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<br />Hydrologic Curve Number Computation Sheet <br /> <br />landfotm <br />~~ <br /> <br />Site <br />Project # <br />Location <br />Basin <br /> <br />Westen Auto <br />EM95001 <br />Roseville <br />Site <br /> <br />Proposed <br />Existing <br />Preparer <br />Date <br /> <br /> <br /> Q) Q) Q) Q) <br /> C) .!El C) .!El C> .!El C) <br /> Acres Per m m m m .!El <br />Land Use Description c: '0 c: '0 c: '0 c: '0 Product <br />Practice Q) (/) Q) (/) Q) (/) Q) (/) <br /> ~ <( ~ (D u () u 0 <br /> Q) Q) Q> Q> <br /> a... a... a... a... <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 79 86 89 0 <br />Pasture or Range Land: good condition 39 61 74 80 0 <br />Meadow: good condition 30 58 71 I 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 39 61 74 80 0 <br />Open Space, Lawns, Parks, Golf Courses: fair condition 1.1 49 69 100% 79 84 86.9 <br />Commercial and Business Areas (85% impervious) i 89 92 94 95 0 <br />Industrial Districts (72% impervious) 81 88 91 93 0 <br />Residential: average lot size 5500 s.f., 65% impervious 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 sJ., 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 1.70 98 98 100% 98 98 166.6 <br />Streets and Roads: paved with curb and gutter 98 98 98 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 100 100 100 100 0 <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 0 <br /> 0 <br /> <br /> <br />Total Acres <br /> <br />Product Total <br />Weighted Runoff Curve # <br /> <br /> <br /> Storm #1 I Storm #2 I Storm #3 Units <br />Frequency 1 I 10 I 100 Year <br />Rainfall 2.3 I 4.2 I 6.0 Inches <br />Runoff Q 1.85 I 2.95 I 5.20 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 />