Floating Slab-on-grade

[Geo11]

Hi
I need to design slab-on-grade 20ftx20ft (no support)-Floating but if need to support hydrostatic uplift pressure due to groundwater of height approx 5 ft. ?
How do i calculate design moment ? Can i consider simply supported foe 20 ft span ? one way ?
I do not see anywhere 2 way slab design for single span ?

 

[hokie66]

To resist hydrostatic uplift, you must either provide sufficient ballast or design the slab to resist the uplift in bending. For the latter, you must have supports. Perhaps you can better describe your problem.