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Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska: November 1982
John B. Townshend, J.E. Papp, E.A. Sauter, L.Y. Torrence, T.K. Cunningham
1982, Open-File Report 82-300-K
The preliminary geomagnetic data included here is made available to scientific personnel and organizations, as part of a cooperative effort and on a data exchange basis because of the early need by some users. To avoid delay, all of the data is copied from original forms processed at the observatory;...
Use of flumes in metering discharge at gaging stations
F. A. Kilpatrick, V.R. Schneider
1982, Open-File Report 82-871
Flumes for metering discharge are usually of two general types--critical-flow flumes and supercritical-flow flumes. In this report the principles underlying the design of each are discussed, the most commonly used flumes of each of the two types are described, and discharge ratings for each are presented. Considerations in choosing and...
Verification of step-backwater computations on ephemeral streams in northeastern Wyoming
Stanley A. Druse
1982, Water Supply Paper 2199
Step-backwater computations were verified by subsequent discharge measurements at three ephemeral streamflow stations in northeastern Wyoming. The standard step-backwater method for gradually varied, subcritical flow was used in computing the water-surface profiles and stage-discharge ratings. Step-backwater computations were made at selected intervals from I through 1,000 cubic feet per second...
Water-level maps of the alluvial aquifer, northwestern Mississippi, September 1981
Daphne Darden
1982, Open-File Report 82-574
The study area, locally known as "the Delta", covers the Mississippi River Alluvial Plain in northwestern Mississippi. The Delta is a nearly flat southward sloping surface characterized by oxbow lakes, abandoned stram channels, natural levees, backswamp areas, and bayous.The accompanying maps were prepared to show the effects of ground-water withdrawal...
Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska: October 1982
John B. Townshend, J.E. Papp, E.A. Sauter, L.Y. Torrence, T.K. Cunningham
1982, Open-File Report 82-300-J
The preliminary geomagnetic data included here is made available to scientific personnel and organizations, as part of a cooperative effort and on a data exchange basis because of the early need by some users. To avoid delay, all of the data is copied from original forms processed at the observatory;...
Time of travel of selected Arkansas streams
T.E. Lamb
1982, Water-Resources Investigations Report 82-4048
Between 1971 and 1981, time-of-travel and dispersion measurements were made in 15 streams in Arkansas. Most of the streams studied were at or near base flow. Graphs are presented for predicting traveltime of solutes in segments of the streams studied. The relationship of time of passage and peak unit concentration...
A generic guide to the larvae of the Nearctic Tanytarsini, (Chironomidae:diptera)
J.W. Steiner, J.S. Doughman, C.R. Moore
1982, Open-File Report 82-768
Larvae of the tribe Tanytarsini occur in nearly every aquatic habitat in North America where they act as primary consumers in the food chain. This new taxonomic guide overcomes some deficiencies in existing keys to this tribe and the reviewed and updated taxonomy enables identification of the larvae that may...
Aeromagnetic measurements in the Cascade Range and Modoc Plateau of northern California; report on work done from June 1, 1980, to November 30, 1980
Richard Couch, Michael Gemperle
1982, Open-File Report 82-932
Aeromagnetic measurements made along flightlines oriented east- west and spaced at 1.6-km intervals and along lines oriented north- south and spaced at 8-km intervals, over approximately 30,000 square km of northern California, exhibit crossing errors of less than 5 nanoTeslas. The measurements show short-wavelength magnetic anomalies associated with near-surface volcanics over and...
Model modifications for simulation of flow through stratified rocks in eastern Ohio
J. O. Helgesen, A. C. Razem, S. P. Larson
1982, Water-Resources Investigations Report 82-4019
A quasi three-dimensional groundwater flow model is being used as part of a study to determine impacts of coal-strip mining on local hydrologic systems. Modifications to the model were necessary to simulate local hydrologic conditions properly. Perched water tables required that the method of calculating vertical flow rate be changed....
Quality of streams in the Bull Mountains region, south-central Montana
J. R. Knapton
1982, Water-Resources Investigations Report 82-2
In October 1977, water-quality monitoring stations were established on five small streams that drain the Bull Mountains and also on the Musselshell River to document present water-quality conditions in a coal area of south-central Montana. Relatively static water-quality conditions exist throughout the annual flow cycle on the small streams but...
Evaluation of sediment yield and sediment data-collection network in the Piceance basin, northwestern Colorado
J. E. Kircher, Paul Von Guerard
1982, Water-Resources Investigations Report 82-4046
Statistical relationships were developed between suspended-sediment discharge and several regional factors of climate, physiography, and land use in the Piceance basin, northwestern Colorado. The purpose of the study was to evaluate the existing sediment collection network, especially in regard to detecting changes in suspended-sediment discharge due to the development in...