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CISTERN—How to Build. 3
Cisterns, How to Build Square or Bound—The Difference in Capacity with, the Same Number of Brick. —But few persons are aware that a square cistern holds considerably less than a round one, the walls containing the same number of brick. But it is a fact, nevertheless. For instance: about 3, 800, or at most, 3, 000, brick will make a cistern 10 feet square and 10 feet deep, having an inside surface of 400 square feet, and will contain 1, 000 square or cubic feet of water, equal to about 7, 500 gallons, while the same number of brick will make a round cistern of about 123/4 feet in diameter and 10 feet deep, which will contain about 1, 270 cubic feet, or 9, 225 gallons, a gain of about 27 per cent, in capacity, with no more cost, either in brick, mortar, or laying the walls. Calculate about 7 brick to lay a 4-inch wall, for each square foot of wall desired, whether larger or smaller, deeper or less depth, it matters not. For the size above given, about 3 barrels of cement will be required, as the bottom ought to be about 3 inches thick. In laying the wall great care should be taken to ram or pack the dirt down very firmly behind it, so as to resist the pressure of water. The roof should be arched 3 feet below the top of the ground.
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