WATER YIELD MODEL USING SCS CURVE NUMBERS

A model was developed to predict daily runoff from agricultural watersheds with areas up to 1.590 km square The model is based on the SCS runoff curve number procedure and a soil moisture index. It was designed to have general applicability, computational efficiency, simple inputs, and good prediction accuracy. The model has one parameter, uses a 1-day time interval, and only outputs runoff volume. Inputs are an estimate of the 11-condition SCS runoff curve number, measured montlhy runoff, daily rainfall, and average monthly lake evaporation. The model is calibrated on a gaged watershed and can be used to extend short periods of record for the calibrated watershed or to predict water yield for nearby ungaged watersheds. In tests with data from 47 watersheds in Texas, the model simulated runoff fairly accurately. Applications include reservoir design, water quality modeling, and flood-control evaluation.

• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Williams, J R
  • LaSeur, W V
• Publication Date: 1976-9

Media Info

• Features: Appendices; References; Tables;
• Pagination: p. 1241-53
• Serial:
  • Journal of the Hydraulics Division
  • Volume: 102
  • Issue Number: HY9
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Flood protection; Mathematical models; Reservoirs; Runoff; Soil water; Water; Water quality; Watersheds
• Uncontrolled Terms: Models
• Old TRIS Terms: Water yield
• Subject Areas: Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00141802
• Record Type: Publication
• Report/Paper Numbers: ASCE #12379
• Files: TRIS
• Created Date: Jan 16 1977 12:00AM