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çiyijUP <br /> Rate Control practices proposed: <br /> Rate control for the project is provided by the proposed infiltration basin. The runoff rates <br /> for the 1-YR, 10-YR and 100-YR rainfall events will be less than the existing rates (utilizing <br /> Atlas-14). <br /> See the table below for the existing and proposed runoff rates for this project. <br /> Rate Control Summary Table: <br /> Stormwater Rate Summary <br /> Drainage Area Existing Rate(cfs) <br /> 1-YR 12.471 10-YR[4.24"] 100-YR[7.501 <br /> EX1 1.48 3.86 8.68 <br /> EX2 1.37 3.59 8.06 <br /> TOTAL(REACH) 2.85 7.45 16.74 <br /> Drainage Area Proposed Conditions Rate cfs) <br /> 1-YR[2.471 10-YR[4.241 100-YR[7.501 <br /> 1P (PR1A) 0.19 0.46 0.76 <br /> 2P (PR1 B) 0.12 0.73 1.56 <br /> PR2 2.51 6.11 13.12 <br /> • <br /> TOTAL(REACH) 2.80 7.24 15.32 <br /> Overall Stormwater Rate Summary <br /> Existing Conditions Proposed Conditions <br /> Rate(cfs) Rate(cfs) <br /> 1-Year Event 2.85 2.80 <br /> 10-Year Event _ 7.45 7.24 <br /> - <br /> 100-Year Event 16.74 15.32 <br /> Conclusions: <br /> This project is proposing to utilize two underground rate control basins to meet the <br /> requirements of the City of Orono. The underground basins will be designed to provide rate <br /> control to match existing discharge rates from the site. <br /> www.CivilSiteGroup.com 4931 West 35th Street•Suite 200• St. Louis Park• Minnesota• 55416 (612)615-0060 <br />