Nutrient and sediment fluxes and changes in fluxes over time are key indicators that water resource managers can use to assess the progress being made in improving the structure and function of the Chesapeake Bay ecosystem. The U.S. Geological Survey collects annual nutrient (nitrogen and phosphorus) and sediment flux data and computes trends that describe the extent to which water-quality conditions are changing within the major Chesapeake Bay tributaries. Two regression-based approaches were compared for estimating annual nutrient and sediment fluxes and for characterizing how these annual fluxes are changing over time. The two regression models compared are the traditionally used ESTIMATOR and the newly developed Weighted Regression on Time, Discharge, and Season (WRTDS). The model comparison focused on answering three questions: (1) What are the differences between the functional form and construction of each model? (2) Which model produces estimates of flux with the greatest accuracy and least amount of bias? (3) How different would the historical estimates of annual flux be if WRTDS had been used instead of ESTIMATOR? One additional point of comparison between the two models is how each model determines trends in annual flux once the year-to-year variations in discharge have been determined. All comparisons were made using total nitrogen, nitrate, total phosphorus, orthophosphorus, and suspended-sediment concentration data collected at the nine U.S. Geological Survey River Input Monitoring stations located on the Susquehanna, Potomac, James, Rappahannock, Appomattox, Pamunkey, Mattaponi, Patuxent, and Choptank Rivers in the Chesapeake Bay watershed.
\nTwo model characteristics that uniquely distinguish ESTIMATOR and WRTDS are the fundamental model form and the determination of model coefficients. ESTIMATOR and WRTDS both predict water-quality constituent concentration by developing a linear relation between the natural logarithm of observed constituent concentration and three explanatory variables—the natural log of discharge, time, and season. ESTIMATOR uses two additional explanatory variables—the square of the log of discharge and time-squared. Both models determine coefficients for variables for a series of estimation windows. ESTIMATOR establishes variable coefficients for a series of 9-year moving windows; all observed constituent concentration data within the 9-year window are used to establish each coefficient. Conversely, WRTDS establishes variable coefficients for each combination of discharge and time using only observed concentration data that are similar in time, season, and discharge to the day being estimated. As a result of these distinguishing characteristics, ESTIMATOR reproduces concentration-discharge relations that are closely approximated by a quadratic or linear function with respect to both the log of discharge and time. Conversely, the linear model form of WRTDS coupled with extensive model windowing for each combination of discharge and time allows WRTDS to reproduce observed concentration-discharge relations that are more sinuous in form.
\nAnother distinction between ESTIMATOR and WRTDS is the reporting of uncertainty associated with the model estimates of flux and trend. ESTIMATOR quantifies the standard error of prediction associated with the determination of flux and trends. The standard error of prediction enables the determination of the 95-percent confidence intervals for flux and trend as well as the ability to test whether the reported trend is significantly different from zero (where zero equals no trend). Conversely, WRTDS is unable to propagate error through the many (over 5,000) models for unique combinations of flow and time to determine a total standard error. As a result, WRTDS flux estimates are not reported with confidence intervals and a level of significance is not determined for flow-normalized fluxes.
\nThe differences between ESTIMATOR and WRTDS, with regard to model form and determination of model coefficients, have an influence on the determination of nutrient and sediment fluxes and associated changes in flux over time as a result of management activities. The comparison between the model estimates of flux and trend was made for combinations of five water-quality constituents at nine River Input Monitoring stations.
\nThe major findings with regard to nutrient and sediment fluxes are as follows: (1)WRTDS produced estimates of flux for all combinations that were more accurate, based on reduction in root mean squared error, than flux estimates from ESTIMATOR; (2) for 67 percent of the combinations, WRTDS and ESTIMATOR both produced estimates of flux that were minimally biased compared to observed fluxes(flux bias = tendency to over or underpredict flux observations); however, for 33 percent of the combinations, WRTDS produced estimates of flux that were considerably less biased (by at least 10 percent) than flux estimates from ESTIMATOR; (3) the average percent difference in annual fluxes generated by ESTIMATOR and WRTDS was less than 10 percent at 80 percent of the combinations; and (4) the greatest differences related to flux bias and annual fluxes all occurred for combinations where the pattern in observed concentration-discharge relation was sinuous (two points of inflection) rather than linear or quadratic (zero or one point of inflection).
\nThe major findings with regard to trends are as follows: (1) both models produce water-quality trends that have factored in the year-to-year variations in flow; (2) trends in water-quality condition are represented by ESTIMATOR as a trend in flow-adjusted concentration and by WRTDS as a flow normalized flux; (3) for 67 percent of the combinations with trend estimates, the WRTDS trends in flow-normalized flux are in the same direction and magnitude to the ESTIMATOR trends in flow-adjusted concentration, and at the remaining 33 percent the differences in trend magnitude and direction are related to fundamental differences between concentration and flux; and (4) the majority (85 percent) of the total nitrogen, nitrate, and orthophosphorus combinations exhibited long-term (1985 to 2010) trends in WRTDS flow-normalized flux that indicate improvement or reduction in associated flux and the majority (83 percent) of the total phosphorus (from 1985 to 2010) and suspended sediment (from 2001 to 2010) combinations exhibited trends in WRTDS flow-normalized flux that indicate degradation or increases in the flux delivered.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/sir20125244","isbn":"978-1-4113-3525-7","collaboration":"Prepared in cooperation with the Virginia Department of Environmental Quality, Maryland Department of Natural Resources, and the U.S. Environmental Protection Agency Chesapeake Bay Program","usgsCitation":"Moyer, D., Hirsch, R.M., and Hyer, K., 2012, Comparison of two regression-based approaches for determining nutrient and sediment fluxes and trends in the Chesapeake Bay watershed: U.S. Geological Survey Scientific Investigations Report 2012-5244, x, 118 p., https://doi.org/10.3133/sir20125244.","productDescription":"x, 118 p.","numberOfPages":"132","costCenters":[{"id":614,"text":"Virginia Water Science 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The impetus behind the creation of the NWHC was, in part, the catastrophic loss of tens of thousands of waterfowl as a result of an outbreak of duck plague at the Lake Andes National Wildlife Refuge in South Dakota during January 1973. In 1996, the NWHC, along with other Department of Interior research functions, was transferred from the U.S. Fish and Wildlife Service to the U.S. Geological Survey (USGS), where we remain one of many entities that provide the independent science that forms the bases of the sound management of the Nation’s natural resources. Our mission is to provide national leadership to safeguard wildlife and ecosystem health through dynamic partnerships and exceptional science. The main campus of the NWHC is located in Madison, Wis., where we maintain biological safety level 3 (BSL–3) diagnostic and research facilities purposefully designed for work with wildlife species. The NWHC provides research and technical assistance on wildlife health issues to State, Federal, and international agencies. In addition, since 1992 we have maintained a field station in Hawaii, the Honolulu Field Station, which focuses on marine and terrestrial natural resources throughout the Pacific region. The NWHC conducts diagnostic investigations of unusual wildlife morbidity and mortality events nationwide to detect the presence of wildlife pathogens and determine the cause of death. This is also an important activity for detecting new, emerging and resurging diseases. The NWHC provides this crucial information on the presence of wildlife diseases to wildlife managers to support sound management decisions. The data and information generated also allows for further indepth analyses for determining the biological and ecological significance of disease events, detecting disease trends over time and space, as well as detecting any significant changes to how diseases manifest in the field. Moreover, this information allows us to gain insight into the significance of future wildlife disease events. The purpose of this report is to provide a sample of NWHC data that are available from our Laboratory Information Management System (LIMS). These data are presented in summary format with minimal statistical analysis and interpretation. The goal is to share these data with wildlife managers and other stakeholders, promote the use of NHWC data, and encourage the sharing of wildlife disease data to improve temporal and geographic surveillance coverage. Continued national surveillance for wildlife diseases is essential for providing early detection and warning of events that have the potential to result in harm to human health, economic losses, declines in wildlife populations, and subsequent ecological disturbances. Increased collaboration, coordination, and sharing of surveillance data will enhance this Nation’s ability to detect and respond to wildlife disease threats.