Gully pots are a very important component of surface water drainage systems. Their main purpose is to minimise the amount of sediment entering systems and possibly causing blockages. Associated with this however, they have two further effects due to their design, which has not changed significantly since inception. Gully pots have a limiting flow rate and also retain a certain quantity of water between storm events, the quality of which deteriorates with time. As a result of this, they are believed to be associated with the "first foul flush" phenomenon in which pollutant levels in sewers rise rapidly at the beginning of storms. This study investigates the present performance criteria for gully pots and endeavours to identify improvements in performance within significant constraints set by cost, construction and maintenance issues. Various simple modifications to existing designs were tested to try to improve sediment retention ability (trapping efficiency) and two new designs investigated. The hydraulic efficiency (flow capacity) of all designs tested was determined. Scope for further research has been identified. (A)

  • Corporate Authors:

    HR Wallingford Limited

    Howbery Park
    Wallingford, Oxon  United Kingdom  OX10 8BA
  • Authors:
    • FORTY, E J
  • Publication Date: 1998-10


  • English

Media Info

  • Features: References;
  • Pagination: 18p+a p.
  • Serial:
    • SR 508
    • Publisher: HR Wallingford Limited

Subject/Index Terms

Filing Info

  • Accession Number: 00790320
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Apr 11 2000 12:00AM