Some of the boats I have need to be tested in water and they are too large to fit in a bathtub, so I decided to build a temporary test tank in my garage, behind a stored car.
Bought a couple of 8' construction grade 2'X8's and had them cut into 6' & 2' pieces. screwed them together at the 4 corners (see detail photo) creating a 72"X18" tank area. also bought a 2mil 9'X12' plastic drop cloth which when cut in half yields 2 double thick 9'X3' liners. Placed the plastic in the frame and slowly filled it with water. As it was filling I stapled the liner around the top edge of the wood frame, and voila I had a tank the was about 5-6" deep!
The whole deal cost less than $20 to build.
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Don't ask! 