I've been asked to review a plan that involves the construcution of 3 apartment buildings and related parking in Connecticut. The total impervious area is approximately 5.5 acres and the 25-yr flow was calculated to be about 33 cfs. I don't have any issues with the flow calculation, however a stilling basin is proposed and has been sized in a way with which I'm not too familiar. The method seems reasonable, albeit crude. The designer used the time of concentration and went to the state rainfall intensity chart and obtained a corresponding intensity. With the intensity he/she went into the rainfall frequency-duration-intensity chart and determined a storm duration. Finally, the duration was converted to seconds and then multiplied with the flow (cfs) to obtain a volume. This volume was then used to size the basin. Seems fairly reasonable to me, but have not encountered this design approach before - usually have hydrograph and the computer figure the area under the curve, etc..
Any input as to the validity of the described method and potential limitations would be appreciated. Thanks.
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