.\ p^ s 150 tan^ 30° 



» 50 pounds per square foot 



* presKvire due to surcharge load alone exerted by the drained 

 fill 



B (120 X i; + 150) tan^ 30° 



s 210 pounds per square foot 



s pressure due to surcharge W]^ and drained backfill. 



Considering the surcharge plus drained backfill to be a new surcharge 

 applied to the saturated fill with a pressure of W2 s W]^ ,, + ll^ ) « 630 



1 wi " 



pounds per square foot, then ' 



. 6:30 tan^ (32,5°) 



a 256 potinds per square foot 



= pressure due to surcharge W2 alone exerted by the saturated 

 f il"] 

 Pi,. W2(h2..^)tan2( 901:^2) ^^2) 



, ClUO X 3 + 630) tan^ (32,5°) 



= U26 pounds per square foot 



= pressure due to surcharge ¥2 and saturated backfill. 



328. Below the low water line, hydrostatic pressure on the land 

 side of the wall would be balanced by the water in front of the wall. 

 Accordingly, these pressures may be ignored. Again, considering the 

 surcharge plus the drained backfill plus the saturated fill to be a new 

 surcharge, 



W-3 a Wo (h? + -^) s 10^0 pounds per Square foot. 



J *• Wo 



then pe 4P Wo X —-2 tan^( -3) (93) 



-^ -^ Wj 2 



- 1050 tan^ (32.5°) 

 160 



