This project deals with pavement drainage. The central theme is the need for drainage and the field of application, function and design of open and covered drains. The cost of drainage systems is 5-8% of the total construction and maintenance cost. Insufficient drainage can cause damage due to decreased stability and increase of frost damage. Drainage needs are dependent on the subgrade and the ground water level. At present this is not considered in drainage design. Instead the design of ditches and covered drains is based on the frost susceptibility of the subgrade. In Finland, Norway and Sweden the use of open ditches is the normal design. Deep ditches cause high excavation costs, traffic hazards and unaesthetic appearance. In order to reduce the objections against covered drains their rational methods for construction, lifetime and maintenance should be demonstrated. Drainage contributes to sufficient strength and evenness of the road. The relations between strength, drainage depth, thickness and quality of the road structure should be studied so that optimal drainage can be implemented. On a certain part of a road increased drainage measures may be substituted for increased thickness of the road structure if this is economically most feasible. /TRRL/

  • Corporate Authors:

    Nordiska Vaegtekniska Foerbundet, Sweden

    Stockholm,   Sweden 
  • Publication Date: 1977


  • Swedish

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 73 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00182679
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Report No. 12 Monograph
  • Files: ITRD, TRIS
  • Created Date: Dec 3 1978 12:00AM