The Stanford Watershed Model was used to simulate the effects of suburban development on the runoff from five drainage basins in the south-coastal area of California, a region with a semiarid climate and an average annual precipitation of 15 inches (381 millimetres). The drainage basins ranged in size from 3.72 to 83.4 square miles (9.64 to 216 square kilometres). Using the model, synthetic records of runoff for each basin were generated to represent various degrees of suburban development. Examination of the synthetic records indicated that suburban development has the following effects on runoff: 1. Average annual runoff from a drainage basin with an effective impervious area of 10 percent of the drainage area is approximately 2 inches (51 millimetres). The average annual runoff from a fully developed basin with an effective impervious area of 30 percent is approximately 4 inches (102 millmetres). 2. Suburban development can increase the magnitude of peak discharge with a recurrence interval of 2 years by a factor of three to six. 3. Peak discharges that have recurrence intervals greater than a limiting value ranging from 50 to 200 years or more are little affected by suburban development.

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 209-217

Subject/Index Terms

Filing Info

  • Accession Number: 00135900
  • Record Type: Publication
  • Report/Paper Numbers: UKY BU109
  • Files: TRIS
  • Created Date: Oct 26 1976 12:00AM