A survey of existing storm overflows in this country showed that over one-third of them were defective, mainly because the overflow settings were too low. Criteria for design of these structures are defined and the performance of different types of overflow are discussed in the light of these criteria. The traditional low side-weir type is shown to be inefficient, both in hydraulic control and in the capacity to retain polluting matter. More recent types are better in both these respects. These include the stilling-pond overflow, for which an example of design calculations is given, the storage overflow chamber and the vortex overflow. The storage overflow chamber is designed to retain the "first foul flush" during a storm, and design principles are given in outline. In the vortex overflow, separation of polluting matter takes place through the centrifugal forces induced by circular flow. The use of siphon spillways, especially the air-regulated type, as an alternative to weirs for the control of stormwater flows is also discussed. (TRRL)

  • Availability:
  • Corporate Authors:

    Applied Science Publishers Limited

    22 Rippleside Commercial Estate, Ripple Road
    Barking, Essex,   England 
  • Authors:
    • Sarginson, E J
  • Publication Date: 1979

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00309816
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jun 26 1980 12:00AM