[Edit] 
Answer
Try taking a sheet of plastic wrap around the edges on the inside suface. Maybe the suction from the leak will grab the sheet?
Or try this: Throw in something of neutral buoyancy and see where it gets sucked to.
First answer by Knighttrain. Last edit by Truc. Contributor trust: 89 [recommend contributor]. Question popularity: 36 [recommend question]
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How do you find a leak in the liner of a pond?
