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Page 5058, results 126426 - 126450

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Sediment yields in eastern Montana; summary of data and proposed techniques for estimating sediment yields from small, ungaged watersheds
J. H. Lambing
1984, Water-Resources Investigations Report 84-4200
Sediment-yield data for 121 sites in eastern Montana have been compiled from results of studies conducted by various Federal, State, and private agencies. Methods used to determine mean annual sediment yields included reservoir sedimentation surveys, suspended-sediment sampling in streams, and estimates of gross erosion and indirect estimation based on physical...
State hydrologic unit maps
P. R. Seaber, F.P. Kapinos, G.L. Knapp
1984, Open-File Report 84-708
A set of maps depicting approved boundaries of, and numerical codes for, river-basin units of the United States has been developed by the U.S. Geological Survey. These ' State Hydrologic Unit Maps ' are four-color maps that present information on drainage, culture, hydrography, and hydrologic boundaries and codes: (1) the...
Discharge ratings at gaging stations
E.J. Kennedy
1984, Techniques of Water-Resources Investigations 03-A10
A discharge rating is the relation of the discharge at a gaging station to stage and sometimes also to other variables. This chapter of 'Techniques of Water-Resources Investigations' describes the procedures commonly used to develop simple ratings where discharge is related only to stage and the most frequently encountered types...
Effects of storm-water runoff on water quality of the Edwards Aquifer near Austin, Texas
Freeman L. Andrews, Terry L. Schertz, Raymond M. Slade Jr., Jack Rawson
1984, Water-Resources Investigations Report 84-4124
Analyses of samples collected from Barton Springs at approximately weekly Intervals and from Barton Creek and five wells in the Austin area during selected storm-runoff periods generally show that recharge during storm runoff resulted in significant temporal and area! variations in the quality of ground water in the recharge zone...
Oregon ground-water quality and its relation to hydrogeologic factors — A statistical approach
T. L. Miller, J. B. Gonthier
1984, Water-Resources Investigations Report 84-4242
An appraisal of Oregon ground-water quality was made using existing data accessible through the U.S. Geological Survey computer system. The data available for about 1,000 sites were separated by aquifer units and hydrologic units. Selected statistical moments were described for 19 constituents including major ions. About 96 percent of all...
Phosphate rock resources of the United States
James Bachelder Cathcart, Richard Porter Sheldon, Robert A. Gulbrandsen
1984, Circular 888
In 1980, the United States produced about 54 million tons of phosphate rock, or about 40 percent of the world's production, of which a substantial amount was exported, both as phosphate rock and as chemical fertilizer. During the last decade, predictions have been made that easily ruinable, low-cost reserves of...
Computation of water-surface profiles in open channels
Jacob Davidian
1984, Techniques of Water-Resources Investigations 03-A15
The standard step-backwater method of computing water-surface profiles is described in this chapter. The hydraulic principles and assumptions are reviewed, and the field data requirements are described. Certain special cases of backwater curves and certain special field conditions are discussed in detail. The technique is used to establish or extend...