What is the formula for volume of a partial cylinder - my cylinder is horiz. w a 60'Dia 2'L and has 18'H full.?

Answer 1

v = lcos^-1 (1-(y/r))r^2+l sqrt[(2r-y)y](y-r)=pi (ry^2-(y^3/3))

where v=volume, y=height of liquid in tank, r=radius of tank, l=Length of tank

Or you can just use this:

http://grapevine.abe.msstate.edu/~fto/tools/vol/parthcylinder.html