ESTIMATION OF DIRECT RUNOFF FROM URBAN WATERSHEDS

In the present paper, a quasilinear model of the rainfall-runoff transfer is developed by means of a regional dimensionless kernel function. The instantaneous unit hydrograph (IUH) for a specific storm on a specific watershed is obtained by rescaling the regional dimensionless kernel by using the peak discharge of the IUH, the time lag of the watershed and storm characteristics. The peak discharge of the IUH and the time lag of the watershed are obtained by the given regression relationships. The model is tested by predicting the direct runoff from an urban watershed, the data from which were not used for the calibration of the model. A nonlinear deterministic model involving two kernel functions is used to compute the direct runoff from the rainfall excess. The first and second-order kernels vary with the number of storms used. The regeneration performance of the nonlinear model was not as good as that of the quasilinear model. The runoff hydrographs are sensitive to errors in the second order kernel function. /Author/

• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Hossain, A
  • Rao, A R
  • Delleur, J W
• Publication Date: 1978-2

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 169-188
• Serial:
  • Journal of the Hydraulics Division
  • Volume: 104
  • Issue Number: HY2
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Calibration; Mathematical models; Peak discharge; Runoff; Unit hydrographs; Urban areas; Watersheds
• Uncontrolled Terms: Models
• Old TRIS Terms: Stirrers
• Subject Areas: Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00174400
• Record Type: Publication
• Report/Paper Numbers: ASCE 13565 Proceeding
• Files: TRIS
• Created Date: Jun 14 1978 12:00AM