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r � . � <br /> � Table 1-5.6 SCS Runoff Curve Numbers — <br /> � LAND USE DESCRIP'['IVN CURVE NUMBERS BY � <br /> HYDROLOGIC SOfL GROUP <br /> � A B C D <br /> Cultivated Land winter condition 86 91 94 95 <br /> Mountain open area low growing brush&grasslands 74 82 89 92 <br /> � Meadow or pasturc 65 78 85 89 <br /> Wood or forest land undisturbed 42 64 76 8l <br /> young second growth or brush 55 72 81 86 <br /> � Orchard with cover crop 81 88 92 44 <br /> Open spaca(Iswns, parks, <br /> golf courses, landscaping,etc.) <br /> � Good condition grass cover on>75%of area 68 80 86 90 <br /> Fair condition grass cover on 50.75%of area 77 85 90 92 <br /> (' Grevel roads and parking lou 76 85 89 91 <br /> L Dirt roads end parking lots ?2 82 89 <br /> Impervious surfaces pavement,roofs,etc. 98 98 98 98 <br /> � Open water bodies lakes,wetlands, ponds,etc. �00 100 100 100 <br /> Single family rcsidential(1) <br /> Dwe!ling UnidGross Acre % Impervious <br /> �_ 1.0 15 Separate curve <br /> �,5 20 numbers must <br /> � 2.0 25 be selceted for <br /> 2.5 30 pervious and <br /> 3.0 34 impervious <br /> � 3.5 38 portions of the <br /> 4.0 42 site or basin <br /> I 4.5 46 <br /> 5.� 48 <br /> 5.5 50 <br /> � 6.0 52 . <br /> 6.5 54 <br /> 7.0 56 <br /> fPP.D's,multi-family, <br /> commercial, industrial <br /> 1 <br /> (I) The% impervious values assume that roof and driveway runoff is dirccted into the strcedstortn system <br /> I <br /> I � <br /> � <br /> � I-5-33 <br />