sustainable water use
the use of water resources in a fashion that does not harm the essential functions of the hydrologic cycle or the ecosystems on which present and future humans depend
the removal of salt from ocean or brackish (somewhat salty) water
when salt water is heated until the water evaporates, leaving behind a crust of salt
most common type of membrane/filtration system, involves forcing salt water through a membrane permeable to water but not salt
microirrigation or drip/trickle irrigation
a type of irrigation that conserves water by piping it to crops through sealed systems
water that has already been used fir a relatively non-polluting purpose, such as showers, dishwashing, and laundry; not potable, but can be reused for toilets, plants, or car washing
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