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exiting from belaw the pond Normal Water Level (NWL� will retain buoyant material (oil,fuel, <br /> etc.}within the pond. See construction plans for additional detail related to the treatment <br /> area. <br /> 3.2 RATE CONTROL <br /> Rate cantrol wiN be achieved with the dynamic storage and outlet configuratian provided in <br /> the new stormwater management area. To ensure conformance with the required design <br /> rainfall events,the system has been modeled with the HydroCAD modeling software using <br /> the TR-20 methodology and Atlas 14 design rainfall amounts. The following table summarizes <br /> the model results, as detailed in the output included in Appendtx C. <br /> Table 1:Flow Rate Comparfson <br /> Node 15x Node iR <br /> Existiag Q Proposed Q <br /> Ra+nfall Event (cis) (cfs) <br /> 2-Year,2.9"Event 5.1 2.6 <br /> 10-Year,4.3"Event 12.1 7.1 <br /> 100-Year,7.3"Event 3a.0 22.5 <br /> A nominal filtration rate of 1.0" per hour has been applied to the filtration basin bottom area <br /> in the form of a constant flowrate of 0.04 cfs above the NWL elevation. The mode!starting <br /> water surface elevation is the pool elevation of 983.0,with a 100-year bounce to 986.3. A <br /> reinforced EOF shoufd be provided at an elevation of 986.5, with the remainder of the berm <br /> being no less than 987.0. <br /> As indicated,the proposed stormwater management system adequately restricts the runoff <br /> discharge to at or below existing rates for the design storms. <br /> Eisinger Meadow-SWMP Page � 3 <br /> March 2016 <br />