[Bill Schwab]

Matt:

I have thought about what you describe you are trying to do here....If I am understanding this correctly, you have a ledge of stone, naturally formed in your back yard, and since you are in PA it's probably that awesome pretty blue stuff that looks great with ponds, right?

And you want to funnel water over that ledge to use it's natural appearance and blend that in with your pond, is this correct?

If this is the case, we have used two options. The first, is you can use your cut off saw, and make a slight score into the face of this stone the width of how you want the fall to be. Then, carefully take a chisel, and gouge out a section that is about 1"-
1 1/2" lower than the rest of the stone so the water can funnel through. The other way, and this works great too, is to use rocks of the same coloring to build up the sides.Acid clean the surfaces, then stick it to the ledge stone. When it is dry, use Thero-Seal and make a slurry out of it. You can color this product so long as you use no more than 1lb of coloring per 50 lb bag of Thero Seal. After th water begins pouring over the chute, it will blend in and look natural. We use this ingerdient to plaster and waterproof swimming pools, and it has been on the market for almost 100 years. The problem I am seeing here is how you will install the rubber liner in the main pond below the falls. Unless there is a ledge where the falls will drop over the back of the lower pond, it is going to be pretty hard to keep the water from going under the liner. One way is perhaps to score the stone below, tuck the rubber in, and use epoxy, or even Great Stuff Foam to hold it in. Pictures would be great, and maybe this reply is all for nil...

Hope this helps!