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/sir20125271","usgsCitation":"Green, D.E., Hines, M., Russell, R.E., and Sleeman, J.M., 2012, U.S. Geological Survey, National Wildlife Health Center, 2011 report of selected wildlife diseases: U.S. Geological Survey Scientific Investigations Report 2012-5271, vi, 39 p., https://doi.org/10.3133/sir20125271.","productDescription":"vi, 39 p.","startPage":"i","endPage":"39","numberOfPages":"49","onlineOnly":"Y","additionalOnlineFiles":"N","temporalStart":"2011-01-01","temporalEnd":"2011-12-31","costCenters":[{"id":456,"text":"National Wildlife Health Center","active":true,"usgs":true}],"links":[{"id":265532,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/sir_2012_5271.gif"},{"id":265530,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/sir/2012/5271/"},{"id":265531,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/sir/2012/5271/pdf/NWHC-SIR2012_5271.pdf"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"53cd7a07e4b0b2908510d372","contributors":{"authors":[{"text":"Green, David E. 0000-0002-7663-1832 degreen@usgs.gov","orcid":"https://orcid.org/0000-0002-7663-1832","contributorId":3715,"corporation":false,"usgs":true,"family":"Green","given":"David","email":"degreen@usgs.gov","middleInitial":"E.","affiliations":[{"id":456,"text":"National Wildlife Health Center","active":true,"usgs":true}],"preferred":true,"id":516198,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hines, Megan 0000-0002-9845-4849 mhines@usgs.gov","orcid":"https://orcid.org/0000-0002-9845-4849","contributorId":4783,"corporation":false,"usgs":true,"family":"Hines","given":"Megan","email":"mhines@usgs.gov","affiliations":[{"id":5054,"text":"Office of Water Information","active":true,"usgs":true},{"id":574,"text":"St. Petersburg Coastal and Marine Science Center","active":true,"usgs":true},{"id":160,"text":"Center for Integrated Data Analytics","active":false,"usgs":true},{"id":677,"text":"Wisconsin Water Science Center","active":true,"usgs":true}],"preferred":true,"id":516200,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Russell, Robin E. 0000-0001-8726-7303 rerussell@usgs.gov","orcid":"https://orcid.org/0000-0001-8726-7303","contributorId":3998,"corporation":false,"usgs":true,"family":"Russell","given":"Robin","email":"rerussell@usgs.gov","middleInitial":"E.","affiliations":[{"id":456,"text":"National Wildlife Health Center","active":true,"usgs":true}],"preferred":true,"id":516199,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Sleeman, Jonathan M. 0000-0002-9910-6125 jsleeman@usgs.gov","orcid":"https://orcid.org/0000-0002-9910-6125","contributorId":128,"corporation":false,"usgs":true,"family":"Sleeman","given":"Jonathan","email":"jsleeman@usgs.gov","middleInitial":"M.","affiliations":[{"id":456,"text":"National Wildlife Health Center","active":true,"usgs":true},{"id":82110,"text":"Midcontinent Regional Director's Office","active":true,"usgs":true}],"preferred":true,"id":516197,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70042467,"text":"fs20123098 - 2012 - Groundwater quality in Coachella Valley, California","interactions":[],"lastModifiedDate":"2013-01-09T15:12:53","indexId":"fs20123098","displayToPublicDate":"2013-01-09T00:00:00","publicationYear":"2012","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":313,"text":"Fact Sheet","code":"FS","onlineIssn":"2327-6932","printIssn":"2327-6916","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2012-3098","title":"Groundwater quality in Coachella Valley, California","docAbstract":"Groundwater provides more than 40 percent of California’s drinking water. To protect this vital resource, the State of California created the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The Priority Basin Project of the GAMA Program provides a comprehensive assessment of the State’s groundwater quality and increases public access to groundwater-quality information. Coachella Valley is one of the study areas being evaluated. The Coachella study area is approximately 820 square miles (2,124 square kilometers) and includes the Coachella Valley groundwater basin (California Department of Water Resources, 2003). Coachella Valley has an arid climate, with average annual rainfall of about 6 inches (15 centimeters). The runoff from the surrounding mountains drains to rivers that flow east and south out of the study area to the Salton Sea. Land use in the study area is approximately 67 percent (%) natural, 21% agricultural, and 12% urban. The primary natural land cover is shrubland. The largest urban areas are the cities of Indio and Palm Springs (2010 populations of 76,000 and 44,000, respectively). Groundwater in this basin is used for public and domestic water supply and for irrigation. The main water-bearing units are gravel, sand, silt, and clay derived from surrounding mountains. The primary aquifers in Coachella Valley are defined as those parts of the aquifers corresponding to the perforated intervals of wells listed in the California Department of Public Health database. Public-supply wells in Coachella Valley are completed to depths between 490 and 900 feet (149 to 274 meters), consist of solid casing from the land surface to a depth of 260 to 510 feet (79 to 155 meters), and are screened or perforated below the solid casing. Recharge to the groundwater system is primarily runoff from the surrounding mountains, and by direct infiltration of irrigation. The primary sources of discharge are pumping wells, evapotranspiration, and underflow to the Salton Sea and Imperial Valley areas.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/fs20123098","collaboration":"U.S. Geological Survey and the California State Water Resources Control Board. This report has related reports. Please see: SIR 2012-5040, FS 2012-3032, FS 2012-3033, FS 2012-3034, FS 2012-3035, FS 2012-3036.","usgsCitation":"Dawson, B.J., and Belitz, K., 2012, Groundwater quality in Coachella Valley, California: U.S. Geological Survey Fact Sheet 2012-3098, Report: 4 p.; Related Reports: SIR 2012-5040, FS 2012-3032, FS 2012-3033, FS 2012-3034, FS 2012-3035, FS 2012-3036, https://doi.org/10.3133/fs20123098.","productDescription":"Report: 4 p.; Related Reports: SIR 2012-5040, FS 2012-3032, FS 2012-3033, FS 2012-3034, FS 2012-3035, FS 2012-3036","additionalOnlineFiles":"Y","costCenters":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"links":[{"id":265472,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/fs_2012_3098.jpg"},{"id":265466,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/sir/2012/5040/"},{"id":265467,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3032"},{"id":265468,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3033"},{"id":265469,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3034"},{"id":265470,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3035"},{"id":265471,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3036"},{"id":265464,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/fs/2012/3098/"},{"id":265465,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/fs/2012/3098/pdf/fs20123098.pdf"}],"country":"United States","state":"California","otherGeospatial":"Coachella Valley","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -117.0,33.3 ], [ -117.0,34.1 ], [ -115.75,34.1 ], [ -115.75,33.3 ], [ -117.0,33.3 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"50ee916fe4b0160a2d0ee32b","contributors":{"authors":[{"text":"Dawson, Barbara J. Milby 0000-0002-0209-8158","orcid":"https://orcid.org/0000-0002-0209-8158","contributorId":57334,"corporation":false,"usgs":true,"family":"Dawson","given":"Barbara","email":"","middleInitial":"J. Milby","affiliations":[],"preferred":false,"id":471600,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Belitz, Kenneth 0000-0003-4481-2345 kbelitz@usgs.gov","orcid":"https://orcid.org/0000-0003-4481-2345","contributorId":442,"corporation":false,"usgs":true,"family":"Belitz","given":"Kenneth","email":"kbelitz@usgs.gov","affiliations":[{"id":451,"text":"National Water Quality Assessment Program","active":true,"usgs":true},{"id":27111,"text":"National Water Quality Program","active":true,"usgs":true},{"id":503,"text":"Office of Water Quality","active":true,"usgs":true},{"id":376,"text":"Massachusetts Water Science Center","active":true,"usgs":true},{"id":466,"text":"New England Water Science Center","active":true,"usgs":true}],"preferred":true,"id":471599,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70042446,"text":"sir20125273 - 2012 - Shallow groundwater quality and geochemistry in the Fayetteville Shale gas-production area, north-central Arkansas, 2011","interactions":[],"lastModifiedDate":"2013-01-09T10:38:26","indexId":"sir20125273","displayToPublicDate":"2013-01-09T00:00:00","publicationYear":"2012","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":334,"text":"Scientific Investigations Report","code":"SIR","onlineIssn":"2328-0328","printIssn":"2328-031X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2012-5273","title":"Shallow groundwater quality and geochemistry in the Fayetteville Shale gas-production area, north-central Arkansas, 2011","docAbstract":"The Mississippian Fayetteville Shale serves as an unconventional gas reservoir across north-central Arkansas, ranging in thickness from approximately 50 to 550 feet and varying in depth from approximately 1,500 to 6,500 feet below the ground surface. Primary permeability in the Fayetteville Shale is severely limited, and successful extraction of the gas reservoir is the result of advances in horizontal drilling techniques and hydraulic fracturing to enhance and develop secondary fracture porosity and permeability. Drilling and production of gas wells began in 2004, with a steady increase in production thereafter. As of April 2012, approximately 4,000 producing wells had been completed in the Fayetteville Shale. In Van Buren and Faulkner Counties, 127 domestic water wells were sampled and analyzed for major ions and trace metals, with a subset of the samples analyzed for methane and carbon isotopes to describe general water quality and geochemistry and to investigate the potential effects of gas-production activities on shallow groundwater in the study area. Water-quality analyses from this study were compared to historical (pregas development) shallow groundwater quality collected in the gas-production area. An additional comparison was made using analyses from this study of groundwater quality in similar geologic and topographic areas for well sites less than and greater than 2 miles from active gas-production wells. Chloride concentrations for the 127 groundwater samples collected for this study ranged from approximately 1.0 milligram per liter (mg/L) to 70 mg/L, with a median concentration of 3.7 mg/L, as compared to maximum and median concentrations for the historical data of 378 mg/L and 20 mg/L, respectively. Statistical