I forgot to give you the working formulas, Cecil.
Where L = the length of the pond, W = width, and D = depth (all measurements in feet)
For a 1:1 slope: (L - D)x(W - D)xD divided by 27 = volume in cu yds to be removed.
For a 2:1 slope: (L - 2D)x(W - 2D)xD divided by 27 = cu yds to be removed.
For a 1.5:1 slope: (L - 1.5D)x(W - 1.5D)xD divided by 27 = cu yds to be removed.
For a 3:1 slope: (L - 3D)x(W - 3D)xD divided by 27 = cu yds to be removed.
I'm sure you get the picture. Now ain't that simpler than all that other stuff?
Best regards.