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Civil Site Group - Stormwater Calculations <br />Area [SF] CN Value Area [SF] CN Value Area [SF] CN Value <br />EX1 (DRAINS TO STINSON STORM SEWER)66759 98 8198 80 74957 96 <br />EX2 (DRAINS OFFSITE OVERLAND)700 98 6455 80 7155 82 <br />Area [SF] CN Value Area [SF] CN Value Area [SF] CN Value <br />PR1 (TO 1P) 51989 98 7539 80 59528 96 <br />PR2 (DRAINS OFFSITE) 2107 98 20477 80 22584 82 <br />Impervious [SF] Impervious [AC] Pervious [SF] Pervious [AC] Total [SF] Total [AC] <br />Existing Site 67459 1.55 14653 0.34 82112 1.89 <br />Proposed Site 54096 1.24 28016 0.64 82112 1.89 <br />1-YR [2.48"]2-YR [2.86"] 10-YR [4.26"] 100-YR [7.32"] <br />EX1 5.62 6.56 10.03 17.63 <br />EX2 0.29 0.37 0.69 1.44 <br />TOTAL 5.91 6.93 10.72 19.07 <br />1-YR [2.48"]2-YR [2.86"] 10-YR [4.26"] 100-YR [7.32"] <br />PR1 (1P) 0.27 0.27 0.81 3.87 <br />PR2 0.9 1.16 2.18 4.55 <br />TOTAL 1.17 1.43 2.99 8.42 <br />Overall Stormwater Rate Summary <br />1-Year Event 5.91 1.17 <br />2-Year Event 6.93 1.43 <br />10-Year Event 10.72 2.99 <br />100-Year Event 19.07 8.42 <br />Stormwater Water Quality and Volume Summary <br />New Impv. Area (sf) Required Volume (cf) <br />PR1 51989 4766 <br />PR2A 2107 193 <br />TOTAL 54096 4959 <br />Inf. Area (sf) Assoc. Inf. Height (ft) Drawdown Time (h) <br />Infiltration Basin 1 5684 7252 0.78 5.88 <br />TOTAL 5684 <br />Proposed BMP Area Provided Vol (cf) <br />Existing Conditions <br />Rate (cfs) <br />Proposed Conditions <br />Rate (cfs) <br />Drawdown Time Calculations (1.6"/Hour) <br />Required Infiltration Vol. Summary Infiltration Volume = <br />1.1"*Dist. Impv. Area <br />Drainage Area <br />2401 LOWRY AVE NE <br />Pervious Area Total Area <br />Existing Conditions <br />Proposed Conditions <br />Drainage Area Impervious Area <br />Total AreaImpervious AreaDrainage Area Pervious Area <br />Existing Rate (cfs)Drainage Area <br />Stormwater Rate Summary <br />Drainage Area <br />Site Area Summary <br />Proposed Conditions Rate (cfs)