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Sealing leaking cracks / macropores in soil around a pond outlet structure

Sealing leaking cracks / macropores in soil around a pond outlet structure

(OP)
Working with someone who has a small agricultural pond that experiences water leakage around where the vertical walls of the concrete outlet structure meet the earthen / grass side slopes of the pond. When the pond is drained, you can see small crevices / cracks / holes / macropores along and around this edge…there is also some woody vegetation that tries to grow here. They control and remove the woody vegetation but it has probably opened up some drainage paths via root action.

Based on various field investigations, we are quite confident we have identified the main locations of the leaking. (I can go into other possible leakage sources we’ve investigated and why we’ve ruled them out, if needed. The pond has a bentonite liner that appears to be functioning well) The pond leaks at up to 50 gallons per minute which is not acceptable in the long run. (there is no natural inflow into the pond, this is a small pond and so they have to replenish the lost water on a regular basis)

Now we are looking at remedial options. We are looking at options that involve a pretty intensive reconstruction or repair of the outlet structure, installing cutoff walls and other options. But given that we are pretty confident that the leaking area is limited in size (probably about 10 linear feet on either side of the outlet structure wall), the client would like to try a phased approach, and investigate lower cost alternatives for trying to plug these leaks from the surface, without extensive excavation.

So I’m looking for fixes that could be poured or injected to try to plug these leaks. The client is willing to consider these, even if it is a short term fix that lasts for a year or two while they budget to do a more extensive outlet repair. I’m looking at things like a bentonite slurry or injection, or urethanes and resins such as Prime Flex or Uretek, or other chemical grouts.

Any thoughts on approaches? I think some of these products are usually used to seal concrete cracks..not sure how they would work in a soil matrix. Also wondering what would be best right along the concrete / soil interface. The pond is drained at least once a year, so I’m worried about the seal cracking / pulling away from the concrete wall when it dries.

Thanks for any advice you have.

RE: Sealing leaking cracks / macropores in soil around a pond outlet structure

One simple way is to excavate as much of the backfill to the outlet structure as possible and them compact in a mix of local soil with bentonite (powdered). where there may be erosion that might occur, a graded filter will let water pass but will hold back the soil- bentonite mix. Ideally concrete sand usually works,but more coarse material (sand and gravel mix) beyond may be needed to old the sand. For sandy material about a 1 to 5 ratio of bentonite - soil (thoroughly mixed) works as a seal, but for finer soil less bentonite works also. Too much bentonite and a real mess results.

RE: Sealing leaking cracks / macropores in soil around a pond outlet structure

I had a problem like that one year ago, with verry small cracks leaking, they solve it and gave me 5 years warranty!

Injection process company in Florida.

RE: Sealing leaking cracks / macropores in soil around a pond outlet structure

We have done some permeation grouting with micro-fine grout that flows in cracks like water and sets up.This was to seal leaks around concrete pump structures on river dikes . This will work but its not a low cost process.

Intrusion Prepakt /marineconcrete.com

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