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Rational runoff coefficient

Rational runoff coefficient

Rational runoff coefficient

(OP)
What runoff coefficient is appropriate for a gravel driveway?  I was going to use 0.5.  I am using 0.9 for the concrete portion of the driveway.
Thank you,
Brett

RE: Rational runoff coefficient

I am using 0.7 on a current project.  That is the upper end of the range which according to a paper published by ADS is from 0.35 to 0.70.  I like to worst case it.

Hope this helps
DPA

RE: Rational runoff coefficient

It really depends on the depth of the gravel d/w and the underlying soils.

RE: Rational runoff coefficient

(OP)
Thank you!  I could not find any published ranges for gravel.  We did not perc test this lot so I too will use 0.7.

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