BRICK CISTERNS Table XX will be found of service in determining the number of bricks required for the construction of cisterns.


To use Table XX, multiply the number of bricks in column corresponding to the diameter and thickness of wall desired, by the depth of the cistern; and add the number required for the top and bottom. The top should have a rise of about one-fifth the diameter.
To reduce the capacity of the cistern to barrels, divide contents in gallons by 31.5.