Length = 13 meters Diameter = 1.5 meters Capacity = 70 % Water density = <span> 62.4 lb/ft3. </span> Equation: <span>((3.14(39.375/12)**2)x13x39.375/12) x .60 x 62.4 = X </span> Where X will be the load in pounds. You just have to use your calculator to calculate the value of x given the equation.