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.
- See also Volume 1, PB-263 985. Also available in set of 5 reports PC E13, PB-263 984-SET.
Utah State University, LoganUtah Water Research Laboratory
Logan, UT USA 84321
Washington, DC USA 20590
- Chen, C L
- Publication Date: 1976-3
- Pagination: 107 p.
- TRT Terms: Culvert inlets; Design; Field tests; Flood routing; Flow; Friction; Grasses; Highways; Hydrographs; Laboratory tests; Mathematical models; Reynolds number; Runoff; Simulation; Slopes; Storm sewers; Streamflow; Surfaces; Test procedures; Turf; Urban areas; Water
- Uncontrolled Terms: Inlets; Side slopes
- Geographic Terms: Utah
- Old TRIS Terms: Resistance
- Subject Areas: Design; Highways; Hydraulics and Hydrology;
- 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