(1) If a standpipe and hose system is required, the water supply shall be sufficient to provide a flow, measured at each of the two hydraulically most remote 38 mm diam hose connections,
(a) of not less than 380 L/min,
(b) for not less than 30 min,
(c) at a pressure of not less than 450 kPa, and
(d) of not less than 190 L/min from each of the two outlets simultaneously.