Brettski,
I use my own figures so buyers beware!
I do think they come out pretty close.
The distance of 1 slope equals the volume in 2 is how I figure it if slopes are the same.
Example 2 Slopes facing each other like the sides of a pond. 10 feet long 10 feet deep 3:1 each side, no bottom width. 10 long x 10 deep x 30 (distance of one slope) =3000 sq ft / 27 (to get to cubic yards) = 111.11 cu yds.
You would half this number to get the yardage of one slope.
On Derecks pond of an acre the distance if square would be 209 by 209 feet.
Figureing 12 feet deep I would subtract the distance of 1 slope (36 ft.)for east west distance and subtract 1 slope (36 ft.)for north south distance. This subtracts volume for all 4 slopes.
Then I figure the volume of a square hole 173 ft by 173 ft. 12 ft. deep.
173 x 173 = 29929 x 12 = 359148 sq ft and divide by 27 = 13,301.77 cu yds.
Guess I could of just said, No I didn't get it from there, and saved everyone some time.
