While you will need to apply the hydrostatic pressure for finding out the forces on the wall and for the static analysis in general, for the dynamic analysis I think you would be more interested in accounting for the water mass.
In my post below, you will find some recommendation about water mass modeling. Although this specific post talks about a time history analysis but when it comes to accounting for mass, the process is the same for any kind of dynamic analysis.
communities.bentley.com/.../358455
In my post below, you will find some recommendation about water mass modeling. Although this specific post talks about a time history analysis but when it comes to accounting for mass, the process is the same for any kind of dynamic analysis.
communities.bentley.com/.../358455