RAIN WATER DRAINAGE BY MEANS OF STORAGE AND PERCOLATION

REGNVATTENAVLEDNING GENOM MAGASINERING OCH PERKOLATION

Combined sewerage systems are being converted into separate systems due to pollution problems. However, rainwater also contains large quantities of pollutants and must be treated. This project studied percolation and storage of rainwater from roofs, which is cleanest. Storage installations consist of porous fill, from where water slowly percolates down to the water table. Properly designed, these installations perform well even where the subsoil is relatively impervious. Geotechnical surveys for building purposes normally suffice for preliminary design, but percolation capacity and water table must be separately determined. Even where there is no percolation, such installations can be used as detention storage. Savings are possible in pipe sizes; at a gradient of 1:1000, diameter can be cut from 800 mm to 500 mm. Percolation and detention storage can also be an alternative to changing from combined to separate systems. Calculations show that rainwater flow can be halved, reducing number of storm overflows. It is recommended that use be made of cavities in the ground and in pipe trenches for percolation storage; detention storage should be created by single-graded fill areas under ground; parking areas with pervious surfacings and football grounds should be built on beds of crushed rock and gravel. /TRRL/

  • Corporate Authors:

    National Swedish Council for Building Research

    Linnegatan 81
    114 60 Stockholm,   Sweden 
  • Authors:
    • Paus, K
    • Andersson, R
    • Carlstedt, B
  • Publication Date: 1974

Language

  • Swedish

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 111 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00129588
  • Record Type: Publication
  • Source Agency: Swedish National Road and Traffic Research Institute
  • Report/Paper Numbers: No. R23:1974 R&D Rept.
  • Files: ITRD, TRIS
  • Created Date: Apr 7 1976 12:00AM