analysis of the data sets revealed statistically larger chloride concentrations (p-value <0.001) in the historical data compared to data collected for this study. Chloride serves as an important indicator parameter based on its conservative transport characteristics and relatively elevated concentrations in production waters associated with gas extraction activities. Major ions and trace metals additionally had lower concentrations in data gathered for this study than in the historical analyses. Additionally, no statistical difference existed between chloride concentrations from water-quality data collected for this study from 94 wells located less than 2 miles from a gas-production well and 33 wells located 2 miles or more from a gas-production well; a Wilcoxon rank-sum test showed a p-value of 0.71. Major ion chemistry was investigated to understand the effects of geochemical and reduction-oxidation (redox) processes on the shallow groundwater in the study area along a continuum of increased rock-water interaction represented by increases in dissolved solids concentration. Groundwater in sandstone formations is represented by a low dissolved solids concentration (less than 30 mg/L) and slightly acidic water type. Shallow shale aquifers were represented by dissolved solids concentrations ranging upward to 686 mg/L, and water types evolving from a dominantly mixed-bicarbonate and calcium-bicarbonate to a strongly sodium-bicarbonate water type. Methane concentration and carbon isotopic composition were analyzed in 51 of the 127 samples collected for this study. Methane occurred above a detection limit of 0.0002 mg/L in 32 of the 51 samples, with concentrations ranging upward to 28.5 mg/L. Seven samples had methane concentrations greater than or equal to 0.5 mg/L. The carbon isotopic composition of these higher concentration samples, including the highest concentration of 28.5 mg/L, shows the methane was likely biogenic in origin with carbon isotope ratio values ranging from -57.6 to -74.7 per mil. Methane concentrations increased with increases in dissolved solids concentrations, indicating more strongly reducing conditions with increasing rock-water interaction in the aquifer. As such, groundwater-quality data collected for this study indicate that groundwater chemistry in the shallow aquifer system in the study area is a result of natural processes, beginning with recharge of dilute atmospheric precipitation and evolution of observed groundwater chemistry through rock-water interaction and redox processes.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/sir20125273","collaboration":"Prepared in cooperation with (in alphabetical order) the Arkansas Natural Resources Commission, Arkansas Oil and Gas Commission, Duke University, Faulkner County, Shirley Community Development Corporation, and the University of Arkansas at Fayetteville, and the U.S. Geological Survey Groundwater Resources Program","usgsCitation":"Kresse, T.M., Warner, N., Hays, P.D., Down, A., Vengosh, A., and Jackson, R.B., 2012, Shallow groundwater quality and geochemistry in the Fayetteville Shale gas-production area, north-central Arkansas, 2011: U.S. Geological Survey Scientific Investigations Report 2012-5273, Report: viii, 31 p.; Appendixes, https://doi.org/10.3133/sir20125273.","productDescription":"Report: viii, 31 p.; Appendixes","numberOfPages":"42","onlineOnly":"Y","additionalOnlineFiles":"Y","temporalStart":"2011-01-01","temporalEnd":"2012-04-30","costCenters":[{"id":129,"text":"Arkansas Water Science Center","active":true,"usgs":true}],"links":[{"id":265422,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/sir/2012/5273/"},{"id":265423,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/sir/2012/5273/sir2012-5273.pdf"},{"id":265424,"type":{"id":3,"text":"Appendix"},"url":"https://pubs.usgs.gov/sir/2012/5273/sir2012-5273_app.xlsx"},{"id":265425,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/sir_2012_5273.gif"}],"datum":"Datum World Geodetic System 1984","country":"United States","state":"Arkansas","county":"Cleburne;Conway;Faulkner;Pope;Stone;Van Buren;White","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -93.0,35.0 ], [ -93.0,36.0 ], [ -91.8,36.0 ], [ -91.8,35.0 ], [ -93.0,35.0 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"50ee9175e4b0160a2d0ee343","contributors":{"authors":[{"text":"Kresse, Timothy M. 0000-0003-1035-0672 tkresse@usgs.gov","orcid":"https://orcid.org/0000-0003-1035-0672","contributorId":2758,"corporation":false,"usgs":true,"family":"Kresse","given":"Timothy","email":"tkresse@usgs.gov","middleInitial":"M.","affiliations":[{"id":24708,"text":"Lower Mississippi-Gulf Water Science Center","active":true,"usgs":true},{"id":129,"text":"Arkansas Water Science Center","active":true,"usgs":true}],"preferred":true,"id":471553,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Warner, Nathaniel R.","contributorId":56129,"corporation":false,"usgs":true,"family":"Warner","given":"Nathaniel R.","affiliations":[],"preferred":false,"id":471557,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hays, Phillip D. 0000-0001-5491-9272 pdhays@usgs.gov","orcid":"https://orcid.org/0000-0001-5491-9272","contributorId":4145,"corporation":false,"usgs":true,"family":"Hays","given":"Phillip","email":"pdhays@usgs.gov","middleInitial":"D.","affiliations":[{"id":369,"text":"Louisiana Water Science Center","active":true,"usgs":true},{"id":24708,"text":"Lower Mississippi-Gulf Water Science Center","active":true,"usgs":true},{"id":129,"text":"Arkansas Water Science Center","active":true,"usgs":true}],"preferred":true,"id":471554,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Down, Adrian","contributorId":96175,"corporation":false,"usgs":true,"family":"Down","given":"Adrian","email":"","affiliations":[],"preferred":false,"id":471558,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Vengosh, Avner","contributorId":21842,"corporation":false,"usgs":true,"family":"Vengosh","given":"Avner","affiliations":[],"preferred":false,"id":471555,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Jackson, Robert B. 0000-0001-8846-7147","orcid":"https://orcid.org/0000-0001-8846-7147","contributorId":34252,"corporation":false,"usgs":false,"family":"Jackson","given":"Robert","email":"","middleInitial":"B.","affiliations":[{"id":6986,"text":"Stanford University","active":true,"usgs":false}],"preferred":false,"id":471556,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70042491,"text":"ofr20121210 - 2012 - 2008 Joint United States-Canadian program to explore the limits of the Extended Continental Shelf aboard the U.S. Coast Guard cutter Healy--Cruise HLY0806","interactions":[],"lastModifiedDate":"2013-01-09T17:36:19","indexId":"ofr20121210","displayToPublicDate":"2013-01-09T00:00:00","publicationYear":"2012","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":"2012-1210","title":"2008 Joint United States-Canadian program to explore the limits of the Extended Continental Shelf aboard the U.S. Coast Guard cutter Healy--Cruise HLY0806","docAbstract":"In September 2008, the U.S. Geological Survey (USGS), in cooperation with Natural Resources Canada, Geological Survey of Canada (GSC), conducted bathymetric and geophysical surveys in the Arctic Beaufort Sea aboard the U.S. Coast Guard cutter USCGC Healy. The principal objective of this mission to the high Arctic was to acquire data in support of delineation of the outer limits of the U.S. and Canadian Extended Continental Shelf (ECS) in the Arctic Ocean in accordance with the provisions of Article 76 of the Law of the Sea Convention.\n\nThe Healy was accompanied by the Canadian Coast Guard icebreaker Louis S. St- Laurent. The science parties on the two vessels consisted principally of staff from the USGS (Healy), and the GSC and the Canadian Hydrographic Service (Louis). The crew included marine mammal and Native-community observers, ice observers, and biologists conducting research of opportunity in the Arctic Ocean.\n\nThe joint survey proved an unqualified success. The Healy collected 5,528 km of swath (multibeam) bathymetry (38,806 km2) and CHIRP subbottom profile data, with accompanying marine gravity measurements. The Louis acquired 2,817 km of multichannel seismic (airgun) deep-penetration reflection-profile data along 12 continuous lines, as well as 35 sonobuoy refraction stations and accompanying single-beam bathymetry. The coordinated efforts of the two vessels resulted in seismic-reflection profile data of much higher quality and continuity than if the data had been acquired with a single vessel alone. Equipment failure rate of the seismic equipment gear aboard the Louis was greatly improved with the advantage of having a leading icebreaker. When ice conditions proved too severe to deploy the seismic system, the Louis led the Healy, resulting in much improved quality of the swath bathymetry and CHIRP sub-bottom data in comparison with data collected by the Healy in the lead or working alone. Ancillary science objectives, including ice observations, deployment of ice-monitoring buoys and water-column sampling for biologic (phytoplankton) studies, were also successfully accomplished.