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Good point. I thought about that too....

When I originally figured my volume I used: 20x40 rectangle with an average 5' 8" (5.66') depth (3.2" shallow, 8.3" deep) to get around 33K.

Then, when we filled this year, I had 4 truck loads of water brought in. One truck supposedly held 5.9K, the other 5.8K. That's almost 24K total. Then I added over a foot with my hose which I calculate added another ~6,000+G. (20x40x1=800ft3=5,948G=~6K) 24K+6K=30K That put me at a revised 30K figure.

Do you think the corner bump-outs (see avatar) can account for that big of a difference? Am I doing something else incorrectly?