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18-29-604.10.1.2  Size of piping.
   The size of piping shall be such that the velocity of each flow during maximum demand will not exceed 8 feet (2440 mm) per second velocity in the main supply pipe, principal supply pipe, and branch supply pipe. When a water service requires a pump, the velocity of flow in the service shall not exceed 5 feet (1525 mm) per second velocity.