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr20121210","usgsCitation":"Childs, J.R., Triezenberg, P., and Danforth, W.W., 2012, 2008 Joint United States-Canadian program to explore the limits of the Extended Continental Shelf aboard the U.S. Coast Guard cutter Healy--Cruise HLY0806: U.S. Geological Survey Open-File Report 2012-1210, iii, 15 p.; col. ill.; maps (col.); Appendices: A-G, https://doi.org/10.3133/ofr20121210.","productDescription":"iii, 15 p.; col. ill.; maps (col.); Appendices: A-G","startPage":"i","endPage":"15","numberOfPages":"19","onlineOnly":"Y","additionalOnlineFiles":"Y","costCenters":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":265496,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/ofr_2012_1210.gif"},{"id":265494,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/2012/1210/of2012-1210_text.pdf"},{"id":265495,"type":{"id":3,"text":"Appendix"},"url":"https://pubs.usgs.gov/of/2012/1210/appendixes"},{"id":265493,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/of/2012/1210/"}],"otherGeospatial":"Beaufort Sea","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -165.0,70.0 ], [ -165.0,85.0 ], [ -120.0,85.0 ], [ -120.0,70.0 ], [ -165.0,70.0 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"53cd4924e4b0b290850eee9d","contributors":{"authors":[{"text":"Childs, Jonathan R. jchilds@usgs.gov","contributorId":3155,"corporation":false,"usgs":true,"family":"Childs","given":"Jonathan","email":"jchilds@usgs.gov","middleInitial":"R.","affiliations":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":471636,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Triezenberg, Peter J.","contributorId":32625,"corporation":false,"usgs":true,"family":"Triezenberg","given":"Peter J.","affiliations":[],"preferred":false,"id":471638,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Danforth, William W. 0000-0002-6382-9487 bdanforth@usgs.gov","orcid":"https://orcid.org/0000-0002-6382-9487","contributorId":3292,"corporation":false,"usgs":true,"family":"Danforth","given":"William","email":"bdanforth@usgs.gov","middleInitial":"W.","affiliations":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":471637,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70042456,"text":"fs20123036 - 2012 - Groundwater quality in the Mojave area, California","interactions":[],"lastModifiedDate":"2018-06-08T12:36:04","indexId":"fs20123036","displayToPublicDate":"2013-01-09T00:00:00","publicationYear":"2012","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":313,"text":"Fact Sheet","code":"FS","onlineIssn":"2327-6932","printIssn":"2327-6916","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2012-3036","title":"Groundwater quality in the Mojave area, California","docAbstract":"Groundwater provides more than 40 percent of California’s drinking water. To protect this vital resource, the State of California created the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The Priority Basin Project of the GAMA Program provides a comprehensive assessment of the State’s groundwater quality and increases public access to groundwater-quality information. Four groundwater basins along the Mojave River make up one of the study areas being evaluated. The Mojave study area is approximately 1,500 square miles (3,885 square kilometers) and includes four contiguous groundwater basins: Upper, Middle, and Lower Mojave River Groundwater Basins, and the El Mirage Valley (California Department of Water Resources, 2003). The Mojave study area has an arid climate, and is part of the Mojave Desert. Average annual rainfall is about 6 inches (15 centimeters). Land use in the study area is approximately 82 percent (%) natural (mostly shrubland), 4% agricultural, and 14% urban. The primary crops are pasture and hay. The largest urban areas are the cities of Victorville, Hesperia, and Apple Valley (2010 populations of 116,000, 90,000 and 69,000, respectively). Groundwater in these basins is used for public and domestic water supply and for irrigation. The main water-bearing units are gravel, sand, silt, and clay derived from surrounding mountains. The primary aquifers in the Mojave study area are defined as those parts of the aquifers corresponding to the perforated intervals of wells listed in the California Department of Public Health database. Public-supply wells in the Mojave study area are completed to depths between 200 and 600 feet (18 to 61 meters), consist of solid casing from the land surface to a depth of 130 to 420 feet (40 to 128 meters), and are screened or perforated below the solid casing. Recharge to the groundwater system is primarily runoff from the mountains to the south, mostly through the Mojave River channel. The primary sources of discharge are pumping wells and evapotranspiration.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/fs20123036","collaboration":"U.S. Geological Survey and the California State Water Resources Control Board","usgsCitation":"Dawson, B.J., and Belitz, K., 2012, Groundwater quality in the Mojave area, California: U.S. Geological Survey Fact Sheet 2012-3036, 4 p., https://doi.org/10.3133/fs20123036.","productDescription":"4 p.","costCenters":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"links":[{"id":265492,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/fs_2012_3036.jpg"},{"id":265486,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/sir/2012/5040","text":"SIR 2012-5040"},{"id":265487,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3032","text":"FS 2012-3032"},{"id":265488,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3033","text":"FS 2012-3033"},{"id":265484,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/fs/2012/3036/"},{"id":265485,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/fs/2012/3036/pdf/fs20123036.pdf"},{"id":265489,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3034","text":"FS 2012-3034"},{"id":265490,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3035","text":"FS 2012-3035"},{"id":265491,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3098","text":"FS 2012-3098"}],"country":"United States","state":"California","otherGeospatial":"Mojave","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -117.75,34.25 ], [ -117.75,35.25 ], [ -116.25,35.25 ], [ -116.25,34.25 ], [ -117.75,34.25 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"50ee9173e4b0160a2d0ee33b","contributors":{"authors":[{"text":"Dawson, Barbara J. 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Milby","affiliations":[],"preferred":false,"id":471584,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Belitz, Kenneth 0000-0003-4481-2345 kbelitz@usgs.gov","orcid":"https://orcid.org/0000-0003-4481-2345","contributorId":442,"corporation":false,"usgs":true,"family":"Belitz","given":"Kenneth","email":"kbelitz@usgs.gov","affiliations":[{"id":503,"text":"Office of Water Quality","active":true,"usgs":true},{"id":376,"text":"Massachusetts Water Science Center","active":true,"usgs":true},{"id":451,"text":"National Water Quality Assessment Program","active":true,"usgs":true},{"id":27111,"text":"National Water Quality Program","active":true,"usgs":true},{"id":466,"text":"New England Water Science Center","active":true,"usgs":true}],"preferred":true,"id":471583,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70042455,"text":"fs20123032 - 2012 - Groundwater quality in the Owens Valley, California","interactions":[],"lastModifiedDate":"2013-01-09T15:04:31","indexId":"fs20123032","displayToPublicDate":"2013-01-09T00:00:00","publicationYear":"2012","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":313,"text":"Fact Sheet","code":"FS","onlineIssn":"2327-6932","printIssn":"2327-6916","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2012-3032","title":"Groundwater quality in the Owens Valley, California","docAbstract":"Groundwater provides more than 40 percent of California’s drinking water. To protect this vital resource, the State of California created the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The Priority Basin Project of the GAMA Program provides a comprehensive assessment of the State’s groundwater quality and increases public access to groundwater-quality information. Owens Valley is one of the study areas being evaluated. The Owens study area is approximately 1,030 square miles (2,668 square kilometers) and includes the Owens Valley groundwater basin (California Department of Water Resources, 2003). Owens Valley has a semiarid to arid climate, with average annual rainfall of about 6 inches (15 centimeters). The study area has internal drainage, with runoff primarily from the Sierra Nevada draining east to the Owens River, which flows south to Owens Lake dry lakebed at the southern end of the valley. Beginning in the early 1900s, the City of Los Angeles began diverting the flow of the Owens River to the Los Angeles Aqueduct, resulting in the evaporation of Owens Lake and the formation of the current Owens Lake dry lakebed. Land use in the study area is approximately 94 percent (%) natural, 5% agricultural, and 1% urban. The primary natural land cover is shrubland. The largest urban area is the city of Bishop (2010 population of 4,000). Groundwater in this basin is used for public and domestic water supply and for irrigation. The main water-bearing units are gravel, sand, silt, and clay derived from surrounding mountains. Recharge to the groundwater system is primarily runoff from the Sierra Nevada, and by direct infiltration of irrigation. The primary sources of discharge are pumping wells, evapotranspiration, and underflow to the Owens Lake dry lakebed. The primary aquifers in Owens Valley are defined as those parts of the aquifers corresponding to the perforated intervals of wells listed in the California Department of Public Health database. Public-supply wells in Owens Valley are completed to depths between 210 and 480 feet (64 to 146 meters), consist of solid casing from the land surface to a depth of 50 to 80 feet (15 to 24 meters), and are screened or perforated below the solid casing.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/fs20123032","collaboration":"U.S. Geological Survey and the California State Water Resources Control Board. This report has related reports. Please see: SIR 2012-5040, FS 2012-3033, FS 2012-3034, FS 2012-3035, FS 2012-3036, FS 2012-3098.","usgsCitation":"Dawson, B.J., and Belitz, K., 2012, Groundwater quality in the Owens Valley, California: U.S. Geological Survey Fact Sheet 2012-3032, Report: 4 p.; Related Reports: SIR 2012-5040, FS 2012-3033, FS 2012-3034, FS 2012-3035, FS 2012-3036, FS 2012-3098, https://doi.org/10.3133/fs20123032.","productDescription":"Report: 4 p.; Related Reports: SIR 2012-5040, FS 2012-3033, FS 2012-3034, FS 2012-3035, FS 2012-3036, FS 2012-3098","additionalOnlineFiles":"Y","costCenters":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"links":[{"id":265430,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/sir/2012/5040/"},{"id":265431,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3033"},{"id":265428,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/fs/2012/3032/"},{"id":265429,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/fs/2012/3032/pdf/fs20123032.pdf"},{"id":265432,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3034"},{"id":265433,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3035"},{"id":265434,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3036"},{"id":265435,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3098"},{"id":265436,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/fs_2012_3032.jpg"}],"country":"United States","state":"California","otherGeospatial":"Owens Valley","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -118.75,36.0 ], [ -118.75,38.0 ], [ -117.5,38.0 ], [ -117.5,36.0 ], [ -118.75,36.0 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"50ee9174e4b0160a2d0ee33f","contributors":{"authors":[{"text":"Dawson, Barbara