Retaining wall with buoyancy presssure

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NEK ENGINEER

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I know it may be a simple question but I am not sure how to calculate the uplift force due to buoyancy pressure for the retaining wall with water at top of the wall. Please see the attached file for 2 difference cases to calculate the uplift force. I don't know case 1 or case 2 are the correct way. Case 2 is the formula from FEMA 259 source. Any comments are much appreciated. Thanks!

View attachment Sdiv22300617032409500.pdf

 
Is that free hand on your diagrams?!! No matter what I try my drawings are always horrible!! Good for you...! 

 

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