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<br />MN-ENG-73 <br />9-76 . <br />(File Code ENG-13) <br /> <br />J?IGURE 3-2 <br /> <br />U. ~ DEP....TMENT Of AGllCULTUII <br />SOIL CONSERVATION SlIV1CE <br /> <br />HYDRoLoGIC CURVE NUMBER COMPUTATION SHEEr <br /> <br />Watershe&V (' 57 <br /> <br />LAND USE FOR URBAN AREAS <br />Present oF1"uture~ <br />~, .I ~_o- <br />f/_,., a.. Si te 120 ~.5 TOrr:-l;J./ lC/ [) l~; E <br /> <br />Acres <br /> <br />Computed by <br /> <br />(' (~~) ? <br /> <br />Date N 'I 'rY>Checked by <br /> <br />Date <br /> <br /> Curve Numbers <br /> Acres Mois~ondition II <br /> LAND USE DESCRIPTION Per sO~lJ B ~O~lS D <br /> Practi.ce Soils Soils Product <br /> r-= <br />Cultivated Land: without conservation treatment 72 81 88 91 <br /> with conservation treatment 62 71 78 81 <br />Pasture or range land: poor condition 68 79 86 89 <br /> r;ood condition }CJ 61 74 80 <br />Meadow: good condition .. 30 58 71 78. <br />Wood or Forest land: thin stand, poor cover, <br /> no mulch 45 66 77 8'3 . <br /> good cover 25 55 70 77 <br />Open Spaces, lawns, parks, golf courses, ceme- <br />teries, etc. <br />good condition: grass cover on 75% or more <br /> of the area .~ t 3 () }CJ ~~:::) 74 80 )01."30 <br />fair condition: grass cover on 50% to 75% <br /> of the area 49 69 79 84 <br />COJllllercial and business areas (85% impervious) 89 92 94 95 <br />Industrial districts (7'21> impervious) 81 88 91 93 <br />Residential: <br />Average lot size Average % Impervious. <br />1/8 acre or less 65 77 85 90 92 <br />1 /4 acre 38 61 75 83 87 <br />1/3 acre 30 57 72 81 86 <br />1/2 acre 25 54 70 80 85 <br />1 acre 20 51 68 79 84 <br />Paved parking lots, roofs, driveways, etc. 51~f(t) 1.7{ 98 (98) 98 98 17/. ') <br /> ~/ <br />streets and roads: <br />paved with curbs and stonn sewers 98 98 98 98 <br />gravel 76 85 89 91 <br />dirt 72 82 87 89 <br /> - <br />Marsh (). :.J C) 8') ,_8')j ti5 ti5 .;21. J t) <br />Other <br /> <br /> <br /> <br />Weighted Runoff Curve No. Product Total <br />Total Acres <br /> <br />-14>.,~ <br /> <br />Product Total 3 ~4. 0 ~- <br />L'\'...~ C. N :: i 4 <br /> <br />Total Acres ~t;. 3 <br /> <br />3-4 <br /> <br />