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meter Management Report <br /> Page T Sturbridge Village, Phase II <br /> V. Detention Recommendations: <br /> There is no practical way to concentrate and detain an <br /> Drainage Area #1. Drainage Area #3 includes a large any runoff off-site <br /> area as well as overflow from the existing 9 amount The off-eite <br /> amount of runoff passing through ere makes pond. The large <br /> impractical location for a ough the site here makes this an <br /> structure located location the small detention basin. An existing dam <br /> detention basin. Drainage back of Lot #22 can be modified and used as a <br /> denies this basin aitnAre8 #2, created by the proposed road, <br /> entire site. Use of this existing runoff to structure retwilltcauselthe least <br /> the <br /> disturbance to the natural surroundings, (See Appendix) <br /> VI. Detention asin Design: <br /> Basin Drainage Area 14 Ac <br /> Peak Runoff Inflow = Qin m (0.23)(7.5)(14) = 24.2 <br /> Storage Required = 3600 cf @ 4.5' depth <br /> Qout = Qin - sto./tp = 24.2 - 3600/300 = 12.2 cfs <br /> 15" cmD o let: NW/0 a 54"/15" = 3.6, <br /> Qout a 12.2 cfs .. OK <br /> Storage Volume = 3600 cf. Outflow Detention ; 12.0 cfs as <br /> required. <br /> VII. elusion: <br /> This study indicates that a detention basin must be <br /> site to meet stormwater detention requirements. constructed on the <br /> approximately 3600 cf and allow an outflow o12. cfs which iwilltore <br /> maintain peak runoff from the site at <br /> pre-development levels. <br /> Final engineering design of this management <br /> topographic mapping of the r detention plan i. dependent ti field <br /> volume <br /> topographic <br /> will mapping achievable either proposed detention area. The detention <br /> valley at the detention structure orsb storing scary exca in the oaach <br /> the necessary storage volume Y auxiliary excavation to achi eve <br />