J. Milby 0000-0002-0209-8158","orcid":"https://orcid.org/0000-0002-0209-8158","contributorId":57334,"corporation":false,"usgs":true,"family":"Dawson","given":"Barbara","email":"","middleInitial":"J. Milby","affiliations":[],"preferred":false,"id":471582,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Belitz, Kenneth 0000-0003-4481-2345 kbelitz@usgs.gov","orcid":"https://orcid.org/0000-0003-4481-2345","contributorId":442,"corporation":false,"usgs":true,"family":"Belitz","given":"Kenneth","email":"kbelitz@usgs.gov","affiliations":[{"id":376,"text":"Massachusetts Water Science Center","active":true,"usgs":true},{"id":503,"text":"Office of Water Quality","active":true,"usgs":true},{"id":451,"text":"National Water Quality Assessment Program","active":true,"usgs":true},{"id":466,"text":"New England Water Science Center","active":true,"usgs":true},{"id":27111,"text":"National Water Quality Program","active":true,"usgs":true}],"preferred":true,"id":471581,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70042464,"text":"fs20123033 - 2012 - Groundwater quality in the Antelope Valley, California","interactions":[],"lastModifiedDate":"2013-01-09T15:05:38","indexId":"fs20123033","displayToPublicDate":"2013-01-09T00:00:00","publicationYear":"2012","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":313,"text":"Fact Sheet","code":"FS","onlineIssn":"2327-6932","printIssn":"2327-6916","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2012-3033","title":"Groundwater quality in the Antelope Valley, California","docAbstract":"Groundwater provides more than 40 percent of California’s drinking water. To protect this vital resource, the State of California created the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The Priority Basin Project of the GAMA Program provides a comprehensive assessment of the State’s groundwater quality and increases public access to groundwater-quality information. Antelope Valley is one of the study areas being evaluated. The Antelope study area is approximately 1,600 square miles (4,144 square kilometers) and includes the Antelope Valley groundwater basin (California Department of Water Resources, 2003). Antelope Valley has an arid climate and is part of the Mojave Desert. Average annual rainfall is about 6 inches (15 centimeters). The study area has internal drainage, with runoff from the surrounding mountains draining towards dry lakebeds in the lower parts of the valley. Land use in the study area is approximately 68 percent (%) natural (mostly shrubland and grassland), 24% agricultural, and 8% urban. The primary crops are pasture and hay. The largest urban areas are the cities of Palmdale and Lancaster (2010 populations of 152,000 and 156,000, respectively). Groundwater in this basin is used for public and domestic water supply and for irrigation. The main water-bearing units are gravel, sand, silt, and clay derived from surrounding mountains. The primary aquifers in Antelope Valley are defined as those parts of the aquifers corresponding to the perforated intervals of wells listed in the California Department of Public Health database. Public-supply wells in Antelope Valley are completed to depths between 360 and 700 feet (110 to 213 meters), consist of solid casing from the land surface to a depth of 180 to 350 feet (55 to 107 meters), and are screened or perforated below the solid casing. Recharge to the groundwater system is primarily runoff from the surrounding mountains, and by direct infiltration of irrigation and sewer and septic systems. The primary sources of discharge are pumping wells and evapotranspiration near the dry lakebeds.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/fs20123033","collaboration":"U.S. Geological Survey and the California State Water Resources Control Board. This report has related reports. Please see: SIR 2012-5040, FS 2012-3032, FS 2012-3034, FS 2012-3035, FS 2012-3036, FS 2012-3098.","usgsCitation":"Dawson, B.J., and Belitz, K., 2012, Groundwater quality in the Antelope Valley, California: U.S. Geological Survey Fact Sheet 2012-3033, Report: 4 p.; Related Reports: SIR 2012-5040, FS 2012-3032, FS 2012-3034, FS 2012-3035, FS 2012-3036, FS 2012-3098, https://doi.org/10.3133/fs20123033.","productDescription":"Report: 4 p.; Related Reports: SIR 2012-5040, FS 2012-3032, FS 2012-3034, FS 2012-3035, FS 2012-3036, FS 2012-3098","additionalOnlineFiles":"Y","costCenters":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"links":[{"id":265445,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/fs_2012_3033.jpg"},{"id":265437,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/fs/2012/3033/"},{"id":265438,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/fs/2012/3033/pdf/fs20123033.pdf"},{"id":265439,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/sir/2012/5040/"},{"id":265440,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3032"},{"id":265441,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3034"},{"id":265442,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3035"},{"id":265443,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3036"},{"id":265444,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3098"}],"country":"United States","state":"California","otherGeospatial":"Antelope Valley","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -118.75,34.25 ], [ -118.75,35.25 ], [ -117.5,35.25 ], [ -117.5,34.25 ], [ -118.75,34.25 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"50ee9170e4b0160a2d0ee32f","contributors":{"authors":[{"text":"Dawson, Barbara J. Milby 0000-0002-0209-8158","orcid":"https://orcid.org/0000-0002-0209-8158","contributorId":57334,"corporation":false,"usgs":true,"family":"Dawson","given":"Barbara","email":"","middleInitial":"J. Milby","affiliations":[],"preferred":false,"id":471594,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Belitz, Kenneth 0000-0003-4481-2345 kbelitz@usgs.gov","orcid":"https://orcid.org/0000-0003-4481-2345","contributorId":442,"corporation":false,"usgs":true,"family":"Belitz","given":"Kenneth","email":"kbelitz@usgs.gov","affiliations":[{"id":466,"text":"New England Water Science Center","active":true,"usgs":true},{"id":376,"text":"Massachusetts Water Science Center","active":true,"usgs":true},{"id":503,"text":"Office of Water Quality","active":true,"usgs":true},{"id":27111,"text":"National Water Quality Program","active":true,"usgs":true},{"id":451,"text":"National Water Quality Assessment Program","active":true,"usgs":true}],"preferred":true,"id":471593,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70042466,"text":"fs20123035 - 2012 - Groundwater quality in the Indian Wells Valley, California","interactions":[],"lastModifiedDate":"2013-01-09T15:11:56","indexId":"fs20123035","displayToPublicDate":"2013-01-09T00:00:00","publicationYear":"2012","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":313,"text":"Fact Sheet","code":"FS","onlineIssn":"2327-6932","printIssn":"2327-6916","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2012-3035","title":"Groundwater quality in the Indian Wells Valley, California","docAbstract":"Groundwater provides more than 40 percent of California’s drinking water. To protect this vital resource, the State of California created the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The Priority Basin Project of the GAMA Program provides a comprehensive assessment of the State’s groundwater quality and increases public access to groundwater-quality information. Indian Wells Valley is one of the study areas being evaluated. The Indian Wells study area is approximately 600 square miles (1,554 square kilometers) and includes the Indian Wells Valley groundwater basin (California Department of Water Resources, 2003). Indian Wells Valley has an arid climate and is part of the Mojave Desert. Average annual rainfall is about 6 inches (15 centimeters). The study area has internal drainage, with runoff from the surrounding mountains draining towards dry lake beds in the lower parts of the valley. Land use in the study area is approximately 97.0 percent (%) natural, 0.4% agricultural, and 2.6% urban. The primary natural land cover is shrubland. The largest urban area is the city of Ridgecrest (2010 population of 28,000). Groundwater in this basin is used for public and domestic water supply and for irrigation. The main water-bearing units are gravel, sand, silt, and clay derived from the Sierra Nevada to the west and from the other surrounding mountains. Recharge to the groundwater system is primarily runoff from the Sierra Nevada and to the west and from the other surrounding mountains. Recharge to the groundwater system is primarily runoff from the Sierra Nevada and direct infiltration from irrigation and septic systems. The primary sources of discharge are pumping wells and evapotranspiration near the dry lakebeds. The primary aquifers in the Indian Wells study area are defined as those parts of the aquifers corresponding to the perforated intervals of wells listed in the California Department of Public Health database. Public-supply wells in Indian Wells Valley are completed to depths between 240 and 800 feet (73 to 244 meters), consist of solid casing from the land surface to a depth of 180 to 260 feet (55 to 79 meters), and are screened or perforated below the solid casing.