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Development of a 14-digit Hydrologic Unit Code Numbering System for South Carolina

Water-Resources Investigations Report 99-4015

Prepared in cooperation with the South Carolina Department of Health and Environmental Control and the U.S. Department of Agriculture, Natural Resources Conservation Service
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Abstract

A Hydrologic Unit Map showing the cataloging units, watersheds, and subwatersheds of South Carolina has been developed by the U.S. Geological Survey in cooperation with the South Carolina Department of Health and Environmental Control, funded through a U.S. Environmental Protection Agency 319 Grant, and the U.S. Department of Agriculture, Natural Resources Conservation Service. These delineations represent 8-, 11-, and 14-digit Hydrologic Unit Codes, respectively. This map presents information on drainage, hydrography, and hydrologic boundaries of the water-resources regions, subregions, accounting units, cataloging units, watersheds, and subwatersheds. The source maps for the basin delineations are 1:24,000-scale 7.5-minute series topographic maps and the base maps shown on figure 1 are from 1:100,000-scale Digital Line Graphs; however, the data are published at a scale of 1:500,000. In addition, an electronic version of the data is provided on a compact disc. Of the 1,022 subwatersheds delineated for this project, 1,004 range in size from 3,000 to 40,000 acres (4.69 to 62.5 square miles). Seventeen subwatersheds are smaller than 3,000 acres and one subwatershed, located on St. Helena Island, is larger than 40,000 acres. This map and its associated codes provide a standardized base for use by water-resource managers and planners in locating, storing, retrieving, and exchanging hydrologic data. In addition, the map can be used for cataloging water-data acquisition activities, geographically organizing hydrologic data, and planning and describing water-use and related land-use activities.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Development of a 14-digit Hydrologic Unit Code Numbering System for South Carolina
Series title:
Water-Resources Investigations Report
Series number:
99-4015
Edition:
Version 1.0
Year Published:
1999
Language:
ENGLISH
Publisher:
U.S. Geological Survey
Contributing office(s):
South Carolina Water Science Center
Description:
Available online and on CD-ROM
Projection:
Universal Transverse Mercator
Scale:
500000
Online Only (Y/N):
N
Additional Online Files(Y/N):
Y