52 feet, respectively. The model successfully replicated the field-monitored infiltration rate (about 5.5 feet per day during the daily flooding periods of about 17 hours) and ground-water mounding response during basin operation. Horizontal and vertical hydraulic conductivity of the saturated part of the surficial aquifer system were estimated to be 150 and 45 feet per day, respectively. The field-saturated vertical hydraulic conductivity of the shallow soil, estimated to be about 5.1 feet per day, was considered to have been less than the full- saturation value because of the effects of air entrapment. Specific yield of the surficial aquifer was estimated to be 0.41. The upper 20 feet of the basin subsurface profile probably served as a system control on infiltration because of the relatively low field-saturated, vertical hydraulic conductivity of the sediments within this layer. The flow model indicates that, in the vicinity of the basin, flow in the deeper, saturated zone was relatively slow compared to the more vigorous flow in the shallow saturated zone. The large radial component of flow below the water table in the vicinity of the basin implies that reclaimed water moves preferentially in the shallow part of the saturated zone upon reaching the water table. Therefore, there may be some vertical stratification in the saturated zone, with recently infiltrated water overlying ambient water. The infiltration capacity at the basin would be unaffected by a small (less than 10 feet) increase in background water-table altitude, because the water table would remain below the system control on infiltration. However, water-table rises of 15 and 20 feet were estimated to reduce the infiltration capacity of the basin by 8 and 25 percent, respectively. Model simulations indicate that increasing ponded depth within the basin from 4 to 12 inches and from 4 to 24 inches would increase basin infiltration capacity by less than 6 and 11 percent, respectively. A loading strategy at the basin that relies on long, uninterrupted flooding was shown to offer the possibility of inducing a more anaerobic environment conducive to denitrification while maintaining reclaimed-water disposal capacity. Field measurements indicated that transient, elevated concentrations or "spikes" of nitrate (as high as 33 milligrams per liter as nitrogen) occurred at the leading edge of the infiltrating water and in the shallow saturated zone following a prolonged basin rest period. This phenomenon probably is the result of mineralization and nitrification of organic nitrogen retained with the subsurface during earlier basin loading events. The organic nitrogen was retained in the shallow soil (due to adsorption/straining) and the shallow saturated zone following a prolonged basin rest period. This phenomenon probably is the result of mineralization and nitrification of organic nitrogen retained within the subsurface during earlier basin loading event","language":"ENGLISH","publisher":"U.S. Geological Survey ;\r\nEarth Science Information Center, Open-File Reports Section [distributor],","doi":"10.3133/wri954281","usgsCitation":"Sumner, D.M., and Bradner, L.A., 1996, Hydraulic characteristics and nutrient transport and transformation beneath a rapid infiltration basin, Reedy Creek Improvement District, Orange County, Florida: U.S. Geological Survey Water-Resources Investigations Report 95-4281, v, 51 p. :ill. (some col.), maps (some col.) ;28 cm., https://doi.org/10.3133/wri954281.","productDescription":"v, 51 p. :ill. (some col.), maps (some col.) ;28 cm.","costCenters":[],"links":[{"id":2462,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.water.usgs.gov/wri954281/","linkFileType":{"id":5,"text":"html"}},{"id":122180,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/wri_95_4281.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a51e4b07f02db62a318","contributors":{"authors":[{"text":"Sumner, D. M.","contributorId":100827,"corporation":false,"usgs":true,"family":"Sumner","given":"D.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":202559,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bradner, L. A.","contributorId":21925,"corporation":false,"usgs":true,"family":"Bradner","given":"L.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":202558,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":28721,"text":"wri954259 - 1996 - Evaluation of scour at selected bridge sites in Indiana","interactions":[],"lastModifiedDate":"2016-06-21T11:05:14","indexId":"wri954259","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"95-4259","title":"Evaluation of scour at selected bridge sites in Indiana","docAbstract":"Twenty bridge sites in Indiana were evaluated to determine: the extent of scour during floods, streambed stability, the maximum historical scour, and estimates of potential scour. Historical scour data were collected by means of geophysical methods and used to evaluate the scour-computation procedures recommended by the U.S. Federal Highway Administration and 13 other published pier-scour equations. Hydraulic conditions for the peak historical discharges were estimated by use of WSPRO, a water-surface profile computation model. Depth soundings were made periodically at all of the sites and during flooding at some sites. These data indicate that scour may not totally be a function of discharge or depth but is influenced greatly by debris on piers.