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/fs20123035","collaboration":"U.S. Geological Survey and the California State Water Resources Control Board. This report has related reports. Please see: SIR 2012-5040, FS 2012-3032, FS 2012-3033, FS 2012-3034, FS 2012-3036, FS 2012-3098.","usgsCitation":"Dawson, B.J., and Belitz, K., 2012, Groundwater quality in the Indian Wells Valley, California: U.S. Geological Survey Fact Sheet 2012-3035, Report: 4 p.; Related Reports: SIR 2012-5040, FS 2012-3032, FS 2012-3033, FS 2012-3034, FS 2012-3036, FS 2012-3098, https://doi.org/10.3133/fs20123035.","productDescription":"Report: 4 p.; Related Reports: SIR 2012-5040, FS 2012-3032, FS 2012-3033, FS 2012-3034, FS 2012-3036, FS 2012-3098","additionalOnlineFiles":"Y","costCenters":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"links":[{"id":265463,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/fs_2012_3035.jpg"},{"id":265457,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/sir/2012/5040/"},{"id":265458,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3032"},{"id":265459,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3033"},{"id":265460,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3034"},{"id":265461,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3036"},{"id":265462,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3098"},{"id":265455,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/fs/2012/3035/"},{"id":265456,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/fs/2012/3035/pdf/fs20123035.pdf"}],"country":"United States","state":"California","otherGeospatial":"Indian Wells Valley","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -118.25,35.25 ], [ -118.25,36.0 ], [ -117.25,36.0 ], [ -117.25,35.25 ], [ -118.25,35.25 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"50ee9171e4b0160a2d0ee337","contributors":{"authors":[{"text":"Dawson, Barbara J. Milby 0000-0002-0209-8158","orcid":"https://orcid.org/0000-0002-0209-8158","contributorId":57334,"corporation":false,"usgs":true,"family":"Dawson","given":"Barbara","email":"","middleInitial":"J. Milby","affiliations":[],"preferred":false,"id":471598,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Belitz, Kenneth 0000-0003-4481-2345 kbelitz@usgs.gov","orcid":"https://orcid.org/0000-0003-4481-2345","contributorId":442,"corporation":false,"usgs":true,"family":"Belitz","given":"Kenneth","email":"kbelitz@usgs.gov","affiliations":[{"id":466,"text":"New England Water Science Center","active":true,"usgs":true},{"id":376,"text":"Massachusetts Water Science Center","active":true,"usgs":true},{"id":27111,"text":"National Water Quality Program","active":true,"usgs":true},{"id":451,"text":"National Water Quality Assessment Program","active":true,"usgs":true},{"id":503,"text":"Office of Water Quality","active":true,"usgs":true}],"preferred":true,"id":471597,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70042465,"text":"fs20123034 - 2012 - Groundwater quality in the Colorado River basins, California","interactions":[],"lastModifiedDate":"2013-01-09T15:11:28","indexId":"fs20123034","displayToPublicDate":"2013-01-09T00:00:00","publicationYear":"2012","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":313,"text":"Fact Sheet","code":"FS","onlineIssn":"2327-6932","printIssn":"2327-6916","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2012-3034","title":"Groundwater quality in the Colorado River basins, California","docAbstract":"Groundwater provides more than 40 percent of California’s drinking water. To protect this vital resource, the State of California created the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The Priority Basin Project of the GAMA Program provides a comprehensive assessment of the State’s groundwater quality and increases public access to groundwater-quality information. Four groundwater basins along the Colorado River make up one of the study areas being evaluated. The Colorado River study area is approximately 884 square miles (2,290 square kilometers) and includes the Needles, Palo Verde Mesa, Palo Verde Valley, and Yuma groundwater basins (California Department of Water Resources, 2003). The Colorado River study area has an arid climate and is part of the Sonoran Desert. Average annual rainfall is about 3 inches (8 centimeters). Land use in the study area is approximately 47 percent (%) natural (mostly shrubland), 47% agricultural, and 6% urban. The primary crops are pasture and hay. The largest urban area is the city of Blythe (2010 population of 21,000). Groundwater in these basins is used for public and domestic water supply and for irrigation. The main water-bearing units are gravel, sand, silt, and clay deposited by the Colorado River or derived from surrounding mountains. The primary aquifers in the Colorado River study area are defined as those parts of the aquifers corresponding to the perforated intervals of wells listed in the California Department of Public Health database. Public-supply wells in the Colorado River basins are completed to depths between 230 and 460 feet (70 to 140 meters), consist of solid casing from the land surface to a depth of 130 of 390 feet (39 to 119 meters), and are screened or perforated below the solid casing. The main source of recharge to the groundwater systems in the Needles, Palo Verde Mesa, and Palo Verde Valley basins is the Colorado River; in the Yuma basin, the main source of recharge is from subsurface flow from the groundwater basins to the west. Groundwater discharge is primarily to pumping wells, evapotranspiration, and, locally, to the Colorado River.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/fs20123034","collaboration":"U.S. Geological Survey and the California State Water Resources Control Board. This report has related reports. Please see: SIR 2012-5040, FS 2012-3032, FS 2012-3033, FS 2012-3035, FS 2012-3036, FS 2012-3098.","usgsCitation":"Dawson, B.J., and Belitz, K., 2012, Groundwater quality in the Colorado River basins, California: U.S. Geological Survey Fact Sheet 2012-3034, Report: 4 p.; Related Reports: SIR 2012-5040, FS 2012-3032, FS 2012-3033, FS 2012-3035, FS 2012-3036, FS 2012-3098, https://doi.org/10.3133/fs20123034.","productDescription":"Report: 4 p.; Related Reports: SIR 2012-5040, FS 2012-3032, FS 2012-3033, FS 2012-3035, FS 2012-3036, FS 2012-3098","additionalOnlineFiles":"Y","costCenters":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"links":[{"id":265454,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/fs_2012_3034.jpg"},{"id":265448,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/sir/2012/5040/"},{"id":265449,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3032"},{"id":265450,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3033"},{"id":265451,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3035"},{"id":265452,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3036"},{"id":265453,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3098"},{"id":265446,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/fs/2012/3034/"},{"id":265447,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/fs/2012/3034/pdf/fs20123034.pdf"}],"country":"United States","state":"Arizona;California","otherGeospatial":"Colorado River","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -114.933333,33.008333 ], [ -114.933333,35.054167 ], [ -113.916667,35.054167 ], [ -113.916667,33.008333 ], [ -114.933333,33.008333 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"50ee9170e4b0160a2d0ee333","contributors":{"authors":[{"text":"Dawson, Barbara J. Milby 0000-0002-0209-8158","orcid":"https://orcid.org/0000-0002-0209-8158","contributorId":57334,"corporation":false,"usgs":true,"family":"Dawson","given":"Barbara","email":"","middleInitial":"J. Milby","affiliations":[],"preferred":false,"id":471596,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Belitz, Kenneth 0000-0003-4481-2345 kbelitz@usgs.gov","orcid":"https://orcid.org/0000-0003-4481-2345","contributorId":442,"corporation":false,"usgs":true,"family":"Belitz","given":"Kenneth","email":"kbelitz@usgs.gov","affiliations":[{"id":376,"text":"Massachusetts Water Science Center","active":true,"usgs":true},{"id":27111,"text":"National Water Quality Program","active":true,"usgs":true},{"id":451,"text":"National Water Quality Assessment Program","active":true,"usgs":true},{"id":503,"text":"Office of Water Quality","active":true,"usgs":true},{"id":466,"text":"New England Water Science Center","active":true,"usgs":true}],"preferred":true,"id":471595,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70042468,"text":"sir20125040 - 2012 - Status of groundwater quality in the California Desert Region, 2006-2008: California GAMA Priority Basin Project","interactions":[],"lastModifiedDate":"2013-01-09T15:13:55","indexId":"sir20125040","displayToPublicDate":"2013-01-09T00:00:00","publicationYear":"2012","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":334,"text":"Scientific Investigations Report","code":"SIR","onlineIssn":"2328-0328","printIssn":"2328-031X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2012-5040","title":"Status of groundwater quality in the California Desert Region, 2006-2008: California GAMA Priority Basin Project","docAbstract":"Groundwater quality in six areas in the California Desert Region (Owens, Antelope, Mojave, Coachella, Colorado River, and Indian Wells) was investigated as part of the Priority Basin Project of the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The GAMA Priority Basin Project is being conducted by the California State Water Resources Control Board in collaboration with the U.S. Geological Survey (USGS) and the Lawrence Livermore National Laboratory. The six Desert studies were designed to provide a spatially unbiased assessment of the quality of untreated groundwater in parts of the Desert and the Basin and Range hydrogeologic provinces, as well as a statistically consistent basis for comparing groundwater quality to other areas in California and across the Nation. Samples were collected by the USGS from September 2006 through April 2008 from 253 wells in Imperial, Inyo, Kern, Los Angeles, Mono, Riverside, and San Bernardino Counties. Two-hundred wells were selected using a spatially distributed, randomized grid-based method to provide a spatially unbiased representation of the study areas (grid wells), and fifty-three wells were sampled to provide additional insight into groundwater conditions (additional wells). The status of the current quality of the groundwater resource was assessed based on data from samples analyzed for volatile organic compounds (VOCs), pesticides, and inorganic constituents such as major ions and trace elements. Water-quality data from the California Department of Public Health (CDPH) database also were incorporated in the assessment. The status assessment is intended to characterize the quality of untreated groundwater resources within the primary aquifer systems of the Desert Region, not the treated drinking water delivered to consumers by water purveyors. The primary aquifer systems (hereinafter, primary aquifers) in the six Desert areas are defined as that part of the aquifer corresponding to the perforation intervals of wells listed in the CDPH database. Relative-concentrations (sample concentration divided by the benchmark concentration) were used as the primary metric for evaluating groundwater quality for those constituents that have Federal and (or) California benchmarks. A relative-concentration (RC) greater than (>) 1.0 indicates a concentration above a benchmark, and an RC less than or equal to (≤) 1.0 indicates a concentration equal to or below a benchmark. Organic and special-interest constituent RCs