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MN-ENG-73 9-76 (File Code ENG-13) J!'IGURE 3-2 U. So DI'AlTMINT Of AGIICULTUIf SOIL COHSIIVAI1ON SERVICE If:(DROLOGIC. CURVE NUMBER COMPUTATION SHEFI' ~ ~ LAND USE FOR URBAN AREAS ~e=' DC 1/' "_........~r Future ~~. . ...,....... Wa-ter~hed J,J e ~..- It 11-;;'--;") Site D.A. ....... ------ ....- Ac res Computed by c;..w p Date I 0 ~t 1 ~ ~Checked by Date Curve Nwnbers Acres Moisture Condition II LAND USE DESCRIPTION Per so~C B ~O~lS D Practice Soils Soils Product "- ~. 88 Cultivated Land: without conservation treatment 72 91 with conservation treatment 62 71 78 81 Pasture or range land: poor condition 68 79 86 89 <<ood condition )CJ 61 74, 80 Meadow: good condition 30 58 71 78 Wood or Forest land: thin stand, poor cover, no mulch 45 db 77 lb. '68' good cover I. C. 25 70 77 Open Spaces, lawns, parks, golf courses, ceme- teries, etc. good condition: grass cover on 75% or more 4."~ 11) ;l. ~>-- of the area ?fl. 74 80 fair condition: grass cover on 50% to 75% of the area 49 69 79 84 Conmercial and business areas (85% impervious) 89 92 94 95 Industrial districts (72$. impervious) 81 88 91 93 Residential: Average lot size Average % Impervious 1 /8 acre or less. 65 77 85 90 92 1 /4 acre 38 61 75 83 87 1 /3 acre 30 57 72 81 86 1 /2 acre 25 54 70 80 85 1 acre 20 51 68 79 84 Paved parking lots, roofs, driveways, etc. (). ~ :t 98 @ 98 98 (,/ Streets and roads: paved with curbs and storm sewers 98 98 98 98 gravel 76 85 89 91 dirt 72 82 87 89 Marsh tl5 8e:; tl5 tl5 Other Total Acres 6.lJ Weighted Runoff Curve No. Product Total Total Acres G, :2 -~ Product Total ~ l..vlQ. ~ 3 :. C N 3-4