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Indianapolis, IN","doi":"10.3133/wri954259","collaboration":"Indiana Department of Transportation","usgsCitation":"Miller, R.L., and Wilson, J., 1996, Evaluation of scour at selected bridge sites in Indiana: U.S. Geological Survey Water-Resources Investigations Report 95-4259, xiii, 225 p. :ill. ;28 cm., https://doi.org/10.3133/wri954259.","productDescription":"xiii, 225 p. :ill. ;28 cm.","startPage":"1","endPage":"225","numberOfPages":"238","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":346,"text":"Indiana Water Science Center","active":true,"usgs":true}],"links":[{"id":119040,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1995/4259/report-thumb.jpg"},{"id":57551,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1995/4259/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"country":"United 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\"}}]}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a09e4b07f02db5fab8c","contributors":{"authors":[{"text":"Miller, R. L.","contributorId":54178,"corporation":false,"usgs":true,"family":"Miller","given":"R.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":200286,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wilson, J.T.","contributorId":97489,"corporation":false,"usgs":true,"family":"Wilson","given":"J.T.","affiliations":[],"preferred":false,"id":200287,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":27593,"text":"wri964089 - 1996 - Scour at bridge sites in Delaware, Maryland, and Virginia","interactions":[],"lastModifiedDate":"2012-02-02T00:08:39","indexId":"wri964089","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":342,"text":"Water-Resources Investigations Report","code":"WRI","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"96-4089","title":"Scour at bridge sites in Delaware, Maryland, and Virginia","docAbstract":"Scour data were obtained from discharge measure- ments to develop and evaluate the reliability of constriction-scour and local-scour equations for rivers in Delaware, Maryland, and Virginia. No independent constriction-scour or local-scour equations were developed from the data because no significant relation was deter-mined between measured scour and streamflow, streambed, and bridge characteristics. Two existing equations were evaluated for prediction of constriction scour and 14 existing equations were evaluated for prediction of local scour. Constriction-scour data were obtained from historical stream discharge measurements, field surveys, and bridge plans at nine bridge sites in the three-State area. Constriction scour was computed by subtracting the average-streambed elevation in the constricted reach from an uncontracted-channel reference elevation. Hydraulic conditions were estimated for the measurements with the greatest discharges by use of the Water-Surface Profile computation model. Measured and calculated constriction-scour data were used to evaluate the reliability of Laursen's clear-water constriction-scour equation and Laursen's live-bed constriction-scour equation. Laursen's clear-water constriction-scour equation underestimated 21 of 23 scour measure- ments made at three sites. A sensitivity analysis showed that the equation is extremely sensitive to estimates of the channel-bottom width. Reduction in estimates of bottom width by one-third resulted in predictions of constriction scour slightly greater than measured values for all scour measurements. Laursen's live-bed constriction- scour equation underestimated 10 of 14 scour measurements made at one site. The error between measured and predicted constriction scour was less than 1.0 ft (feet) for 12 measure-ments and less than 0.5 ft for 8 measurements. Local-scour data were obtained from stream discharge measurements, field surveys, and bridge plans at 15 bridge sites in the three-State area. The reliability of 14 local-scour equations were evaluated. From visual inspection of the plotted data, the Colorado State University, Froehlich design, Laursen, and Mississippi pier-scour equations appeared to be the best predictors of local scour. The Colorado State University equation underestimated 11 scour depths in clear-water scour conditions by a maximum of 2.4 ft, and underestimated 3 scour depth in live-bed scour conditions by a maximum of 1.3 ft. The Froehlich design equation under- estimated two scour depth in clear-water scour conditions by a maximum of 1.2 ft, and under- estimated one scour depth in live-bed scour conditions by a maximum of 0.4 ft. Laursen's equation overestimated the maximum scour depth in clear-water scour conditions by approximately one-half pier width or approximately 1.5 ft, and overestimated the maximum scour depth in live-bed scour conditions by approximately one-pier width or approximately 3 ft. The Mississippi equation underestimated six scour depths in clear-water scour conditions by a maximum of 1.2 ft, and underestimated one scour depth in live-bed scour conditions by 1.6 ft. In both clear-water and live-bed scour conditions, the upper limit for the depth of scour to pier-width ratio for all local scour measurements was 2.1. An accurate pier- approach velocity is necessary to use many local pier-scour equations for bridge design. Velocity data from all the discharge measurements reviewed for this investigation were used to develop a design curve to estimate pier-approach velocity from mean cross-sectional velocity. A least- squares regression and offset were used to envelop the velocity data.","language":"ENGLISH","publisher":"U.S. Geological Survey ;\r\nInformation Services [distributor],","doi":"10.3133/wri964089","usgsCitation":"Hayes, D.C., 1996, Scour at bridge sites in Delaware, Maryland, and Virginia: U.S. Geological Survey Water-Resources Investigations Report 96-4089, iv, 35 p. :ill., maps ;28 cm., https://doi.org/10.3133/wri964089.","productDescription":"iv, 35 p. :ill., maps ;28 cm.","costCenters":[],"links":[{"id":158806,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wri/1996/4089/report-thumb.jpg"},{"id":56464,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wri/1996/4089/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e479de4b07f02db491d41","contributors":{"authors":[{"text":"Hayes, Donald C.","contributorId":14000,"corporation":false,"usgs":true,"family":"Hayes","given":"Donald","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":198382,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70018568,"text":"70018568 - 1996 - Potential role of vegetation feedback in the climate sensitivity of high-latitude regions: A case study at 6000 years B.P.","interactions":[],"lastModifiedDate":"2023-11-29T16:24:05.038875","indexId":"70018568","displayToPublicDate":"1996-12-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1836,"text":"Global Biogeochemical Cycles","active":true,"publicationSubtype":{"id":10}},"title":"Potential role of vegetation feedback in the climate sensitivity of high-latitude regions: A case study at 6000 years B.P.","docAbstract":"Previous climate model simulations have shown that the configuration of the Earth's orbit during the early to mid-Holocene (approximately 10–5 kyr) can account for the generally warmer-than-present conditions experienced by the high latitudes of the northern hemisphere. New simulations for 6 kyr with two atmospheric/mixed-layer ocean models (Community Climate Model, version 1, CCMl, and Global ENvironmental and Ecological Simulation of Interactive Systems, version 2, GENESIS 2) are presented here and compared with results from two previous simulations with GENESIS 1 that were obtained with and without the albedo feedback due to climate-induced poleward expansion of the boreal forest. The climate model results are summarized in the form of potential vegetation maps obtained with the global BIOME model, which facilitates visual comparisons both among models and with pollen and plant macrofossil data recording shifts of the forest-tundra boundary. A preliminary synthesis shows that the forest limit was shifted 100–200 km north in most sectors. Both CCMl and GENESIS 2 produced a shift of this magnitude. GENESIS 1 however produced too small a shift, except when the boreal forest albedo feedback was included. The feedback in this case was estimated to have amplified forest expansion by approximately 50%. The forest limit changes also show meridional patterns (greatest expansion in central Siberia and little or none in Alaska and Labrador) which have yet to be reproduced by models. Further progress in understanding of the processes involved in the response of climate and vegetation to orbital forcing will require both the deployment of coupled atmosphere-biosphere-ocean models and the development of more comprehensive observational data sets.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/96GB02690","usgsCitation":"Kutzbach, J., Bartlein, P., Foley, J., Harrison, S.P., Hostetler, S.W., Liu, Z., Prentice, I.C., and Webb, T., 1996, Potential role of vegetation feedback in the climate sensitivity of high-latitude regions: A case study at 6000 years B.P.: Global Biogeochemical Cycles, v. 10, no. 4, p. 727-736, https://doi.org/10.1029/96GB02690.","productDescription":"10 p.","startPage":"727","endPage":"736","numberOfPages":"10","costCenters":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"links":[{"id":227612,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"10","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a7f5be4b0c8380cd7aaa3","contributors":{"authors":[{"text":"Kutzbach, J.-E.","contributorId":93221,"corporation":false,"usgs":true,"family":"Kutzbach","given":"J.-E.","email":"","affiliations":[],"preferred":false,"id":380075,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bartlein, P. J.","contributorId":54566,"corporation":false,"usgs":false,"family":"Bartlein","given":"P. J.","affiliations":[],"preferred":false,"id":380070,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Foley, J.A.","contributorId":11782,"corporation":false,"usgs":true,"family":"Foley","given":"J.A.","email":"","affiliations":[],"preferred":false,"id":380068,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Harrison, S. P.","contributorId":78488,"corporation":false,"usgs":false,"family":"Harrison","given":"S.","email":"","middleInitial":"P.","affiliations":[],"preferred":false,"id":380074,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Hostetler, Steven W.. 0000-0003-2272-8302 swhosteller@usgs.gov","orcid":"https://orcid.org/0000-0003-2272-8302","contributorId":69731,"corporation":false,"usgs":true,"family":"Hostetler","given":"Steven","email":"swhosteller@usgs.gov","middleInitial":"W..","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":false,"id":380072,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Liu, Z.","contributorId":70943,"corporation":false,"usgs":true,"family":"Liu","given":"Z.","email":"","affiliations":[],"preferred":false,"id":380073,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Prentice, I. C.","contributorId":63969,"corporation":false,"usgs":true,"family":"Prentice","given":"I.","middleInitial":"C.","affiliations":[],"preferred":false,"id":380071,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Webb, T. III","contributorId":38297,"corporation":false,"usgs":true,"family":"Webb","given":"T.","suffix":"III","email":"","affiliations":[],"preferred":false,"id":380069,"contributorType":{"id":1,"text":"Authors"},"rank":8}]}} ]}