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How to identify where water is leaking from underground sump

Thu May 03, 2012Total posts : 17
har
har
Join date: May 2012
Topic: How to identify where water is leaking from underground sump

Hi,
I've recently demolished my old sump and constructed a new sump since water storage capacity in the earlier one was too less.

It is about 15 days now, and I'm observing that water level keeps falling about 1 to 2 feet per day... Once it reaches a certain level , the rate decreases and is about 2 or 3 inches per day.

I have used good quality bricks and have used concrete to pack the space between the brick wall of the sump and the outside ground in all the sides.

I have also used the recommended mix of Dr.Fixit waterproof compound while plastering the inside wall of the sump.

I have inspected the walls and the floor and can't detect any noticeable cracks/gaps.

Question is :
is it too early to worry about leaking ? or does the new sump takes some time before it is fully cured ? If yes, how long does it normally take ?

if leak is still there, what are the options I have ? should i re-plaster the walls ? the floor ?

is there any paint/paste is available in the market which i can use ?

How much would be the approx. cost for these ?

Thanks in advance.

Rgds
krish


Thu May 03, 2012Post  #1
NV MANI
NV MANI

Join date: Apr 2012
Post subject: Water leak in sump

Dear krish,
What about the floor? Is it RCC flooring?
Did you see any entry of tree root through the sump wall?
NV Mani

 
Thu May 03, 2012Post  #2
har
har

Join date: May 2012
Post subject: re:

Dear Mani,

thanks for you reply.
For the floor, first we put big jelly stones(i think 40mm), on top of it muddy, on top of it concrete and during the last stages, one more layer of concrete mixed with waterproofing and then the final plastering.

no - no roots were detected. thru the sump wall.. there were some small roots while digging, which was the reason instead of just packing sand/mud between the sump brick wall and the outside, we packed the gap (about 3 or 4 inches) with concrete. this was done while the brick wall was being constructed for every 3 feet of brick wall was over, the packing with concrete was done.

Regards
krish
 
Fri May 04, 2012Post  #3
NV MANI
NV MANI

Join date: Apr 2012
Post subject: Inlet water line to sump

Dear Krish,
It is normal that water level in sump will drop to certain level,after water supply from mains stops(
when filled level of water in sump is above inlet valve of supply). Some water from sump can go back to supply line.
I have observed this in spite of provision of non-return valve.
Is this applicable in your case?
Regards,
NV Mani

 
Fri May 04, 2012Post  #4
har
har

Join date: May 2012
Dear Mani,

I understand about the water going back to supply line. But my concern is the water level is dropping even below the main inlet valve.

Am waiting for the water to be emptied (probably this weekend) and check the insides once more... any hints/tips on what to check ?

Rgds
krish
 
Wed May 09, 2012Post  #5
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008

Dear Krish

           After reading your prpblem, I am in view that the joints of floor and walls have some leak point, prepare cement concrete gola and finished it with cement shullary.

ii. That either you have done plaster with fine sand or not it finished with cement floating coat.

iii. Either your masonary joints are hollow or you have not platered the wall external face if done than not finished with cement coat.

In future when you want to construct a sump than made cement concrete wall finished it on next day with cement coarse sand plaster and cement sullary.

 
Mon May 21, 2012Post  #6
shabbir ali
shabbir ali

Join date: Sep 2009
Post subject: crack in under ground water tank

sir,

i have constructed under ground water tank with bricks wall & plaster with sand coarse & cement sallary two years ago, for last 4 month tank remained empty ,two  days ago  i had clean the tank when i notice a thin crack  vertical on  one wall of tank, please suggest how to repair this crack so that water does not leak.

                                                   thanks

 
Sat Jul 21, 2012Post  #7
sam_m400
sam_m400

Join date: Jul 2012
Sir

what you call this sump? where it is RCC sump or brick sump, as i am little confused.

What i heard is RCC sump need , steel rod across the sump/laying/filling with concrete mix 1:2:4 of kind 4 sides/floor of sump as well, then plaster it with water proofing compound.

Current one is talking about mixing with concrete, does it qualify for RCC sump being steel mesh not used. I feel it is brick one with no mesh used. But Guptajui suggesting to use cement floating coat/cement shullary/cement concrete gola.

does this needed for brick sump with mesh/water proofing ? 

Does this needed if i build a sump with RCC model with steel.

I need to ask my mason to construct based on your suggestion. Please explain
cement floating coat/cement shullary/cement concrete gola as my mason may not know these things?

Regards
Sam

 
Sat Jul 21, 2012Post  #8
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008
 

Dear Sam

It is right that brick wall sump is equally good. For constrution of sump do some care that

1. After excavation, compact the bottom of sump.

2. Lay cement concrete and compact it fully.

3. Construct wall either RCC or brick wall but brick wall should be 9'' thick not 4.5'' with cement mortar.It must be ensure that pipe should be laid during the masonary not after by bracking the walls.

4. Do cement plaster on both side and finish it with cement shullary on the same day .

5 lay the flooring and finish it properly.

6. Do curing for at least 7 days. I think your dout is clear.Floating coat is finishing with cement mixed with water.

 
Sun Jan 12, 2014Post  #9
SUBRAHMANYA RAMA SASTRY
SUBRAHMANYA RAMA SASTRY

Join date: Jan 2014
Sir,
Our Sump is more than 20 years old, just now it is start leakage and getting water level down. How to avoid this leakage.

