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1. Typical RCC sump. How much will it be extra compared to normal cement blocks?

2. Cement Block Sump. Cost wise good, but any down side ?

3. One of my friends suggested, having a pit which is cement plastered, and just keep a huge Syntex water tank ( > 5000 ltr ). He told me many advantages (listed below) for this . Has any body done this ?

* Syntex has inlet and outlet valves in its sides and it top opening can be kept tightly closed. This prevents any dust , cockroaches other waste getting inside the sump. In the typical metal lids of sumps, dusts while moping and cocroaches get in side, it seems.
* Once in 2-3 years, the entire tank can be taken outside, and washed much better than cleaning a sump.
* Cost wise it seems this is better.
* Tree roots breaking the sump walls can be prevented.

Please let me know your thoughts.

It does seem like a good idea indeed as can be seen on the Sintex sie as well http://sintex-plastics.com/Under_G_Tank.htm

Howeve the height of the tank appears the about 7ft, the height of a std door which could be a possible deterrent. It will be good to have the expert views of Praveen and others on this.

in my opinion effort is considerably same as any other type. Say for a 5000 ltr tanks

1) Here also you need to prepare at least 8X8X8 ft pit and you need to plaster the pit atleast to a decent quality.

2) Inserting or lifting the tank is not a simple job. it needs a professional plumber help every time to detach and reconnecting the pipe connections/sealing.
It needs atleast 3-4 man power to do this job, not b'cos its heavy weight, but considering the dimension of the tank.

3) you need to close the pit either using RCC/concrete block or by steel casing. Again there will be lot of open areas within this pit( outside the tank), which attracts dust, cocroaches, water seepage(if proper water proofing is not done), tree roots breaking the pit wall.....etc.

needs more systematic analysis rather than just the cost benefit.

I too have been evaluating such options. Do not even consider the conventional brick plastered sumps....they are just not durable, inspite of the best water proofing/ plastering used. The options will boil down to Sintex/ RCC sumps. As regards to RCC sump, the labour cost works to 1.50 rs/ Litre (1 cubic SFT = 22Lts). I am not very sure about the material cost. One disadvantage with regards to sintex is, what happens if there develops a crack??? There are atleast 2 tanks in my layout, which had to be replaced in full & RCC built in its place.

PS: Can someone correct me if I am wrong on the Lts/ CFT figures??

Hi,
One of the options i am following is, i have done an underground sump using cement block laid perpendicular so that the wall is 16" deep. After that i was able to get wasted ceramic wall cladding tiles (or u can use your left over flooring tiles also) from godown for free (they will have lot of waste peices some could be non-moving patterns). I used these tiles and did the cladding for inner walls and floor using epoxy and grout. By doing this my tank maintenance will be very easy as you can mop these tles and finally mop with dry cloth.
This i have seen few people doing it for big projects also.
Thanks

Thanks for all your reply. Looks like the closure of this is , RCC is the winner !!

Btw m3_07,

1Cft = 28.3 ltrs.

Hi,
In my opinion rcc would be best option ,cleaning a sump is same with tiles or with out.unless it is exposed to sun light I dont think any sticky fungus forms on the walls or floor.mostly it is dust,calicium settlements found in any sump.brick tank with sintex you may need to use square rather than round to save space.cost wise it will be more or less like rcc.


Regards
Ar.Praveen.n
Ardes architects and interior designers
ardesarchitects@gmail.com

Hi Jackalbda,
how much was your RCC sump size and total cost?
for my 10k lit, contractor has quoted 1.10lac

I finally dint go for RCC...went for cement block ( Apco 6" block ) sump only...

Hi All,

This is how my house sump was built. Initially plan was to go for only RCC walls on all side and at the flooring, later my architect suggest to have 4inch wall constructed on all side after flooring ( after 1:4:8->concrete->Smooth Finish). Then we had 4inch concrete done, upon which plastering was done.
Reason we were suggested to have 4inch wall to avaid having centering sheet laid behind this RCC wall. Since removing those sheet is bit difficult and to avaid more pit dig to have installation of centering sheet.
Note: Architect suggested, if centering sheet where not plasted most of the concrete go into the ground which is of no use.

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