Help my waterfall leaks

Following, as I have the same issue. I only run the waterfalls for about 30 minutes at a time because so much water leaks out of the back of them and runs into the yard.
 
I'm surprised there haven't been any posts to this. Did you solve your problem?

I'm not an expert by any means, but I'm in the process of fixing a similar issue and the videos I've seen use an expanding foam meant for ponds and stones, so I bought this one.

Hope that helps.
 
Is there a product available to seal a natural waterfall ( rock and concrete) I want to seal it on the face of the waterfall to prevent water from soaking through the concrete.
This is a good product, though a bit pricey. Won't stop a plumbing leak, which is where most waterfalls leak.
Old saying in the pool business, "There are two types of waterfalls, those that leak and those that are going to leak." Hope yours proves this wrong.
 
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