Hydrologic Unit Maps ( USA)

Abstract

A set of maps depicting approved boundaries of, and numerical codes for, river-basin units of the US has been developed by the US Geological Survey. These maps and associated codes provide a standardized base for use by water-resources organizations in locating, storing, retrieving, and exchanging hydrologic data, in indexing and inventorying hydrologic data and information, in cataloging water-data acquisition activities, and in a variety of other applications. -from Authors