327 IAC 8-3.2-11 Flow rate and pressure in the water main

Sec. 11. (a) The flow rate and the pressure requirements of subsection (b) shall be provided at all service connections in a water main extension applicable to this rule. (b) At a flow rate equal to the peak daily customer demand as determined in 327 IAC 8-3.3-2, the normal operating pressure in the water main shall not be less than twenty (20) pounds per square inch (psi) under all conditions of flow at the ground level at all points in the water main when demonstrated in conformance with subsection (c). (c) The flow rate and the pressure requirements of subsection (b) shall be demonstrated to the commissioner with either: (1) a computer-based model; or (2) other hydraulic calculations. (d) In addition to the requirements in subsections (a) through (c), the water supply and water distribution system at noncommunity public water systems shall be sized and constructed to deliver water at twenty (20) psi minimum pressure to all fixtures and appurtenances during periods of peak water demand.