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165645 results.

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Page 4337, results 108401 - 108425

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Method for estimating the magnitude and frequency of floods at ungaged sites on unregulated rural streams in Iowa
O. G. Lara
1987, Water-Resources Investigations Report 87-4132
This report provides techniques and procedures for estimating the probable magnitude and frequency of floods at ungaged sites on Iowa streams. Physiographic characteristics were used to define the boundaries of five hydrologic regions. Regional regression equations that relate the size of the drainage area to flood magnitude are defined for...
Documentation of computer program VS2D to solve the equations of fluid flow in variably saturated porous media
E.G. Lappala, R. W. Healy, E.P. Weeks
1987, Water-Resources Investigations Report 83-4099
This report documents FORTRAN computer code for solving problems involving variably saturated single-phase flow in porous media. The flow equation is written with total hydraulic potential as the dependent variable, which allows straightforward treatment of both saturated and unsaturated conditions. The spatial derivatives in the flow equation are approximated by...
Water resources of Walworth County, South Dakota
Jack Kume, Lewis Howells
1987, Water-Resources Investigations Report 85-4015
The water resources of Walworth County, South Dakota are for the most part undeveloped. In 1978, only about 10,000 acre-feet of water was used for irrigation, stock, domestic, and public supplies; most of this water came form Lake Oahe on the Missouri River, and was used for irrigation. The lake...
Geohydrology and water quality of the Inyan Kara, Minnelusa, and Madison aquifers of the northern Black Hills, South Dakota and Wyoming, and Bear Lodge Mountains, Wyoming
D.P. Kyllonen, K. D. Peter
1987, Water-Resources Investigations Report 86-4158
The Inyan Kara, Minnelusa, and Madison aquifers are the principal sources of ground water in the northern Black Hills, South Dakota and Wyoming, and Bear Lodge Mountains, Wyoming. The aquifers are exposed in the Bear Lodge Mountains and the Black Hills and are about 3,000 to 5,000 ft below the...
Flood hazards along the Toutle and Cowlitz rivers, Washington, from a hypothetical failure of Castle Lake blockage
Antonius Laenen, L.L. Orzol
1987, Water-Resources Investigations Report 87-4055
A recent evaluation of groundwater and material in the blockage impounding Castle Lake shows that the blockage is potentially unstable against failure from piping due to heave and internal erosion when groundwater levels are seasonally high. There is also a remote possibility that a 6.8 or greater magnitude earthquake could...
Hydrologic data for urban studies in the Houston metropolitan area, Texas, 1984
Fred Liscum, J.P. Bruchmiller, D. W. Brown, E.M. Paul
1987, Open-File Report 86-608
Hydrologic investigations of urban watersheds in Texas were begun by the U.S. Geological Survey in 1954. Studies are now in progress in the Austin and Houston areas, and have been completed in the Dallas-Fort Worth and San Antonio areas. The U.S. Geological Survey, in cooperation with the city of Houston, began...