With a 20 inch lift and all the soil you will have you can easily gain another 20 inches at least ten can be blended in with the hill side and another20 to raise the bog side walls having the water down 10 inches from that highest point and with only 20 inch lift on the side of a slope already it will not look like a volcano thats a 30 inch lift from your pond water level you can surely do a lot with thatThe waterfalls will be visible, they just aren't very tall. The effect maybe more of a sluice than of waterfall, but I don't know how the bog slows or affects the flow from the 4k gph pump.................. 4k is a little high to dump into the bottom of the bog but it is very low on the over all amount you should have in the pond.
I guess I don't see how a gravel filled chamber with water flowing over the top of it will give you any biofiltration. Once it fills with water, you won't get any water movement through the gravel. Am I imagining this correctly? And I'm also imagining realizing that gravel has gotten really gunky and stinky and having to deal with digging that out. Not to mention potentially toxic - much like what can happen if you have too much gravel in the bottom of a pond. Unless you have water up flowing from these chambers, ala wetland filter, I think I'd leave them just to fill with water.make A and B gravel filled to gain some sort of biofiltration.
The wall around the pond is a few inches short of 2 ft high, that is to keep out outside flood waters, which last year, reached knee high (I'm also installing drains and using other means to redirect the water, but not sure if they will be sufficient due to the rate of downpour). The outer 10 feet of the pond is only 2 ft high, so the pressure on the water isn't all that much I think. The middle region of the pond will be dug out an additional 4 ft, so 6 ft total, but that area I don't think contributes to pressure on the short walls.I forget your depth i think it was only 2 feet and you said the liner would not be against the concrete block if that is the case then why a 2 foot tall wall and i guess your digging in the pond completely into the ground?
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