| PLEASE USE THE USGS WEBSITE |
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| The Hydrologic Investigations Atlases (HA) Series contain either black-and-white or multicolor maps showing a wide range of water-resources information, such as depth to ground water, floods, irrigated acreage, producing aquifers, water availability, surface-water discharge, chemical or mineral content of water, surface impoundments, and water temperature.More than 700 hydrologic atlases have been published; most HA maps were prepared in cooperation with State, county, and municipal agencies. Maps vary in sheet size, number of sheets and scale. |  Part of "Hydrologic Unit Map-1981, State of Nevada," 1:500,000, Lambert conformal conic projection, 45 x 65-1/2 inches. |
| Principal maps are most frequently presented at a scale of 1:24,000; however, much smaller scales are used for larger areas of study. Flood-prone areas are outlined on standard USGS 1:24,000-scale topographic quadrangle maps as part of the Federal program for managing flood losses in urban areas. Flood-prone area maps, although not a published series, are available, by quadrangle name, from the Water Resources Division District Office in the State of interest. Locations of these offices can be obtained by contacting the Office of Water Information, Water Resources Division, U.S. Geological Survey, 423 National Center, Reston, VA 22092. | |
| Hydro Ground water.
A special multisheet hydrologic atlas series, "Ground Water Atlas of the United
States," is being published. This series includes maps and descriptions of the
principal aquifers of the Nation. Multicolor maps at scales ranging from 1:2,500,000 to
1:100,000 show the location, extent, thickness, potentiometric surface, and variations in
water quality for the aquifers. Nationwide summary maps are at a scale of 1:7,500,000. Supplementary illustrations and simplified text describe the most important aspects of the geology and hydrology of each aquifer. |
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