The outlet end of the supply pipe to a gravity tank shall be at least six (6) inches above the maximum water line of the tank, and the supply pipe to a pressure tank shall be so arranged as to prevent the water in the tank from flowing back into the main in the street. Each tank shall have a suitable check valve in the pipe leading from it to the distribution pipes of the fire system for the purpose of preventing the flowing of the water from the fire system pipes into the tank.
(Ord. No. 99566. Passed 5-22-33)