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� <br /> � Table 1-5.6 SCS RunoffCurve Numbers <br /> � LAND USE DESCRIPTION CURVE NUMBERS BY <br /> HYDROLOGIC SOIL GROUP <br /> A B C D <br /> ' Culdvaud Laad winter condidon 86 91 94 95 <br /> Mamtain open uea low growiog brus6�Basslands 74 82 89 92 <br /> ' Meadow or pa�turo • 65 78 85 89 <br /> —�1• Wood or forest lend undisturbed 42 64 76 81 <br /> young second growt�or brush 55 72 81 86 <br /> ' Orchard with covercrop 81 88 92 94 <br /> �o���+�,P�+ <br /> ' Bolf co�uxs, landscaPin6.ex•) <br /> Good conditi� grass cover on>75%of uea 68 80 O 90 � <br /> Fair condition grass cover on 50-75Ye of area 77 85 90 92 <br /> ' Gravel rods and p�rking lots 76 85 89 91 <br /> Dirt roads and puicing lots 72 82 87 89 <br /> Impmious surfices pavement,roofs,etc. 98 98 9 98 <br /> Open wam bodies lekes,wetlands,Ponds,etc. 100 100 100 100 <br /> I Single family residendal(1) <br /> Dwelling Unit/Gross Acro � %Impervious <br /> � 1.0 15 Seperau curve <br /> 1.5 20 numbers must <br /> � 2.0 25 be selected for <br /> 2.5 30 pmious and <br /> 3.0 3A ' impervious <br /> � 3.5 38 portioas of the <br /> 4.0 42 site or basin <br /> 4.5 46 <br /> � 5.0 48 <br /> 5.5 50 <br /> � 6.0 52 <br /> 6.5 54 <br /> 7.0 56 <br /> ( PRD's,muld-family, <br /> commercial, industrial <br /> ( (1) The°/a impervious values assume that roof and driveway runoff is dirxted into the str�xt/stocro system <br /> 1 <br /> � <br /> � 1-5-33 � <br /> 1 <br />