Sump constructed with Mess with Plastering with Jelly  and nice Plastering cement.


Subbu
 
Mon Jan 13, 2014Post  #10
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008
Dear Rama Sastri
            Your sum is old, See the walls after drain of water. There may be cracks or the joints may have crack due to settling. So repair the cracks or if plster is broken than do the plaster as fresh plaster.
 
Sun Jan 19, 2014Post  #11
senthilkumar
senthilkumar

Join date: Jan 2014

Dear Gupta Ji,

In our newly built house,we found that water leakage in sump. Sump constructed with brick and plastered.During the handover time of house , tiles fixed inside all five sides of the sump. First time i filled the sump and found that water level is decreasing rapidly.I contacted water proof guys through phone but they said that as tile is fixed inside the wall and built with brick we need to spend money equal to cost of newly building sump.And he suggested to demolish the existing and construct with RCC.

It will be helpfull if you suggest on this.

Regards

Senthilkumar.S

 

 
Mon Jan 27, 2014Post  #12
prakash chandra
prakash chandra

Join date: Jan 2014
Post subject: UG sump leakage

Dear Sir/Madam,

We have around 9000ltr underground water tank. About 8months back we had leak in the tank so we called the water proofing expert and he filled the crack with the Sikaflex 15LM Sausage. over it he coated FOSROC NITOBOND SBR + CEMENT+WATER and over it FOSROC BRUSHBOND RFX LIQUID + FOSROC BRUSHBOND RFX POWDER + WATER. But now we face again the same issue of water leak. Can you please suggest some permanent solution using you products.Waiting for your reply.
Thank you,
PrakashBangalore
 
Wed Mar 12, 2014Post  #13
Aslaan
Aslaan

Join date: Mar 2014
Post subject: I will guide you how to Repair your sump by your...

Hi, I am Aslaan Malik from bangalore, india...
first let me tell my experience in repairing leaking water sumps...Although i am engineer but i repaired our two sumps mentioned below in details..
First you have to notice from where u r tank is leaking, by noticing tank level every day.
Our 13 yrs old sump started leaking 10-12 inches every day in 2011, its nearly 500 ltrs every day....so what i did is, when there was no water in the tank i took a good torch and inspected and what i found is around 25-30 holes...i will tell you how i repaired it.

We constructed our new tank in January 2014...In beginning our constructors said its a new tank so it drinks water, just wait for few days it will be fine, but even after one month it did not stopped every day more than 500 ltrs was leaking....
Here also i took torch  &  i inspected and found crack in wall and holes below every plastic-rubber steps...

So what is the solution...I fixed it in Just Rs.60...shocked here is the solution..
1)you must be heard of M-Seal which u can easily found in any hardware shops, buy it as per your requirement.
2)It comes in two solutions u have to mix it, just follow the instructions on m-seal box.
3)clean the surfaces where u have to apply m-seal, like cracks or holes.
4)now apply m-seal, but dont use water, if its very hard u may use just 2 or 3 drops water.make sure all holes or cracks are filled, for better fillings use u r thumbs and gently press the m-seal.
5)leave for drying for atleast 6 hrs, fill tank and check u r problem solved.
Thanks
Mohammed Aslaan Malik 


Attachments: 337.jpg Wed Mar 12, 2014,&n
 
Wed Mar 16, 2016Post  #14
taj
taj

Join date: Mar 2016
Post subject: water leakage in tank

Dear Krish,

Please let me know whether your problem is solved or not..
if so, how..?
since i am facing the same issue which you have faced.

Rgds,

Taj
 
Sun Jul 03, 2016Post  #15
Jeyaraman
Jeyaraman

Join date: Jul 2016
Post subject: water leakage in sump

Dear sir,

We have constructed a undergroundsump with RCC. We have observed ground water coming inside the tank. Our area we will get water on 8 feet.

We found the water incoming holes.
How to stop water?.
Thanks & Regards,
Jeyaraman
 
Mon Jul 04, 2016Post  #16
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008
Dear
       

After reading your problem, I am in view that the joints of floor and walls have some leak point, prepare cement concrete gola and finished it with cement shullary.

ii. That either you have done plaster with fine sand or not it finished with cement floating coat.

iii. Either your masonry joints are hollow or you have not platered the wall external face if done than not finished with cement coat.

Now you  should make sump empty  and make space out side the sump and than  finished  the wall outer and internal face  with cement coarse sand plaster and rendering with cement sullary and cursing made for 7 days.

 SECOND POTION, make cement concrete wall finished it on next day with cement coarse sand plaster and cement sullary.

 
Sat Jul 09, 2016Post  #17
alap
alap

Join date: Jul 2016
Post subject: How to build a water proof underground sump

We have 20 year old underground sump which is located under our garage. Few years back we had done some repair works as well. Recently we had issues where we had some some sewage water seepage into the sump when the main sewage line in the main road gets blocked. We even routed all our sewage lines away to backside from the tank to avoid any leakage but it again happened. There is about 6ft distance from the edge of the sump to main road. On top everything is concrete. 
While we identify the source of seepage we are considering building new sump but worried that the problem might still happen. So would like to know what are best practices in design.
- Can there be layer concrete wall /PVC wall put under ground at edge of garage and road to avoid any leakage coming in at all

- Building right sump.
 Came across the below article and also Indian Standard for building
https://law.resource.org/pub/in/bis/S03/is.6494.1988.html

I would appreciate input on these. 
 

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