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Drainage Calculation Summary
Civil Site Group - Stormwater Calculations Area [SF] CN Value Area [SF] CN Value Area [SF] CN Value EX1 (TO WETLAND/CREEK)0 98 118917 61 118917 61 EX2 (TO ADJ. PROPERTY)0 98 21451 61 21451 61 EX3 (TO 78TH ST)0 98 14883 61 14883 61 Area [SF] CN Value Area [SF] CN Value Area [SF] CN Value PR1 (TO WETLAND/CREEK) 0 98 66969 61 66969 61 PR2 (TO ADJ. PROPERTY) 0 98 7308 61 7308 61 PR3 (TO 78TH ST) 1253 98 3029 61 4282 72 PR4 (TO 1P)53142 98 23550 61 76692 87 Impervious [SF] Impervious [AC] Pervious [SF] Pervious [AC] Total [SF] Total [AC] Existing Site 0 0.00 155251 3.56 155251 3.56 Proposed Site 54395 1.25 100856 2.32 155251 3.56 2-YR [2.80"] 10-YR [4.18"] 100-YR [7.40"] EX1 (TO WETLAND/CREEK)1.68 6.01 18.45 EX2 (TO ADJ. PROPERTY)0.30 1.08 3.33 EX3 (TO 78TH ST)0.21 0.75 2.31 TOTAL (REACH)2.20 7.85 24.08 2-YR [2.80"] 10-YR [4.18"] 100-YR [7.40"] PR1 (TO WETLAND/CREEK) 0.95 3.39 10.39 PR2 (TO ADJ. PROPERTY) 0.10 0.37 1.13 PR3 (TO 78TH ST) 0.17 0.38 0.86 PR4 (TO 1P)0.21 0.25 2.20 TOTAL (REACH)1.40 4.35 12.70 Overall Stormwater Rate Summary 2-Year Event 2.20 1.40 10-Year Event 7.85 4.35 100-Year Event 24.08 12.70 Stormwater Rate Summary - To Country DriveTo Creek/Wetland 2-Year Event 1.68 0.95 10-Year Event 6.01 3.39 100-Year Event 18.45 10.39 Stormwater Rate Summary - To Spruce StreetTo Filtration Basin 2-Year Event 0.00 0.21 10-Year Event 0.00 0.25 100-Year Event 0.00 2.20 Stormwater Rate Summary - To Adjacent Property 2-Year Event 0.21 0.21 10-Year Event 0.75 0.25 100-Year Event 2.31 2.20 Stormwater Water Quality and Volume Summary New Impv. Area (sf) Required Volume (cf) PR1 (TO WETLAND/CREEK) 0 0 PR2 (TO ADJ. PROPERTY) 0 0 PR3 (TO 78TH ST) 1253 115 PR4 (TO 1P)53142 4871 TOTAL 54395 4986 Inf. Area (sf) Assoc. Inf. Height (ft) Drawdown Time (h) Filtration Basin 1 (952.00- 955.50)18446 7192 2.56 19.24 TOTAL 18446 Proposed BMP Area Provided Vol (cf) Existing Conditions Rate (cfs) Proposed Conditions Rate (cfs) Drawdown Time Calculations (0.8"/Hour) Existing Conditions Rate (cfs) Proposed Conditions Rate (cfs) Required Infiltration Vol. Summary Abstraction Volume = 1.1"*Dist. Impv. Area Existing Conditions Rate (cfs) Proposed Conditions Rate (cfs) Drainage Area Existing Conditions Rate (cfs) Site Area Summary Existing Rate (cfs) Proposed Conditions Rate (cfs) Moments of Chanhassen Pervious Area Total Area Existing Conditions Proposed Conditions Drainage Area Impervious Area Total AreaImpervious AreaDrainage Area Pervious Area Proposed Conditions Rate (cfs) Drainage Area Stormwater Rate Summary Drainage Area