This is a working fish pond, with five tier waterfall. Will keep waterfall, and small recovery pool, but want to fill in the majority of pool, which is kidney shaped, 29 to 30 feet wide by 8 feet at widest point, and 7 feet near tips. All depth very close to 4 feet. I need this stable, what is the best filler to use? How to find this answer? There must be a formula to determine the contents of a pool. Just been away from school and math too many years.Thanks.
I would use soil, clay even. To figure out how much, multiply width x length x depth to get cubic feet. If you need to, convert that to cubic yards, divide by 27.
To figure out how many gallons of water in your pond again get the cubic feet and then multiply times 7.5 as there are 7.5 gallons of water in one cubic foot.