Retaining wall with buoyancy presssure

[NEK ENGINEER]

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

 

[geomane]

Where is the gwt on the "dry" side? 

 

[NEK ENGINEER]

Where is the gwt on the "dry" side? 

Thanks Jmcc06! the gwt on the dry side is 3ft below the footing

 

[PowerStroke79_PE]

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

 

[ZEZO4]

Case I make more sense for me.