I just bought a house that has a liner pool with a kidney type shape but the edges are all straight rather than rounded. Diagram attached. I have it figured at about 28000 gallons. The dotted line indicates a severe drop off from the 3 foot end about 1/3 of the pool to the deep end which goes as deep as 8 feet in a fairly small area. I used 7 feet for the average deep end. Drawing is very close to scale. Each square is a square foot. Thanks for any help you can provide.