Detention Basin Volume

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jeb6294

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Not sure if my brain hasn't started working or what (I just got back from vacation)....

How can I determine what size detention basin I need with a calculated Qin and a specified Qout using the rational method. I can do it using TR55, but all my other calcs are based on rational so I'd rather not switch back and forth.

i.e. I have detention basin with ~25 cfs coming into it and I want to limit the discharge to, let's say 10 cfs irregardless of what the governing body's requirements are (the basin is going to be on a ridge so really there is no predeveloped runoff).

 
You'll need an infinitely big basin, cause 25 in and 10 out don't add up.

The 25 in must be varied at some point, and a medium derived from that variation. correct?

 
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