Multiple uses of water
Content Table
Definitions
Water use refers to water that is being put to beneficial use by humans. Detailed water accounting, however, requires more precise definition of terms.
Water withdrawal is the gross amount of water extracted from any source in the natural environment for human purposes. Differentiating withdrawals by type of source is useful to understand the pressure put on different parts of the system.
Water demand is the volume of water needed for a given activity. If supply is unconstrained, water demand is equal to water withdrawal.
Water consumption or consumptive use refers to that part of water withdrawn that is evaporated, transpired, incorporated into products or crops, consumed by humans or livestock, or otherwise removed from the immediate water environment. Water consumption is high in agriculture, where water is consumed by evapotranspiration of crops, and typically low in other sectors (domestic industries).
The return flow may be restored to the water system either as groundwater infiltrated through permeable soils or directly drained into rivers or other freshwater bodies.
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