Excavation Dewatering Pump Rate
Pump rate to draw an open excavation down in a target time and hold it against a steady inflow, with a safety-margined selection rate. Defers head to pump-tdh.
Formula and source
drawdown_gal = pit_len x pit_wid x drawdown x 7.48052; pump_gpm = drawdown_gal / drawdown_min + inflow; sized_gpm = pump_gpm x (1 + safety/100).
First-principles volume and pumping-rate arithmetic by name; defers total dynamic head to the pump-tdh tile.
Audience
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Posture
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