Question 1178403
Volume ={{{ L(R^2 *cos^-1((R-D)/R)-(R-D)*2RD*sqrt(2RD-D^2))}}}

where:
R  is the radius of the cylinder.=36 in
D  is the depth.=24 in
L   is the length of the cylinder 96in

Plug the values and get the answer
=299.58 gallons

now we know volume , diameter 
we can find height/depth