--BCB•EffectofGroundWater Table:The Terzaghi analysis above assumesGWTis far below the foundation, i.e. greater than adepth of B below footing.(d" B where d is depth to GWT below footing).;(\S-lilng11s:t,~e....GJtable 's at east B belowthe~o_o.Jing,then use the paltially..saturate.cL\@!!J_e,1m.If theG.WIis:higher, theny.must be used for long term (eltective stress) analys.es.aIf 0-<-8ut still below the footing:•Then must modify YinNypart of BC equation. This y comesfrom the passive pressure and represents the average y justbelow the footing (over a depth = B).Bd1.d ('Jreplaceywith=B[Ymd+Y'(B-d)l=~OfB Ym-Ywhere"i=YbOOyarll=Yb=(Ysal-'¥W)BYmy'noteif d = 0ifd"Bthen have water at base of foundation and:y= y'then have water at depth and Y = YmThen must also modify
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