Extent of Program National Available Product Coverage Map coverage varies according to the kind of information presented. Maps vary as to the number of sheets required to depict the hydrology presented in sheet sizes, and in scale. More than 600 hydrologic atlases have been published. Most of these have been prepared in cooperation with State, county, and municipal agencies.
Atlases usually cover natural hydrologic units, such as drainage basins.
Relevant data, information, and analyses that support the principal atlas maps are often shown on smaller maps, graphs, and tables. Other supporting information is often included, notably photographs and references. Product Delivery Format Maps are available in paper media, folded and placed in an open-top paper jacket. Technical, Ordering, and Availability Information Earth Science Information Centers U.S. Geological Survey, Information Services Other Related Products Digital maps pertaining to water resources are available on line.