Tanker (Water Shuttle) Flow Capability
Sustained rural shuttle flow: usable = nominal x fraction (ISO ~0.90); shuttle_flow = usable x tankers / cycle (fill + dump + round-trip). The fleet flow is capped by the slowest link -- usually the fill or dump site, not the tank size -- so a fourth tanker adds nothing if the fill pump cannot turn it around. A planning aid, not incident command.
Formula and source
usable_gal = nominal_tank_gal x usable_fraction; shuttle_flow = usable_gal x tanker_count / cycle_time_min (cycle = fill + dump + 2 x travel).
ISO PPC hauled-water credit / NFPA 1142 water shuttle, by name.
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