Laserfiche WebLink
�' <br /> PUBL/C W0/4/ffS <br /> �n <br /> MEMORANDUM <br /> TO: Kirk Brooks <br /> FROM: Jane Zimmerman <br /> DATE: 3une 5, 1995 <br /> SUBJECT; Drainage Calculation Review, Bridge Creek Townhomes, <br /> SEPA /i18-95 <br /> r}�o�ra/De�t�n: <br /> The stage-storage reiationship of the pond is required to show that the pond has the <br /> capacity to store the requiced wetpond permanent storage volume and any live detention <br /> volume. <br /> The standards require a minimum of 50% of the wetpond design volume to be provided <br /> as permanent dead st ear�, 24 hourts orm)t1CRo tinSno the�des gn storm developed for <br /> the design storm (2 y <br /> hydrograph through the pond is required to verify that the wetpond design volume is <br /> reached for the des�gn storm. The size of the primary orifice can be decreased as <br /> necessary, to a minimum allowable orifice size of 1 inch, to back up enough live <br /> percentage of the wetpond design volume provided as dead torage mu t be increased <br /> until the combination of dead storage and peak live storage equals the wetpond design <br /> volume. <br /> The control structure must ensure that detention release rates do not exceed allowable <br /> release rates � that the detained volume in the ponQ reaches or exceeds the wetpond <br /> hatghe controlf s�tructure is mee�ing boOth these requir ments.st be submitted showmg <br />