Methods of Rating Unsaturated Zone and Watershed Characteristics of Public Water Supplies in North Carolina

Water-Resources Investigations Report 99-4283
Raleigh, North Carolina   2000
By Jo Leslie Eimers, J. Curtis Weaver, Silvia Terziotti, and Robert W. Midgette

Prepared in cooperation with the
Public Water Supply Section of the Division of Environmental Health,
North Carolina Department of Environment and Natural Resources

REPORT

• Abstract
• Introduction
  • Purpose and scope
  • Acknowledgments
• Methods of rating unsaturated zone and watershed characteristics of public water supplies
  • Mechanisms of inflow to public water supplies
  • Method for rating vulnerability of a water supply
  • Factors used to determine an unsaturated zone rating
    • Vertical hydraulic conductance of the unsaturated zone
    • Land-surface slope
    • Land cover
    • Land use
    • Example of an unsaturated zone rating
  • Factors used to determine a watershed characteristics rating
    • Average annual precipitation
    • Land-surface slope
    • Land cover
    • Land use
    • Ground-water contribution
    • Example of a watershed characteristics rating
• Limitations
• Summary
• References
• Appendix - Documentation on Geographic Information System (GIS) data sources

FIGURES

TABLES

CONVERSION FACTORS, TEMPERATURE, VERTICAL DATUM, AND ACRONYMS

REVISION HISTORY

U.S. DEPARTMENT OF THE INTERIOR BRUCE BABBITT, Secretary   U.S. GEOLOGICAL SURVEY Charles G. Groat, Director