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Hi All,
Can any one help me with stages of underground sump construction
( I feel its one of the important task - as we suffered a leaking tank in my native)

The stages I know
1) dig - by calculating the capacity ( I am going for 5ft width * 10 ft long * 6 ft depth - which aprox to 7000 ltrs - after factoring motor/wire space) - this is in progress now
2) lay bricks (red) on 'all' the sides ( minus the top) - fill mud between brick and digged wall ( to fill gaps)
3) make edges curvy - so that pressure is uniformly distributed
4) mix a waterproof liquid with cement/sand mix -and plaster - not sure which water proofing to use

Some time I hear people talking about iron mesh - not sure if that is required - and when

Please let me know your thoughts - so that I got to my contractor - with my 'home work' done.

Regards

You can use Mr.Fixit water proofing liquid. Have used 5ltr for my 10k ltr sump. It costs around 550/-
Yes, good iron mesh needs to nailed to the brick construction. This needs to be done before plastering of the sump. Iron mesh will help in evenly distributing the water pressure( as per my contractor) and also helps in avoiding leaks.

If money is not a constraint, there is nothing better than the RCC sump.

Not sure - if I got the notion of "RCC sump" - how different is that of what I described in my initial thread ?

Regards

RCC Sump is where the walls are built using RCC (Steel and concrete, like your roof slabs). In your opening thread, you mentioned brick walls.

In my case, this seems to be the order (still under construction)
1. Excavation - done
2. Brick Masonry - done
3. Slab to cover sump - done
4. Am told a mesh will be put all around - to be done
5. Plastering with a water proof liquid - to be done
6. Am told some additional water proofing coating will be done on top of plaster. not sure what this is - to be done.