Water-Supply Duration
Sustainable duration of an available water volume at a selected flow, with the net drawdown time and steady-state sustainable flow when a continuous resupply rate is entered.
Formula and source
t = V / GPM; with continuous resupply R: if R >= GPM the supply is effectively sustained (report sustainable flow = R); else t = V / (GPM - R).
Volume/flow continuity (first principles); required-duration context per NFPA 1142 (rural/suburban water supply), by name.
Audience
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