Refer to table: The formula for determining the size of thrust blocks needed to install water mains is: thrust per 100 PSI = required area of the thrust block. Bearing load of soil = per 100 PSI of water pressure.

Refer to table: The formula for determining the size of thrust blocks needed to install water mains is: thrust per 100 PSI = required area of the thrust block. Bearing load of soil = per 100 PSI of water pressure.