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SCS table <br />Tciblt3 3.16 Runafl` Curve Numbers. far Selected Land Uses {Sail Canservatian St;tvice, 1986) <br /> Hydrologic soil group <br />land use description A ~ B "C D <br />Cultivated land° <br />Without conservation treatraunt 72 $! 88 91 <br />Wa[h Gonservattan treapnent b2 71 78 $I <br />Pasiur6 ar range land <br />Poor condition 68 79 g6 89 <br />Good condition. 39 bl 74 8t? <br />Meadow <br />Gaud condition fit) 58 71 7$ <br />Wood ar forest land <br />Thin stand, poor cover, na mulch AS bb 77 $3 <br />Goad coven' 25 53 70 ?7 <br />t7pcn Spaces, lawns, barks. golf t;aaurses, cemeteries, etc. <br />Good condition (gross cover on 7S9'o or more at the aria) 39 6 t 79 80 <br />Faircandition {grass cover on S4 to 7S'~ of the area) d9 69 79 84 <br />Commercial and business areas (HS°k impervious) g9 92 94 4S <br />Industrial districts (72~ impervious) 81 8g 91 93 <br />ResidentiaJf" <br />Average lot siu Average percentage impervious'z <br />acre or less 6S 77 gS 9U 92 <br />;acre 38 Gl ?S 83 87 <br />acre 3tl 57 72 SI ~ !i8 <br />acre 25 54 70 g0 gS <br />i acre 2U S I . 68 79 84 <br />Paved parking lots., roots, driveways, ctc.~ 98 98 98 9R <br />Sttaeets and roads <br />Paved with curbs and storm s.ewers'' 9ll qg 98 9g <br />Gravel 7fi 8S g9 9l <br />L1irt 72 82 8? 89 <br />°1"or a more detailed description of agricultural and land use curve numbers refer to '"l+tatronal <br />Engineering Handtxaok.'° Sect, dr „Hydrology" Chap. 9, 1972. <br />"Good cover is protected frcam grazing, litter, and brush cover soil. <br />KCurve numbers are computed assuming the runoff from the house and driveway is directcti toward the <br />street wiUa a minimum of root water directed m lawns where additional infiltrations could occur. <br />'The remaining pervious areas (lawn} are oonsidered to be in good pastaro condition for these curve <br />numbers. <br />°In soma warmer climates of the country a curve number of 9S may tae aced. <br />Attachment 2.05.3(3)-20-41 <br />