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i <br /> ITable 1-5.6 SCS Runoff Curve Numbers <br /> ILAND USE DESCRIPTION CURVE NUMBERS BY <br /> HYDROLOGIC SOiL GROUP <br /> p g C D <br /> ICultivated Land winter condition 86 91 94 95 <br /> Momuain�pen ar:a low growing brush& grasslands 74 82 89 92 <br /> � Meadow or pesture 65 78 85 89 ��� �` i <br /> Wood orfores[ land undisturbed 42 64 7 81 � <br /> � youn¢second growth or brush 55 72 8l g6 DEV� <br /> Orchard with covercrop 8� 8$ 92 94 <br /> I Open spaces(laµ�s.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 /> Gravel roads and parkin¢lots <br /> 76 85 89 91 <br /> Dirt roads and pazkin¢ lots 72 82 87 g9 pEJ <br /> � avement.roofs,etc. 98 9$ $ 98 <br /> Impervious surfaces P <br /> Open water bodies lakes.wetlands, ponds,etc. 100 100 100 l00 <br /> Single family residential(1) <br /> � Dwelling UnidGross Acre %Impervious <br /> � 0 15 Separate curve <br /> � 5 Zp numbers must <br /> I � � ZS be selected for <br /> � S 30 pervious and <br /> I 3.� 34 impervious <br /> � 5 38 portions of the <br /> ,� p 4Z site or basin <br /> ' ,� 5 46 <br /> � 48 <br /> 5.0 <br /> 5.5 50 <br /> 6.0 52 <br /> 6.5 54 <br /> I �0 56 <br /> PRD's,multi-family, <br /> Icommercial. industrial <br /> I (1) The% impervious values assume that roof and driveway runoff is directed into the streedstortn system <br /> I <br /> � I-5-33 <br /> I <br />