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Kimley»>Horn <br />Rate Control <br />Page 2 <br />o Approximate basin sizing: 0.74 ac-ft (assumes a 2-foot ponding depth below <br />the outlet for filtration) <br />South drainage <br />o New impervious: 2.10 acres <br />o Water quality volume (based on 1.1 inches): 0.19 ac-ft <br />o Approximate basin sizing: 0.28 ac-ft (assumes a 2-foot ponding depth below <br />the outlet for infiltration) <br />Peak stormwater runoff rates for the proposed site must not exceed existing peak runoff rates for the <br />2-year and 10-year 24-hour Atlas 14 rainfall events. Proposed stormwater runoff rates for the 100- <br />year 24-hour Atlas 14 rainfall event must not exceed 0.1 cfs/acre of the total site runoff, or 3.94 cfs. <br />The total site area is 39.38 acres. The proposed stormwater basins will be designed to meet the rate <br />control requirements. The preliminary basin sizes may need to be expanded to meet rate control <br />requirements as the design advances and site -specific rate control modeling is completed for the <br />existing and proposed conditions. <br />kimley-horn.com <br />