When it is necessary to reverse the flow in the system in Fig. P12.5, the pump is bypassed by a short section of pipe. The valves involved have negligible resistance when open. If the downward flow were not assisted by a pump, what would be the flow rate (in m³/s)?

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H Id₂ Reservoir 1 P trºt D 1d₂ Reservoir 2 Figure P12.5 Pumping from a lower reservoir to a higher one.