Pond "Water Bubble" Fix

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Update: May 2019

Firstly, the solution to the fraying fabric edges is a hot knife. Dremel has a butane solder tool with a hot knife tip that works great.

Secondly and most importantly is the system function. This system has functioned as designed with no modifications since this was filmed. We have NOT ONCE pumped out the sump tube. We've experienced plenty of downpours, hurricanes, snow, and ice; including times when the water level was spilling over the edge. The shape of the "bowl" has not softened or settled; prior this modification the shape of the original excavation was not retained.

What would I improve? Some of the edges have slumped as predicted. Mainly along areas with the steep drop off. The areas with a plant shelf and shallow "beach" slope were not as problematic. The amount of boulders we have were budget limited, so a generously sized shelf that can hold a second row of boulders that sit in the water (leaning against the edge) is one solution.

Rather, we will reshape the excavation for an underwater shelf along the full perimeter (wider where a plant shelf is desired); using the same amount of stones we will set them on the newly dug/shaped shelf, so they're not resting upon the less stable gravel & pipe edging system; we will lay the liner edge flat and cover it with river gravel and fill it up to the back side of the boulders. This will be less accommodating for rework, but, with how reliable this has proven to be, we won't need to get back in there for anything and it will do the job of hiding the liner edge without the expense of more boulders.

We will surely post another video once we do all that I described.
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Fix to "water bubble" issue with in ground filtered ponds. Caused from the water level of the pond being lower than the surrounding grade. Any water from leaks, overrun, or rain water will seep under the liner. This water is sandwiched between the liner and ground creating a thin column of water. This small amount of water has a higher water level relative to the pond with help of the sandwiching, so it also has greater hydrostatic pressure. If this water is not sumped out from beneath the liner, then it will make room for itself by lifting the liner up out of the way; causing a "bubble" of water.

Instead of unearthing the skimmer to raise it along with the water level (looking unnatural IMO), we artificially lower the surrounding grade. This was done by installing corrugated-perforated drain pipe along the pond's edge with a grade for drainage. This rests in a landscape fabric along with gravel laid on top. The gravel allows water to permeate to the pipe, the pipe allows flow, and the liner prevents soiling of the gravel.

Unfortunately for you I did not film the process. However it's a simple concept and may be applied to many drainage applications. We are looking forward to years of enjoyment with reduced maintenance. Additionally, the earth forming of the pond should be preserved longer without the constant wet environment; ours originally had ledges which melted away as the earth turned to muck and what you see now was freshly cut in while the pond was drained with the liner rolled back.