The Design of Temporary Sediment Controls with Special Reference to Water Quality

The laboratory and fie[d trapping efficiencies of several tyres of flow barriers were ascertained. The materials used to fabricate the barriers were various types of hay, straw, crushed stone, and crushed stone/straw mixes. Field checks of systems of battlers have indicated that flow barriers placed by the contractor have a near zero average efficiency. Experimentally modified flow barriers designed by the Soil Loss Equation have an average efficiency approaching that found [n the laboratory tests. Sizeable reduction (7%) in the downstream bottom-dwelling organisms was observed with the currently used flow barriers, while for the experimental barriers a smaller reduction was noted. Field observations appear to indicate that for relatively short-term, non-,point sediment sources, such as highway construction, the bedload may have a more important effect on stream ecology than the suspended load, A method for the estimation of' the time required for stream rehabilitation was developed and used in the study. For the area studied, rehabilitation appears to be on the order of two to three months after construction stops and vegetation is established, The rehabilitation time appears to .be dependent upon stream flow and upstream colonization factors,

  • Record URL:
  • Corporate Authors:

    Virginia Highway and Transportation Research Council

    Charlottesville, VA  United States 
  • Authors:
    • Poche, David J
  • Publication Date: 1975-8

Language

  • English

Media Info

  • Media Type: Web
  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 54p

Subject/Index Terms

Filing Info

  • Accession Number: 01344841
  • Record Type: Publication
  • Report/Paper Numbers: VHTRC 76-R4
  • Files: NTL, TRIS, STATEDOT
  • Created Date: Jul 6 2011 2:14PM