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( <br />c <br />Sunrisc Sen�ices-llrainage Study <br />6. WATER QUALITY SIZING (cont) <br />WATER QUALITY DGSIGN <br />AvnilaGle Open 6i�n(er CeII Vohune rs: <br />�. 7' of 54" Manhol�s @ 15.9 CP/FT <br />29' of 42" ADS N-12 @ 9.63 CP/Ft <br />4' of 30" AD3 connector @ 4.91 CP/I�'t <br />AvailaUle Detention Totnl <br />� <br />d <br />111.3 cf <br />279.0 cf <br />19.64 cf <br />409.9 cf <br />� Ai�nrlaGle Sltnllo�v WnterTrentntent Cel! Vol�une is: <br />The shallow pond has a botrom «�idth of d' and n bottom Icngth of 12'. <br />The operating �lepth of the water quality cell will flu�tuate behveen 1.5 <br />and 2 feet with approximately 1.5 fcct of standing watcr �t all times. The <br />minimum available volum� uf stanc+ing water is 221 cC of volume. <br />1 <br />:� <br />w <br />:� <br />Toml AvnilnGle lt'nterTrentnient Vohune: <br />Total Available Water Quality storagc equals G30.9 cf > 625 cf required <br />by �verett. The pond will require an additional 2' concrete wall above die <br />3:1 side slope oF the veget,ited pond. Since this represents a potential <br />safery hazard ro pedestrians and drivers, a screcning 48" to 60" fence will <br />be required. <br />DESIGNER"S RECOMMENDATfON <br />It is the ��gincer's Professional opinion that the wet vault �nd open <br />pond required on this project by City code should be replaced with a <br />hvo•cartridge Stormtilter by Stornrn�ater Mnnagement, Inc. based <br />upon the unique urban characler and densily� of the site nnd <br />neighborhood. In our opinion, open ponds aze innppropriute on <br />raluable rnmmercinl property surrounded by previous urban <br />development. <br />wesTr:�tn r:ncnnr:r:its, ivc. �� <br />� <br />reaen•:oi-�o�, <br />