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Pond Size And Depth. by Tom Burton. Once the where is decided, we need to determine size and depth. An ideal pond for the average hobbyist is between 23 and 25 feet long by 12 to 13 feet wide and 3 to 4 feet deep.
Then add another 2 feet. For the liner width measure the maximum width of the pond, add twice the depth, and then add another 2 feet. You didn't indicate the pond depth you are considering. I suggest you think in terms of 2 feet on average, with a 4-foot deep section and a 1-foot shallow area.