The one fact i never found was a basic height of how much the liner should come up higher then the height of the waters surface. well i would now say i would not build again without having a 6 inch high edge all the way around to contain the water. the reason for this would be dead plant mater can actually act like a straw and wick the water up and over low sides. i have found even rubber folds wicking water up over a low edge. Now that doesn't mean all the edges have to be a 6 inch vertical wall it can be like a beach and the height is obtained over a foot or more .Overlap the bog liner over the pond liner as deep into the pond as possible and as wide as possible, then form a low point in both liners at middle for the water to flow over.
Later you can experiment a bit to make it look natural by adding flat rocks. Or stack the rocks along the divide creating a rock wall. The pea gravel in your bog can help support the rocks. You could have the water flow over or under the rocks. Just make sure the pea gravel doesn't wash out into the pond. You can set rocks near the low spot in the gravel to prevent this.
Some members have used a bead of PL roofing cement between the liners for a seal. I don't think it's absolutely necessary, but probably a good idea.
Hopefully they will chime in to verify the exact product name.
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