I am sizing a detention pond with a 260 ac watershed. I am using the SCS method and coming up with 22 ac-ft of storage. The actual developed property within the watershed is 60 acres. This seems to be a high required volume. When I say high volume the only thing I have to compare it to is the rational method with a smaller watershed. The time of concentrations and CN values are relatively close for the pre and post. Is their another method that I can use for a comparison other than the rational? I do not trust the rational.......
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