Please help me to sort out this issue.
Actually, I am modeling an underground rectangular water tank of 13m x 10m with top slab on it .
Top slab is supported on side walls and intermediate beams in between the slab.
After assigning all the loads, analysis done. Top slab is behaving as a whole without considering the intermediate beams.(i.e. slab is spanning for whole length )
Hence the slab thickness arrived was very huge.
There is no definitive answer to this question as water tank top slabs can behave in a number of different ways. Some tanks may experience more frequent leaks, while others may not experience any leaks at all. It is generally recommended that water tank top slabs be inspected and replaced as needed, depending on their age and condition.