I have tried by assigning non uniform load on the wall in etab and I faced problem of finding value of (A,B,C,D )but later I have prepare a sheet excel to find (A,B,C,D ) from some input value shown in high lighted blue I will try to attach the excel sheet here and it is use full only for lateral water forces for tank or swimming polls and I will try to prepare additional sheet for other type
WATER FORCE ON WALL.xlsx