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Bulkhead Design <br />Page 4 <br />Volume per linear ft of seal = (2' x 1" x 75') + 2 [#(75 tan 90-66 ) 75] <br />= 150 ft3 + 2,504 ft3 <br />= 2,654 ft3 <br />Weight of rock = 150 lbs/ft3 x 2,654 ft3 = 398,100 lbs <br />Pu = 1.7 P1 = 1.7 x 398,100 lbs = 676,770 lbs. <br />Pu/Q = 676,770 lbs - 0.700 = 966,814 lbs = 3,357 psi <br />Po = 0.85 f'c (Ag - Ast) + fy Ast <br />= 0.85 (3000 psi) (288 in2 - 7.62 in2) + 60,000 psi x 7.62 in` <br />= 714,969 lbs + 457,200 lbs = 1,172,169 lbs <br />= 4070 psi > 3,357 psi .. ok <br />