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26 inches across the top. Not sure on depth probably 20 inches
About 3 inches
I suppose you could bury it but I think after time it might corrode!
If you are only pushing the 20 gallons or water, an 80 GPH pump would be fine.
depth for this is front to back, think of it like you put it on the ground in front of a wall, from the measurement from the wall to the front is the depth, side to side (parallel to wall) across the top is width and ground to top is height.