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• <br /> All runoff for the new drive aisle system is to a 1-cartridge steel catch basin"storm filter" <br /> located at the north end of the north/south drive aisle area. The"storm filter"will receive <br />• all new drive aisle runoff and treat it prior to entering into the storm chamber detention <br /> system. Refer to the drainage calculation section in this report for sizing of the catch basin <br /> "storm filter". <br />• <br /> All existing roof drains for the site have been designed to directly connect into the new <br /> storm chamber detention system. In order to facilitate on-site stormwater management, <br /> roof drains for units 5-8 have been designed to drain to splash blocks(1 splash block per <br />• <br /> 700 sf. of roof top area). The storm chamber detention system has been designed to <br /> analyze roof top runoff, from units 5-8, as pervious lawn area. <br />• <br />• <br />• <br />• <br />• <br />• <br /> E: /2011 / 111103A/Drainage Report.doc <br />• <br />