sheet vs shallow flows
sheet vs shallow flows
(OP)
How do you determine the lengths for sheet and shallow flows in a watershed? Is there a standard rule of thumb or depends on watershed characterstics?
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RE: sheet vs shallow flows
Generally, the max length for sheet flow is considered to be 200' (sometimes up to 300') , but you may find that the reviewing agency will only accept 150' or 100' as the maximum. Then the flow becomes a shallow concentrated flow, and you should be able to determine that length using the contours on your topo map or base map.
RE: sheet vs shallow flows
The NRCS has a technical note on this topic at
http
You may get a better response to your question by posting in the Flood/Storm Engineering forum.
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: sheet vs shallow flows