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<br />Hydrologic Curve Number Computation Sheet <br /> <br />landforM <br />~~ <br /> <br />Site Westem Auto Proposed ... ...'iWi\!ii\: <br />Project # EM95001 Existing <br />Location Roseville Preparer S Johnston <br />Basin Site I Date 7/6/95 <br /> <br /> Q) Q) Q) Q) <br /> C) .!!l C) .!!l C) .!!l C) .!!l <br /> Acres Per ctI ctI ctI ctI <br />Land Use Description 'E '0 'E '0 'E '0 'E '0 Product <br />Practice Q) U) Q) U) Q) U) Q) U) <br /> u <( ~ ID ~ () ~ 0 <br /> Q; Q) Q) Q) <br /> (L (L (L (L <br />Cultivated Land: without conservation treatment 72 81 88 91 0 <br />Cultivated Land: with conservation treatment 62 71 78 81 0 <br />Pasture or Range Land: poor condition 68 I 79 86 89 0 <br />Pasture or Range Land: good condition 39 i 61 74 80 0 <br />Meadow: good condition 30 58 71 78 0 <br />Wood or Forest Land: thin stand, poor cover, no mulch 45 66 77 83 0 <br />Wood or Forest Land: good cover 25 55 70 77 0 <br />Open Space, Lawns, Parks, Golf Courses: good condition 0.6 39 61 100% 74 80 44.4 <br />Open Space, Lawns, Parks, Golf Courses: fair condition 49 69 79 84 0 <br />Commercial and Business Areas (85% impervious) 89 92 94 95 0 <br />Industrial Districts (72% impervious) 1 81 88 91 93 0 <br />Residential: average lot size 5500 s.f., 65% impervious I 77 85 90 92 0 <br />Residential: average lot size 11000 s.f., 38% impervious 61 75 83 87 0 <br />Residential: average lot size 14500 s.f., 30% impervious 57 72 81 86 0 <br />Residential: average lot size 22000 s.f., 25% impervious 54 70 80 85 0 <br />Residential: average lot size 1 acre, 20% impervious 51 68 79 84 0 <br />Residential: average lot size 2 acre, 15% impervious 47 65 76 82 0 <br />Farmsteads 59 74 82 86 0 <br />Paved Parking Lots, Roofs, Driveways 1.90 98 98 1100% 98 1 98 I 186.2 <br />Streets and Roads: paved with curb and gutter 98 98 001 98 0 <br />Streets and Roads: gravel 76 85 89 91 0 <br />Streets and Roads: dirt 72 82 87 89 0 <br />Open Water Lakes or Ponds 0.3 100 100 100% 100 100 30 <br />Swamp with 1/3 Open Water 85 85 85 85 0 <br />Swamp with No Open Water 78 78 78 78 0 <br />Other I 0 <br /> 1 0 <br /> <br /> <br />Total Acres <br /> <br />Product Total <br />Weighted Runoff Curve # <br /> <br /> <br /> Storm #1 Storm #2 Storm #3 Units <br />Frequency 2 10 100 Year <br />Rainfall 2.7 3.8 6.1 Inches <br />Runoff Q 1.95 3.05 I 5.30 Inches <br /> <br />Landform Engineering Company, 905 Twelve Oaks Center, 15500 Wayzata Blvd., Wayzata, MN 55391, (612) 475-3272, Fax/Data (612) 475-3159 <br />