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STOItAfNAT[3 SITB PLAN <br />AUGUS"I'A R'OODS COIVDOMINIUMS <br />�9AY 20, 2003 <br />PAGL 22 <br />BAS[\` Z <br />Thc storni drainagc systcm uscd lor 13asin 2 consists of collcction and cortvcyance uf <br />mnoif to a���et vaul[ for sedimcnt removal. Thc release from flie wet vault then flows to <br />the "live" storage portion of the detentiun vault where it is detained. The release tion� thc <br />detention vault then flows though a wet pond prior to discharge via a icvcl spreader to the <br />wetland. Tlie trcatrnent facily for Basin 2 has bcen up-sized to providc for the traatmcnt <br />requirements for Basins 3, 4& 5. The total treatment volume is dtc combined volume ol' <br />die 6 month storm events for Basins 2, 3, 4 R 5: <br />Basin 2 4,404 cf <br />Basin 3 723 cf <br />Basia d 614 cf <br />Basin 5 Sd cf <br />Total Volume �,52� cf� <br />CiNfP RD.IS WET VAULT/T�WK <br />The minimum volumc of thc seuiment;uion vault has becn calculatcd using thc <br />rcquircmcnts of thc CEM Manual with thc following cyuations: <br />Q,� = 6 month volume/36,d00 <br />= 5,325/36,�100 = 0.067� <br />V,,,,,, = 1676.� Q�, H usc FI = G' <br />= 1676.�(0.0G74)(G) <br />= 673 cf <br />'fhc minimum volunte can also not bc Icss th�n thc ��ulumc of runoff Gom tl�c 6 month <br />stomi event minus the "dead" storagc volume in the wet pond, sce below. <br />V,,,;� = S,S25 — 330 = 4,945 cf <br />Thc proposed dctcntion vault includes a"dc:�d" storagc ccll with the following <br />dimensions: <br />Lcngth = 5� fcct <br />�Vidtlt = 15 feet <br />Depth = 6 feet <br />.,Dcad" Storagc Volumo = 4,9�0 c( <br />[3MPRD.05 WL-T POND <br />The volume of the �vct pond has been calculated using the requirements of the CE1�1 <br />ManuaL The minimum volumc can also not be le� dian l� percent of the required deacl <br />storage, the volume of runoff from the 6 month storm event. <br />V����„ = 0.1 � (S,S25) = S74 cf <br />The "d�ad" stor�gc volume provided in the proposed open ccll pond is S30 ct: <br />� <br />� �r.+�����c,,o,�s', ��;���� �a���s s.«,����,3a�roo<<:m�ms�ssro�a;� oocDWH/srm <br />