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Page 4439, results 110951 - 110975

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Effects of impoundments on water quality of streams in the Coteau des Prairies: Upper Minnesota River basin
C.J. Smith, G. A. Payne, L. H. Tornes
1990, Water-Resources Investigations Report 90-4033
Water-quality and streamflow data were collected in the Coteau des Prairies region of southwestern Minnesota and eastern South Dakota to document the water-quality characteristics of streams and impoundments in the Coteau, and to predict the effect of proposed impoundments on the quality of water in Coteau streams. Reconnaissance data collection at...
A Mass-balance nitrate model for predicting the effects of land use on ground-water quality in municipal wellhead-protection areas
M. H. Frimpter, J.J. Donohue, M.V. Rapacz, H.G. Beye
1990, Open-File Report 88-493
A mass-balance accounting model can be used to guide the management of septic systems and fertilizers to control the degradation of groundwater quality in zones of an aquifer that contributes water to public supply wells. The nitrate nitrogen concentration of the mixture in the well can be predicted for steady-state...
Relation between urbanization and water quality of streams in the Austin area, Texas
J.E. Veenhuis, R.M. Slade
1990, Water-Resources Investigations Report 90-4107
Selected water-quality properties and constituents of stormflow and base flow were compared to determine the relation between the degree of urbanization and the water quality in a drainage basin. Samples were collected during three flow categories (rising stage and falling stage of stormflow and base flow) at 18 sites on...
Computerized stratified random site-selection approaches for design of a ground-water-quality sampling network
J. C. Scott
1990, Water-Resources Investigations Report 90-4101
Computer software was written to randomly select sites for a ground-water-quality sampling network. The software uses digital cartographic techniques and subroutines from a proprietary geographic information system. The report presents the approaches, computer software, and sample applications. It is often desirable to collect ground-water-quality samples from various areas in a study...
Geohydrology and ground-water quality at the Pueblo Depot activity landfill near Pueblo, Colorado
Kenneth R. Watts, Roderick F. Ortiz
1990, Water-Resources Investigations Report 89-4143
Groundwater samples were collected from the shallow unconfined aquifer at the Pueblo Depot Activity (Colorado) landfill and downstream from the landfill. The Pueblo Depot Activity is a U.S. Department of the Army facility in southeastern Colorado about 15 miles east of Pueblo, Colorado. The land-fill is underlain by upland alluvial...
PRECONDITIONED CONJUGATE-GRADIENT 2 (PCG2), a computer program for solving ground-water flow equations
Mary C. Hill
1990, Water-Resources Investigations Report 90-4048
This report documents PCG2 : a numerical code to be used with the U.S. Geological Survey modular three-dimensional, finite-difference, ground-water flow model . PCG2 uses the preconditioned conjugate-gradient method to solve the equations produced by the model for hydraulic head. Linear or nonlinear flow conditions may be simulated. PCG2 includes...
Continuous seismic reflection profiling of hydrogeologic features beneath New River, Camp Lejeune, North Carolina
A.P. Cardinell, D.A. Harned, S. A. Berg
1990, Water-Resources Investigations Report 89-4195
A medium-power, wide-frequency seismic system was used to collect more than 100 miles of continuous seismic reflection profiling data over a 4- day period along a 24-mile segment of the New River estuary and Intracoastal Waterway. The seismic reflection data were evaluated to determine the continuity of aquifer sediments and...
Simulation of ground-water flow in the Prairie du Chien-Jordan and overlying aquifers near the Mississippi River, Fridley, Minnesota
R. J. Lindgren
1990, Water-Resources Investigations Report 90-4165
A three-dimensional, ground-water-flow model was developed to gain an improved understanding of the ground-water-flow system and its response to withdrawals near the Minneapolis Water Works in Fridley, Minnesota. Eight hydrogeologic units are represented in the ground-water-flow model. Aquifers represented are the unconfined-drift, confined-drift, St. Peter, and Prairie du Chien-Jordan. Confining...