Geology topics
Publications and source records attributed to William Stewart Eisenlohr.
Approximately three per cent of the variation in streamflow of the Kootenai River near Copeland, Idaho, has been found to be associated with variation in water temperature. This has been determined by correlation analysis of residuals in streamflow that were not accounted for by either gage height or slope.
This report presents all the information, obtained during the investigation, that lends itself to generalization. It describes conditions on that part of the Coteau du Missouri where there is little integration of drainage systems. The surface of the glacial drift in this region is dotted with shallow depressions known as prairie potholes that hold water for varying lengths of time. Precipitation directly on a pothole is the basic source of its water supply, but it is only about half the potential evaporation; therefore, potholes tend to go dry. Basin inflow from melting snow or rain occurs only when the soil is frozen or saturated, a condition so erratic in occurrence that seasonal or annual precipitation is of little value as an indication of basin inflow. Net seepage outflow occurs from potholes on the higher parts of the Coteau at very low rates, but it can amount to 20 to 30 percent of the total water loss from a pothole. Net seepage inflow occurs at the potholes on the lower parts of the Coteau. The phreatic surface (water table) tends to be a subdued image of the topography and is generally very near the land surface. The water surfaces of the potholes are part of the phreatic surface, and therefore they can be used to prepare a contour map of the phreatic surface; wells usually act as piezometers and thus are useless for such a purpose. Generally, potholes with water relatively low in dissolved solids have net seepage outflow, and those with water containing high concentration of dissolved solids have net seepage inflow. The direction of ground-water movement can therefore be inferred from the quality of water in potholes. The total salinity of water in a pothole is largely a function of the rate of ground-water flow and the relationship of seepage inflow to outflow. The species of emergent aquatic vegetation that grow in a pothole are directly related to the permanence and salinity of the water at the particular site of each species. The report contains a table of the common species that can be used as indicators of these conditions.
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In making reconnaissances for water supplies on the public domain as part of the Soil and Moisture Conservation Program of the Department of the Interior, the Geological Survey obtains information on the availability of water that is useful for other purposes or in other areas. This report contains the information thus collected during the calendar year 1960 in 46 areas scattered throughout 8 Western States. The accompanying tables list the sites of wells investigated, existing wells, springs, and wells drilled in 1960 as a result of investigations in that or previous years.
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This report is a compilation of the highest known discharges at most gaging stations in the United States and at several places on boundary streams in Canada and Mexico. In the design and operation of a variety of engineering works on rivers, such as dams, spillways, bridges, dikes, and floodways, it is important to know the flood flows for which provision should be made. This report makes available a summary of the records of flood discharges of the streams of the United States for thousands of drainage areas. Many of the records extend back scores of years, and a few extend back more than 100 years. The data concerning maximum known flood flows in this report form a basis of comparison for floods that may occur in the future. The records in the annual surface water reports of the Geological Society provide the broad network on which this compilation is based.