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Message: [QUOTE="Lisak1, post: 272385, member: 6145"] Sure! We have a negative edge pond that flows into a "reverse bog". The pit itself is 6 feet deep (and I think 10x10 if memory serves) and is filled with Aquablox - the purpose is to create space that can hold more water than a pit filled with gravel or rock. The top 12" or so is gravel. The portion that's visible is actually only about 4ft x4ft - the rest is covered with dirt and you would never know that directly beneath you is 1000 gallons of water. This also serves as our skimmer, so larger debris is caught at the top of the gravel as the water flows through. We rake it out or pick it up by hand, depending on what it is. Our submersible pump is in a vault that sits in the pit. So the water flows over the edge of the pond, through the gravel, into the rain exchange where the pump lives and gets pumped back up to the up flow bog where it feeds the main waterfall. And since a picture is worth a thousand words, I probably should have lead with this: [ATTACH=full]81989[/ATTACH] This photo is oddly elongated, but you get the idea. You are looking straight at the end of the pond. The gravel you see is the "reverse bog". We grow plants directly in the gravel - those are hostas on the right that were scrawny little pieces leftover from some transplants so I thought "what the heck - I'll try them here". They have grown like crazy. To the left, under the gray pot (behind the blue one) you can just make out the vault lid. So the pit extends that far to the left and then beyond the stone wall on the right almost to the grass you can just barely see. And that's all full of water - most of the time. When we have a dry spell, we sometimes have to add water, but generally the water that we store gets us through without having to add a lot of water. We plumbed our sump pump to empty into the pit as well, so we capture as much rain water as we can. We also installed an overflow pipe that drains to the storm sewer - that's come in handy a few times when we got so much rainwater the rain exchange was full to the top. We regret not making the storage area bigger. But that would have meant deeper, which would have been an engineering concern. We were advised by a contractor friend not to go more than six feet without shoring up the hole. You can see the bog at the top right of the photo with my two (friendly) herons standing guard. [/QUOTE]

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