How to drain grey water in clay ground in safe and secured manner

Question

I have a building which sits on top of clay ground so I couldn't soak away the grey water.

I explored solutions like leechfield,soakaway,cement ring well but all fails in clay ground.

I'd like some insights on how to handle the grey water coming from my building. approx 1800L per day like some technique to send the water into earth or is there any plant which can consume high level of water ?

There's no underground drainage system provided by local municipality as well.

The ground water table is at 8 to 10 feet(Salt water).

The town is part of bigger river delta(Kaveri or Cauvery)

I'd like to have a solution and manage the side effects as well

Any help would be appreciated

Update:

• I have empty ground on right and back side of building , as the ground is expensive I can't buy and use that as leech field

• The building has 3 houses one in ground floor and two in upstairs so it's like 10 or more people living in the apartment at any given time and with number of people are more so the grey water. The grey water is coming from washing clothes/utensils,bath room etc..

Here is my building foundation design

• I know RAFT foundation is best for any type of soil including saturated clay.

• My ground soil seems to be either clay or saturated clay

• I've asked for local professionals advice here are some suggestions from them this includes my own research as well

Solution 1:

Three cement ring wells ,one for each home and they said I'll have to keep the ring well between the pillars with 5 or 10 feet gap between each other. Each well should go upto 10 feet depth and last two feet has to be filled percolate materials and if water overflows then I will have to ask for moving tankers

Pros:

• Seems best one

Cons:

• I'm worried it might cause one side of building to sink as the soil might get loosened and some local professionals are agreeing that it could happen they can't guarantee but they said it's not likely to happen

Solution 2:

Buy the neighboring ground and use it a leech field

Pros:

• Seems good option as I don't have to dig any holes are which might affect building foundation

Cons:

• The ground is really expensive and not a good investment as the price might not soar much compared to other areas in town

• There's a good chance someone might start construction in this empty plots in next 5 years which is good for my building foundation as well

Solution 3:

Build a underground storage unit made of concrete and keep the bottom open as there's a chance for water to drain and water remains transport it out with moving tanker truck.

Pros:

• Seems quite simple to do

Cons:

• It could become expensive as I have to build structure with concrete

• This also might weaken the foundation

Solution 4:

Recycle the water and use it for toilet flush

Pros:

My water dependency reduces and it's environment friendly

Cons:

• It's expensive and might be hard to get some kind of certification from the government.

• Not really sure about the smell and microorganism

My Opinion:

I'm not really happy with solutions given by local professionals as they're dishing out suggestion based on their hunch rather than some technical analysis. I find their suggestion could become unreliable.

I'm looking for a solution which will not cause any damage to my building foundation and will be in reasonable cost.

P.S

• I read the below news and it really got me worried. https://www.thenewsminute.com/article/why-buildings-are-collapsing-house-cards-bengaluru-156578

Update

---

Please find my soil texture below

Reference for soil texture: https://www.yumpu.com/en/document/read/6730715/cauvery-delta-zone-status-paper-tnau

Answer 1

You have done the research. You want hard calculations on water? You will never get them. Water is fluid, always changing. A concrete answer to the paths and contents of water does not exist.

If you want this problem solved, you have only one choice: Buy the lot next door. Investment is risky and you will have to maintain more. When I sit and consider everything, none of the other solutions, although sensible in their own way, are actually reasonable unless you have more space.

My daughter purchased a home in an area whose ground is much like yours. High clay content where water sits around just about everywhere. High salt water level (near lake Erie), so you can forget about a well. The solution enacted in that area is simple: Nobody is allowed to own property smaller than two acres. Some things just cannot be done on a postage stamp.

Answer 2

Try flow-well Drywall or try something like this. It should do.

So its basically a container with some slots so that water can be discharged at all the levels of sand. It's better and can contain more water than soak pit.

Reference:

https://www.ndspro.com/flo-well-kit.html