What is the preferred method for anchoring the edges of the line

Most common by far is the "anchor trench", typically around 1 foot wide by 1 foot deep, or larger if desired. The most common variation on the anchor trench is the "anchor shelf or bench". Rather than going down into the ground, the shelf is just a flat horizontal (or slightly canted back) area about 4 feet wide that the liner is laid onto, then buried. This method seems to get more popular as the size of the pond gets bigger. It also tends to be a little more "forgiving" when attempting to get grass to grow right down to the waters edge. Either method is perfectly acceptable and commonly used. More detailed drawings are available on request.

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