A DIRECT APPROACH TO STORM DESIGN - AND A CHALLENGE TO THE TRRL METHOD

In this article, the author challenges the TRRL method of storm sewer design on the following three main points:- (A) contrary to assumptions made in the TRRL research, rainfall does not start contributing to flow in sewers for several minutes. In most instances, flow at the measuring point does not start increasing rapidly until the middle of the storm. (b) the author contends that the TRRL method of obtaining better correlation between experiment and calculation by adjusting individual rainfall intensities in each storm by the percentage run off, is unworkable in a design method. (c) the author's 'direct method' is briefly outlined, and data from 47 storms are presented, showing the correlation between calculated and measured flows, given by this method. The author claims that the 'direct method' is simpler to understand and use, and gives a closer fit with recorded flows. (see also irrd abstract no. 212671). /TRRL/

Media Info

  • Features: Photos; Tables;
  • Pagination: p. 44-46
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00125075
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Oct 18 1975 12:00AM