were classified as “low” (RC ≤ 0.1), “moderate” (0.1 < RC ≤ 1.0), or “high” (RC > 1.0). Inorganic constituent RCs were classified as “low” (RC ≤ 0.5), “moderate” (0.5 < RC ≤ 1.0), or “high” (RC > 1.0). A lower threshold value RC was used to distinguish between low and moderate RCs for organic constituents because these constituents are generally less prevalent and have smaller RCs than inorganic constituents. Aquifer-scale proportion was used as the primary metric for evaluating regional-scale groundwater quality. High aquifer-scale proportion was defined as the percentage of the area of the primary aquifers with an RC greater than 1.0 for a particular constituent or class of constituents; percentage is based on an areal rather than a volumetric basis. Moderate and low aquifer-scale proportions were defined as the percentage of the primary aquifers with moderate and low RCs, respectively. Two statistical approaches—grid-based and spatially weighted—were used to evaluate aquifer-scale proportions for individual constituents and classes of constituents. Grid-based and spatially weighted estimates were comparable in the Desert Region (within 90 percent confidence intervals). The status assessment determined that one or more inorganic constituents with health-based benchmarks had high RCs in 35.4 percent of the Desert Region’s primary aquifers, moderate RCs in 27.4 percent, and low RCs in 37.2 percent. The inorganic constituents with health-based benchmarks having the largest high aquifer-scale proportions were arsenic (17.8 percent), boron (11.4 percent), fluoride (8.9 percent), gross-alpha radioactivity (6.6 percent), molybdenum (5.7 percent), strontium (3.7 percent), vanadium (3.6 percent), uranium (3.2 percent), and perchlorate (2.4 percent). Inorganic constituents with non-health-based benchmarks were also detected at high RCs in 18.6 percent and at moderate RCs in 16.0 percent of the Desert Region’s primary aquifers. In contrast, organic constituents had high RCs in only 0.3 percent of the Desert Region’s primary aquifers, moderate in 2.0 percent, low in 48.0 percent, and were not detected in 49.7 percent of the primary aquifers in the Desert Region. Of 149 organic constituents analyzed for all six study areas, 42 constituents were detected. Six organic constituents, carbon tetrachloride, chloroform, 1,2-dichloropropane, dieldrin, 1,2-dichloroethane, and tetrachloroethene, were found at moderate RCs in one or more of the grid wells. One constituent, N-nitrosodimethylamine, a special-interest VOC, was detected at a high RC in one well. Thirty-nine organic constituents were detected only at low concentrations. Three organic constituents were frequently detected (in more than 10 percent of samples from grid wells): chloroform, simazine, and deethylatrazine.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/sir20125040","collaboration":"Prepared in cooperation with the California State Water Resources Control Board. A product of the California Groundwater Ambient Monitoring and Assessment (GAMA) Program. This report has related reports. Please see: FS 2012-3032, FS 2012-3033, FS 2012-3034, FS 2012-3035, FS 2012-3036, FS 2012-3098.","usgsCitation":"Dawson, B.J., and Belitz, K., 2012, Status of groundwater quality in the California Desert Region, 2006-2008: California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2012-5040, Report: viii, 110 p.; Related Reports: FS 2012-3032, FS 2012-3033, FS 2012-3034, FS 2012-3035, FS 2012-3036, FS 2012-3098, https://doi.org/10.3133/sir20125040.","productDescription":"Report: viii, 110 p.; Related Reports: FS 2012-3032, FS 2012-3033, FS 2012-3034, FS 2012-3035, FS 2012-3036, FS 2012-3098","numberOfPages":"122","additionalOnlineFiles":"Y","costCenters":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"links":[{"id":265481,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/sir_2012_5040.jpg"},{"id":265475,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3032"},{"id":265476,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3033"},{"id":265478,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3036"},{"id":265477,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3035"},{"id":265479,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3034"},{"id":265480,"type":{"id":22,"text":"Related Work"},"url":"https://pubs.usgs.gov/fs/2012/3098"},{"id":265473,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/sir/2012/5040/"},{"id":265474,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/sir/2012/5040/pdf/sir20125040.pdf"}],"projection":"Albers Equal Area Conic Projection","country":"United States","state":"California","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -121.0,32.5 ], [ -121.0,38.0 ], [ -114.0,38.0 ], [ -114.0,32.5 ], [ -121.0,32.5 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"50ee9176e4b0160a2d0ee347","contributors":{"authors":[{"text":"Dawson, Barbara J. 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Milby","affiliations":[],"preferred":false,"id":471602,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Belitz, Kenneth 0000-0003-4481-2345 kbelitz@usgs.gov","orcid":"https://orcid.org/0000-0003-4481-2345","contributorId":442,"corporation":false,"usgs":true,"family":"Belitz","given":"Kenneth","email":"kbelitz@usgs.gov","affiliations":[{"id":451,"text":"National Water Quality Assessment Program","active":true,"usgs":true},{"id":376,"text":"Massachusetts Water Science Center","active":true,"usgs":true},{"id":503,"text":"Office of Water Quality","active":true,"usgs":true},{"id":466,"text":"New England Water Science Center","active":true,"usgs":true},{"id":27111,"text":"National Water Quality Program","active":true,"usgs":true}],"preferred":true,"id":471601,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70042357,"text":"sir20125269 - 2012 - Sediment transport to and from small impoundments in northeast Kansas, March 2009 through September 2011","interactions":[],"lastModifiedDate":"2013-01-17T11:22:10","indexId":"sir20125269","displayToPublicDate":"2013-01-08T00:00:00","publicationYear":"2012","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":334,"text":"Scientific Investigations Report","code":"SIR","onlineIssn":"2328-0328","printIssn":"2328-031X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2012-5269","title":"Sediment transport to and from small impoundments in northeast Kansas, March 2009 through September 2011","docAbstract":"The U.S. Geological Survey, in cooperation with the Kansas Water Office, investigated sediment transport to and from three small impoundments (average surface area of 0.1 to 0.8 square miles) in northeast Kansas during March 2009 through September 2011. Streamgages and continuous turbidity sensors were operated upstream and downstream from Atchison County, Banner Creek, and Centralia Lakes to study the effect of varied watershed characteristics and agricultural practices on sediment transport in small watersheds in northeast Kansas. Atchison County Lake is located in a predominantly agricultural basin of row crops, with wide riparian buffers along streams, a substantial amount of tile drainage, and numerous small impoundments (less than 0.05 square miles; hereafter referred to as “ponds”). Banner Creek Lake is a predominantly grassland basin with numerous small ponds located in the watershed, and wide riparian buffers along streams. Centralia Lake is a predominantly agricultural basin of row crops with few ponds, few riparian buffers along streams, and minimal tile drainage. Upstream from Atchison County, Banner Creek, and Centralia Lakes 24, 38, and 32 percent, respectively, of the total load was transported during less than 0.1 percent (approximately 0.9 days) of the time. Despite less streamflow in 2011, larger sediment loads during that year indicate that not all storm events transport the same amount of sediment; larger, extreme storms during the spring may transport much larger sediment loads in small Kansas watersheds. Annual sediment yields were 360, 400, and 970 tons per square mile per year at Atchison County, Banner, and Centralia Lake watersheds, respectively, which were less than estimated yields for this area of Kansas (between 2,000 and 5,000 tons per square mile per year). Although Centralia and Atchison County Lakes had similar percentages of agricultural land use, mean annual sediment yields upstream from Centralia Lake were about 2.7 times those at Atchison County or Banner Creek Lakes. These data indicate larger yields of sediment from watersheds with row crops and those with fewer small ponds, and smaller yields in watersheds which are primarily grassland, or agricultural with substantial tile drainage and riparian buffers along streams. These results also indicated that a cultivated watershed can produce yields similar to those observed under the assumed reference (or natural) condition. Selected small ponds were studied in the Atchison County Lake watershed to characterize the role of small ponds in sediment trapping. Studied ponds trapped about 8 percent of the sediment upstream from the sediment-sampling site. When these results were extrapolated to the other ponds in the watershed, differences in the extent of these ponds was not the primary factor affecting differences in yields among the three watersheds. However, the selected small ponds were both 45 years old at the time of this study, and have reduced capacity because of being filled in with sediments. Additionally, trapping efficiency of these small ponds decreased over five observed storms, indicating that processes that suspended or resuspended sediments in these shallow ponds, such as wind and waves, affected their trapping efficiencies. While small ponds trapped sediments in small storms, they could be a source of sediment in larger or more closely spaced storm events. Channel slope was similar at all three watersheds, 0.40, 0.46, and 0.31 percent at Atchison County, Banner Creek, and Centralia Lake watersheds, respectively. Other factors, such as increased bank and stream erosion, differences in tile drainage, extent of grassland, or riparian buffers, could be the predominant factors affecting sediment yields from these basins. These results show that reference-like sediment yields may be observed in heavily agricultural watersheds through a combination of field-scale management activities and stream channel protection. When computing loads using published erosion rates obtained by single-point survey methodology, streambank contributions from the main stem of Banner Creek are three times more than the sediment load observed by this study at the sediment sampling site at Banner Creek, 2.6 times more than the sediment load observed by this study at the sediment sampling site at Clear Creek (upstream from Atchison County Lake), and are 22 percent of the load observed by this study at the sediment sampling site at Black Vermillion River above Centralia Lake. Comparisons of study sites to similarly sized urban and urbanizing watersheds in Johnson County, Kansas indicated that sediment yields from the Centralia Lake watershed were similar to those in construction-affected watersheds, while much smaller sediment yields in the Atchison County and Banner Creek watersheds were comparable to stable, heavily urbanized watersheds. Comparisons of study sites to larger watersheds upstream from Tuttle Creek Lake indicate the Black Vermillion River watershed continues to have high sediment yields despite 98 percent of sediment from the Centralia watershed (a headwater of the Black Vermillion River) being trapped in Centralia Lake. Estimated trapping efficiencies for the larger watershed lakes indicated that Banner Creek and Centralia Lakes trapped 98 percent of incoming sediment, whereas Atchison County Lake trapped 72 percent of incoming sediment during the 3-year study period.