From purpose and scope: In 1980, collection of suspended-sediment records was terminated at station 09379500. The purpose of this report is to evaluate the records that were collected and to describe suspended-sediment characteristics in the San Juan River near Bluff based on those records.

Purpose and scope: This report describes the relationship between geology and ground-water occurrence in Oswego County and indicates how much ground water is likely to be available in any given area. It is a companion to a series of 29 maps produced during 1978-80^1 to document the surficial deposits in the county's 29 quadrangles and includes a compilation of data on representative wells in each quadrangle.

From introduction: This report outlines procedures to relate suspended-chemical concentrations (nutrients, metals, or organic constituents) associated with suspended sediments in storm-water runoff to suspended-sediment particle-size classes based on settling velocities.

From introduction: In 1978 the U.S. Geological Survey began a 4-year study of aquifers in the northern Great Plains. The purpose of this map, which is a product of that study, is to show the total thickness of the "Dakota sandstone" (drillers' term).

From purpose and scope: The purposes of this investigation were to: (1) establish a data base for water-quality and fluvial-sediment characteristics of selected streams that will serve as a basis for documenting current (1982) conditions, (2) develop relationships between streamflow or specific conductance and water-quality characteristics that can be used to describe water-quality characteristics and determine discharges of dissolved solids, and (3) develop relationships between streamflow and suspended sediment that can be used to determine suspended sediment discharges of streams in the study area.

From introduction: The purpose of this report is to: (1) Present flood data for the gaged sites used in the flood-frequency analysis. (2) Describe the method of analysis used to develop the flood-estimating technique. (3) Provide regression equations for estimating floods on natural-flow (unregulated) streams. (4) Provide a method for improving the flood estimate at gaged sites. (5) Provide illustrative examples of applying the flood-estimating technique.

From abstract: This report summarizes the uses of water in Wisconsin for 1979, except aesthetics, navigation, and recreational use.

Introduction: In 1978, the U.S. Geological Survey began a 4-year study of aquifers in the northern Great Plains. The purpose of this map, which is a product of that study, is to show the cumulative thickness of sandstone in the Fox Hills-lower Hell Creek aquifer. Other maps show the altitude of the top (Feltis, 1982a), total thickness (Feltis, 1982b), and potentiometric surface of water (Levings, 1982) of the Fox Hills-lower Hell Creek aquifer. These maps are part of a series that describes the geology and potentiometric surface of selected rock units of Jurassic or younger age in the plains area of Montana.

From introduction: The purpose of the overall study is to determine impacts of strip mining on local hydrologic systems.

This is a map, scale 1:250,000, showing the difference between the potentiometric surfaces of the Magothy aquifer of September 1975 and September 1982 in southern Maryland.

Abstract: A computer model was developed to calculate the drawdown, due to a proposed well, at all existing wells in the section of the proposed well and at all wells in the adjacent eight sections. The depletion expected in the 9-square-mile area due to all existing wells and the proposed well is computed and compared with allowable limits defined by the Southwest Kansas Groundwater Management District No. 3. An optional program permits the evaluation of allowable depletion for one or more townships. All options are designed to run interactively, thus allowing for immediate evaluation of proposed ground-water withdrawals.

Information is presented for estimating the magnitude and frequency of floods on streams in South Carolina. Flood-frequency characteristics for 151 gaging stations were related to basin characteristics by multiple regression techniques for each of four physiographic provinces. Equations were derived to estimate flood magnitudes at recurrence intervals ranging from 2 to 100 years on streams with drainage areas greater than 1.0 square mile. Examples demonstrate the procedure for computing flood-frequency discharge for sites on gaged and ungaged streams in South Carolina. Relationships of flood discharge and frequency to drainage area are presented for the main stem of major streams. A compilation of flood records for gaging stations in South Carolina is presented as supplemental data.

From purpose and approach of study: The purpose of this study was to develop a predictive model of the ground-water system for use as a management tool. The model will be used by State and local officials in evaluating the effects of alternative methods of controlling or developing the ground-water resources of the Big Sioux aquifer in Minnehaha County.

From introduction: In 1978 the U.S. Geological Survey began a 4-year study of aquifers in the northern Great Plains. The purpose of this map, which is a product of that study, is to show the total thickness of the combined Eagle Sandstone and Telegraph Creek Formation.

From abstract: "In the Yampa River basin, Colorado-Wyoming, 35 major reservoirs and 2 transmountain diversion have been proposed to provide additional water for increasing uses. A multireservoir-flow computer model was used to simulate effects on streamflow of five potential options--one representing historical conditions and four representing various degrees of reservoir and transmountain-diversion development." It contains maps and tables.

From introduction: In 1978 the U.S. Geological Survey began a 4-year study of aquifers in the northern Great Plains. The purpose of this map, which is a product of that study, is to show the cumulative thickness of sandstone in the "Dakota sandstone" (drillers' term).

From purpose and scope: This report describes a method of estimating downstream responses of reservoir releases from the Bloomington and Savage Reservoirs in the upper Potomac River basin.

Introduction: The alluvial deposits form the principal aquifer in the Owl Creek Valley and the source of water to many stock and domestic wells and to a few irrigation wells. In 1975, the U.S. Geological Survey, in cooperation with the Wyoming State Engineer, began an investigation of the hydrology and geology, including the geomorphology, of Owl Creek Valley (fig. 1) to determine possible favorable areas for obtaining ground water of adequate chemical quality for irrigation and other uses. The part of Owl Creek basin investigated is downstream from Anchor Reservoir and includes North Fork, South Fork, and the mainstem of Owl Creek (pi. 1). However, the area downstream from Embar Ranch (pi. 1) was emphasized during the study.

Purpose: The purpose of the study was to (1) determine quantity and quality of urban runoff from the upper Grange Hall Creek drainage basin in Northglenn; (2) identify constituents exceeding water-quality standards for agricultural waters; (3) compare differences in quality between dry-weather flow, snowmelt runoff and rainfall runoff; (4) determine rainfall-runoff relationships; (5) investigate relationships between constituent concentrations, specific conductance, and streamflow; and (6) suggest, where appropriate, alternatives of urban-runoff management.

From abstract: A two-dimensional digital model of the ground-water-flow system was constructed to test the conceptual model of the system ad to study the effects of development on ground-water levels and flow in the White River.

From introduction: The objectives of this study were: (1) to determine the direction of ground-water flow and seasonal fluctuations of the water table; and (2) to assess the water quality in developed and undeveloped areas.

Introduction: In 1978 the U.S. Geological Survey began a 4-year study of aquifers in the northern Great Plains. The purpose of this map, which is a product of that study, is to show the cumulative thickness of sandstone in the Lakota Formation and equivalent rocks. Other maps show the altitude of the top (Feltis, 1982a), total thickness (Feltis, 1982b), and potentiometric surface of water (Levings, 1982) of the Lakota Formation and equivalent rocks. These maps are part of a series that describes the geology and potentiomentric surface of a selected rock units of Jurassic or younger age in plains area of Montana.