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KING COUNTY, WASH [ NGTON, SURFACE WATER DESIGN MANUAL <br /> �_ (2) CN va�ues can be area weighced when they apply to pervious areas of similar CN's (within ?.0 <br /> CN pointsl. However, high CN areas should n�t be combined with low CN areas (unless the <br /> - low CN areas are less than 15% of the subbasi�l. In this case, separate hydrographs should be <br /> generated and summed to form one hydrograph, <br /> FICURE J.5.2A HYDROLOGIC SOIL CROUP OF THE SOILS IN ICING COUNTY <br /> HYDROLOGIC HYDROLOGIC <br /> SO�L GROUP GROUP• SOIL GROUP C 10UP• <br /> Alde�wood C Orras Peat 0 <br /> Arents, Alderwood Material Oridia � <br /> Arents, Everett Malerial B Ovall C <br /> Beausite C PBchuck C <br /> Bellingham D Puget � <br /> Briscot D Puyallup B <br /> Buckley D Ragnar B <br /> Coastal8eaches Varuble Renton � <br /> Eadmont Siit loam D Riverwash Variabla <br /> Edgewick C Salal C <br /> Everett A/B `Sammamish D <br /> Indianola A Seattle � <br /> Kitsap C Shacar • . D <br /> Idaus C Si Slt C <br /> Mixed All�via! Land Variable Snohomish � <br /> Ne}�o� A Sultan C <br /> Newberg B Tukw�a � <br /> � Nooksack C Urban Vartable <br /> Normal Sandy Loam D Woodinv0le � <br /> HYDROLOGIC SOIL GFiOUP CLASSIFlCATIONS <br /> A. (Low runoN potential�. So�s having high infill2tion rates, even when thoroughly wened,and consisting <br /> chielly ot deep,well-to�excessively d2ined sands or g2vels. These sods have a high rate ot water <br /> transmission. <br /> 8. (Moderately low runoH potential). So�s having mode2te infJtrdtion retes when thoroughly wetted, and <br /> consisting chiefiy o(moderacely fine ta moderately coarse textures. These soBs have a modera[e rate of <br /> water transmission. <br /> C. (Moderately high runoH potentiai). So�s having slow tn�i tration 2tes when thoroughly wetted, and <br /> consisting chiefiy of so�s with a layer that Impedes dowmvard mavement of water,a soas with moderately <br /> fi�o to line textures. These sods have a slrnv rate of wat¢r transmission. <br /> D. (High runoH potenttal). So1s having very slow infilt�ation rates when thoroughly wetted and consisting <br /> chie(ly of clay sols with a high swelling potential, soils with a pertnanent high vrater tabie.soBs wilh a <br /> hardpan or clay layer at or�ear the suAace, and shallow sols over neaAy impervious material. These soils <br /> have a very siow rate of v.ater transmission. <br /> • From SCS,TR-S5, Second Edition,June 1986, Exhibit A-1. Re�sions rt+ade Irom SCS,So� Interpreutton <br /> Record, Form M5, September 1988. <br /> .G�. J.5.2-2 I U92 <br /> �y <br /> ��1'} <br />