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Quantitative Precipitation Forecast (QPF) — A forecast of the amount of precipitation which will fall during a specific time period. These precipitation amount forecast values can then be used as inputs to hydrologic models for river forecasting purposes.

Quarter-Flow Interval — The shortest period of time in days (typically) during which one-quarter of the annual runoff occurs.

Quench Tank — A water-filled tank used to cool incinerator residues or hot materials during industrial processing.

Quicklime — Another term for lime, or calcium oxide (CaO), used in many water and wastewater treatment operations such as softening, coagulation, and phosphorus removal.

Quicksand —
(1) Sand that is unstable due to the upward pressure of water.
(2) Sand easily moved or readily yielding to pressure, especially a deep mass of loose sand mixed with water, very dangerous from the difficulty of extricating anything that begins sinking into it.