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KING COUNTY, W.ASHINOTON, SURFACE WATER DESIGN MANUAL <br />TABLE 3.52111 SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS _ I <br />SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS (Published by SCS In 1982) <br />Runde curve rsenbsrt IN selected agricultural, suburban and urban land use IN Type IA <br />rakaal distribution, 21 hour alarm durelkn. <br />CURVE NUMBERS BY <br />HYDROLOGIC SOIL GROUP <br />LAND USE DESCRIPTION <br />A B C D <br />CJIMted [a (1) <br />winter cadllan <br />66 91 9e 95 <br />Mountain open areas. <br />Iry growklg brush and g,.W ndf <br />74 62 69 92 <br />Meadow or paelue. <br />.. <br />65 76 a5 09 <br />Wood a lorest lard'. <br />undisturbed <br />e2 6e 76 BI <br />Wood or last land: <br />yang second growth or brush <br />55 72 61 66 <br />Orchard. <br />w9h cover crap <br />61 66 92 91 <br />Open epacm. lawns, parks, golf Causes, cemeteres. <br />%ndKapklg. <br />good cedition'. <br />9rem caw on 75% <br />or more d the arm <br />69 90 66 9n <br />laic wldlbn: <br />grass caw on 50% <br />' <br />77 05 90 92 <br />to 75% of the use <br />Gavel roads and parkklg kAs <br />.-- <br />76 a5 69 91 <br />Din rands and parkklg has <br />72 62 07 69 <br />ImpMvbtR srklaue, pavemea. rada. etc. <br />96 90 9e 90 <br />Open water bodW' <br />takes, wetlands, ponds. eta <br />100 100 100 101) <br />Shoe Femly Residential (2) <br />Dwelklg Un1/Gmea Acre <br />% Impervkrn (0) <br />10 DU/GA <br />15 <br />Separate cove number <br />1.5 DU/GA <br />20 <br />"1 be selected <br />2 o DU/GA <br />25 <br />IN pervkws and <br />2.5 DJ/GA <br />00 <br />knpervbta portion <br />0.0 DU/GA <br />01 <br />d the sAs a basin <br />0.5 DU/GA <br />08 <br />1.0 DU/GA <br />e2 <br />e.5 DU/GA <br />46 <br />5.0 DU/GA <br />10 <br />5.6 DU/GA <br />50 <br />6.0 DU/GA <br />52 <br />6.5 DU/GA <br />5e <br />7.0 DU/GA <br />56 <br />Planned 1M developrents, <br />% krlpervbue <br />mdomlYura, opartmerls, <br />rtaw be caryrled <br />coranarcW bminass and <br />Industd ' arms <br />c....4.wMn <br />(1) For a mere del31e0 41"Crlpnal Or 99nCU rue -nu van ,.ur.w 1-1 ,.. <br />/landbook, Section e, Hydrdogy. Chapter 9. Augal 1972. <br />(2) Assures rod and drMway riot 1s directed k10 evest/Nam syslem. <br />(3) The rsmakerV pervious arms pawn) are coraldw0d 10 oe In goad condkbn IN have cues numbers. <br />3.5.2.3 <br />V90 <br />