Codes for the Identification of Hydrologic Units in the United States and the Caribbean Outlying Areas. Category: Data Standards and Guidelines. Subcategory: Representations and Codes; Earth Science Series

摘要

This standard adopts the set of codes used to identify hydrologic units published in Geological Survey Circular 878-A. These codes identify a hydrologic system that divides the United States and Caribbean outlying areas into 21 major regions. These regions are further subdivided into approximately 2150 units that delineate river basins having drainage areas usually greater than 700 square miles. The codes provide a standardized base for use by water-resources organizations. FIPS 103 was developed by the U.S. Geological Survey, U.S. Department of the Interior, for use in automated earth-science systems, and was adopted as a result of a Memorandum of Understanding signed in February 1980 between the National Bureau of Standards and the Geological Survey.