Sheet flow calculations for Tc
Sheet flow calculations for Tc
(OP)
I am looking to update my reference for calculating sheet flow lengths for Tc. Any recommendations?
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Sheet flow calculations for Tc
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RE: Sheet flow calculations for Tc
http://tinyurl.com/y58yy8
RE: Sheet flow calculations for Tc
RE: Sheet flow calculations for Tc
Ch 3 of TR55 may be of help.
Take a look at a drainage manual from your state's DOT.
VDOT has theirs online - perhaps your state or locality does too.
RE: Sheet flow calculations for Tc
The prevailing guideline is that sheet flow depth must not exceed 1/10 foot. (At that point it becomes shallow concentrated flow or channel flow.) However, this still tends to require on-site inspection. From the NRCS paper:
"With all the variability across the country with respect to soil, land use, climate, geomorphology, etc, there is no substitute for investigating sheet flow characteristics of the watershed in the field."
You can also find this document under "H&H Papers" at htt
RE: Sheet flow calculations for Tc
RE: Sheet flow calculations for Tc
These procedures are discussed in NEH-4 Chapter 15, pages 6-9 available at www.
RE: Sheet flow calculations for Tc
Otherwise, follow NRCS tech note 4 and expect sheet flow to be much less than 100 ft - also, the Note states that it is assuming a certain minimum amount of rainfall to occur in order for sheet flow to occur. You may not have any surface flow accoring to their Note for storms less than 2yr storm depth. Check it out carefully.