URBAN STORM RUNOFF INLET HYDROGRAPH STUDY. VOLUME 2. LABORATORY STUDIES OF THE RESISTANCE COEFFICIENT FOR SHEET FLOWS OVER NATURAL TURF SURFACES

The main objective of this study is to develop an accurate design method for computing inlet hydrographs of surface runoff, with average recurrence intervals of 10, 25, and 50 years, from typical urban highway by flood routing technique. Resistance to sheet flows over natural turf surfaces is experimentally investigated. The formulation of a functional relationship between the resistance coefficient and controlling parameters for shallow flows over various turf surfaces is essential to the mathematical modeling of surface runoff from urban highway sideslopes covered with different species of turf. An analysis of results obtained from laboratory experiments for laminar flow on Kentucky Blue grass and Bermuda grass reveals that a relationship exists between the Darcy-Weisbach friction coefficient, Reynolds number, and bed slope.

  • Supplemental Notes:
    • See also Volume 1, PB-263 985. Also available in set of 5 reports PC E13, PB-263 984-SET.
  • Corporate Authors:

    Utah State University, Logan

    Utah Water Research Laboratory
    Logan, UT  USA  84321

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  USA  20590
  • Authors:
    • Chen, C L
  • Publication Date: 1976-3

Media Info

  • Pagination: 107 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00151814
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: FHWA-RD-76-117 Final Rpt., PRWG-106-2
  • Contract Numbers: DOT-FH-11-7806
  • Files: NTIS, TRIS, USDOT
  • Created Date: May 11 1978 12:00AM