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/sir20125269","collaboration":"Prepared in cooperation with the Kansas Water Office","usgsCitation":"Foster, G., Lee, C., and Ziegler, A., 2012, Sediment transport to and from small impoundments in northeast Kansas, March 2009 through September 2011: U.S. Geological Survey Scientific Investigations Report 2012-5269, vi, 38 p., https://doi.org/10.3133/sir20125269.","productDescription":"vi, 38 p.","numberOfPages":"48","onlineOnly":"Y","temporalStart":"2009-03-01","temporalEnd":"2011-09-30","ipdsId":"IP-035289","costCenters":[{"id":353,"text":"Kansas Water Science Center","active":false,"usgs":true}],"links":[{"id":265371,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/sir_2012_5269.gif"},{"id":265370,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/sir/2012/5269/"},{"id":265369,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/sir/2012/5269/sir12-5269.pdf"}],"country":"United States","state":"Kansas","county":"Atchison;Brown;Doniphan;Jackson;Jefferson;Marshall;Nemaha;Pottawatomie","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -96.333333,39.366667 ], [ -96.333333,39.8 ], [ -95.25,39.8 ], [ -95.25,39.366667 ], [ -96.333333,39.366667 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"50ed3fe1e4b0438b00db0746","contributors":{"authors":[{"text":"Foster, Guy M. gfoster@usgs.gov","contributorId":3437,"corporation":false,"usgs":true,"family":"Foster","given":"Guy M.","email":"gfoster@usgs.gov","affiliations":[{"id":353,"text":"Kansas Water Science Center","active":false,"usgs":true}],"preferred":false,"id":471375,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Lee, Casey J. 0000-0002-5753-2038","orcid":"https://orcid.org/0000-0002-5753-2038","contributorId":31062,"corporation":false,"usgs":true,"family":"Lee","given":"Casey J.","affiliations":[],"preferred":false,"id":471376,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Ziegler, Andrew C. aziegler@usgs.gov","contributorId":433,"corporation":false,"usgs":true,"family":"Ziegler","given":"Andrew C.","email":"aziegler@usgs.gov","affiliations":[{"id":353,"text":"Kansas Water Science Center","active":false,"usgs":true}],"preferred":false,"id":471374,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70042329,"text":"70042329 - 2012 - Understanding the role of ecohydrological feedbacks in ecosystem state change in drylands","interactions":[],"lastModifiedDate":"2013-01-10T15:47:55","indexId":"70042329","displayToPublicDate":"2013-01-07T00:00:00","publicationYear":"2012","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1447,"text":"Ecohydrology","active":true,"publicationSubtype":{"id":10}},"title":"Understanding the role of ecohydrological feedbacks in ecosystem state change in drylands","docAbstract":"Ecohydrological feedbacks are likely to be critical for understanding the mechanisms by which changes in exogenous forces result in ecosystem state change. We propose that in drylands, the dynamics of ecosystem state change are determined by changes in the type (stabilizing vs amplifying) and strength of ecohydrological feedbacks following a change in exogenous forces. Using a selection of five case studies from drylands, we explore the characteristics of ecohydrological feedbacks and resulting dynamics of ecosystem state change. We surmise that stabilizing feedbacks are critical for the provision of plant-essential resources in drylands. Exogenous forces that break these stabilizing feedbacks can alter the state of the system, although such changes are potentially reversible if strong amplifying ecohydrological feedbacks do not develop. The case studies indicate that if amplifying ecohydrological feedbacks do develop, they are typically associated with abiotic processes such as runoff, erosion (by wind and water), and fire. These amplifying ecohydrological feedbacks progressively modify the system in ways that are long-lasting and possibly irreversible on human timescales.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Ecohydrology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"Wiley","publisherLocation":"Hoboken, NJ","doi":"10.1002/eco.265","usgsCitation":"Turnbull, L., Wilcox, B., Belnap, J., Ravi, S., D’Odorico, P., Childers, D., Gwenzi, W., Okin, G., Wainwright, J., Caylor, K., and Sankey, T., 2012, Understanding the role of ecohydrological feedbacks in ecosystem state change in drylands: Ecohydrology, v. 5, no. 2, p. 174-183, https://doi.org/10.1002/eco.265.","productDescription":"10 p.","startPage":"174","endPage":"183","numberOfPages":"10","ipdsId":"IP-029337","costCenters":[{"id":568,"text":"Southwest Biological Science Center","active":true,"usgs":true}],"links":[{"id":474106,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1002/eco.265","text":"Publisher Index Page"},{"id":265524,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1002/eco.265"},{"id":265526,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","volume":"5","issue":"2","noUsgsAuthors":false,"publicationDate":"2011-11-25","publicationStatus":"PW","scienceBaseUri":"53cd7a32e4b0b2908510d537","contributors":{"authors":[{"text":"Turnbull, L.","contributorId":74649,"corporation":false,"usgs":true,"family":"Turnbull","given":"L.","email":"","affiliations":[],"preferred":false,"id":471293,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wilcox, B.P.","contributorId":83490,"corporation":false,"usgs":true,"family":"Wilcox","given":"B.P.","email":"","affiliations":[],"preferred":false,"id":471294,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Belnap, J. 0000-0001-7471-2279","orcid":"https://orcid.org/0000-0001-7471-2279","contributorId":23872,"corporation":false,"usgs":true,"family":"Belnap","given":"J.","affiliations":[],"preferred":false,"id":471288,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Ravi, S.","contributorId":45977,"corporation":false,"usgs":true,"family":"Ravi","given":"S.","affiliations":[],"preferred":false,"id":471290,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"D’Odorico, P.","contributorId":56528,"corporation":false,"usgs":true,"family":"D’Odorico","given":"P.","email":"","affiliations":[],"preferred":false,"id":471291,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Childers, D.","contributorId":86654,"corporation":false,"usgs":true,"family":"Childers","given":"D.","email":"","affiliations":[],"preferred":false,"id":471295,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Gwenzi, W.","contributorId":43242,"corporation":false,"usgs":true,"family":"Gwenzi","given":"W.","email":"","affiliations":[],"preferred":false,"id":471289,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Okin, G.","contributorId":64963,"corporation":false,"usgs":true,"family":"Okin","given":"G.","affiliations":[],"preferred":false,"id":471292,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Wainwright, J.","contributorId":19046,"corporation":false,"usgs":true,"family":"Wainwright","given":"J.","email":"","affiliations":[],"preferred":false,"id":471287,"contributorType":{"id":1,"text":"Authors"},"rank":9},{"text":"Caylor, K.K.","contributorId":15820,"corporation":false,"usgs":true,"family":"Caylor","given":"K.K.","email":"","affiliations":[],"preferred":false,"id":471285,"contributorType":{"id":1,"text":"Authors"},"rank":10},{"text":"Sankey, T.","contributorId":16287,"corporation":false,"usgs":true,"family":"Sankey","given":"T.","email":"","affiliations":[],"preferred":false,"id":471286,"contributorType":{"id":1,"text":"Authors"},"rank":11}]}} ,{"id":70042411,"text":"ds734 - 2012 - Quality of surface water in Missouri, water year 2011","interactions":[],"lastModifiedDate":"2016-08-10T11:14:59","indexId":"ds734","displayToPublicDate":"2013-01-07T00:00:00","publicationYear":"2012","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":310,"text":"Data Series","code":"DS","onlineIssn":"2327-638X","printIssn":"2327-0271","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"734","title":"Quality of surface water in Missouri, water year 2011","docAbstract":"The U.S. Geological Survey, in cooperation with the Missouri Department of Natural Resources, designed and operates a series of monitoring stations on streams throughout Missouri known as the Ambient Water-Quality Monitoring Network. During the 2011 water year (October 1, 2010, through September 30, 2011), data were collected at 75 stations—72 Ambient Water-Quality Monitoring Network stations, 2 U.S. Geological Survey National Stream Quality Accounting Network stations, and 1 spring sampled in cooperation with the U.S. Forest Service. Dissolved oxygen, specific conductance, water temperature, suspended solids, suspended sediment, fecal coliform bacteria, Escherichia coli bacteria, dissolved nitrate plus nitrite, total phosphorus, dissolved and total recoverable lead and zinc, and select pesticide compound summaries are presented for 72 of these stations. The stations primarily have been classified into groups corresponding to the physiography of the State, primary land use, or unique station types. In addition, a summary of hydrologic conditions in the State including peak discharges, monthly mean discharges, and 7-day low flow is presented.
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