Using PileV enter the linear piles placed by two trippers 50 feet apart. Enter the 3 drawholes evenly spaced at 37.5 feet. Enter two imaginary walls centered between drawholes and get the results shown for the 7 interior bays. A similar calculation can be made for the two end bays. 

The entire building can also be done in one calculation without the benefit of the individual mill line volumes.

Hand calculation method: Draw 50 (or fewer for less accuracy) horizontal sections at regular intervals through the storage pile. Use a planimeter to get the area of each section. Make the approximate volume calculations. Plan on about 2 man-hours per section.