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Research Report 156 Flushing processes in chipseals: effects of water

Published: | Category: Research & reports , Research programme , Performance monitoring , Activity management , Natural hazard risk management , Safety, security and public health , Environmental impacts of land transport , Transport demand management , Integrated land use and transport systems , Sustainable land transport , About the research programme , Economic development | Audience: General

A study was made of proposed means by which water can enter chipseals surfaces and induce flushing. The means were water transfer from the basecourse and pressure from tyres on wet roads. The data support the occurrence of both phenomena. It is possible that a significantly greater proportion of chipseal surfaces than is commonly believed are in fact permeable to water. Further research is suggested to gain additional information on the flushing process, to assess the prevalence of permeable seals, to devise means of assessing seal sites for their susceptibility to water induced flushing, and to develop ways of countering this phenomenon.

Publication details

  • Author:
  • Published: 1999
  • Reference: 156

A PDF scan of this NZ Transport Agency research report is available from