a prolonged period in which precipitation is at least 70% lower and evaporation is higher then normal
water that contains very low levels of dissolved salts
precipitation that infiltrates the ground and percolates downward through spaces in soil, gravel, and rock until an impenetrable layer of rock or clay stops it
zone where all available pores in soil and rock in the earth's crust are filled by water
upper surface of the zone of saturation in which all available pores in the soil and rock in the earth's crust are filled with water
underground caverns and porous layers of sand, gravel, or rock through which groundwater flows
the freshwater from rain and melted snow that flows across the earth's land surface and into lakes, wetlands, streams, rivers, estuaries and the oceans
precipitation that does not infiltrate the ground or return to the atmosphere by evaporation
the land from which surface runoff drains into a particular stream, lake, wetland, or other bodies of water
surface runoff water that generally can be counted on as a stable source of water from year to year
the freshwater that is not directly consumed but is used to produce food and other products
a rough measure of the volume of freshwater that we use directly and indirectly to stay alive and to support our live styles
structure built across a river to control its flow
artificial lake
process of removing dissolved salts from ocean water or from brackish water in aquifers or lakes
what is the name of the adjacent area that freshwater streams spill into when it overflows its normal channel
when aquifers replenish naturally by precipitation that percolate downward through exposed soil and rock
when aquifers are recharged by the side
aquifers that get very little, if any recharge
scientists who study water and its movements above, on and below the earths surface
competition for scarce freshwater to support growing urban areas, irrigation recreation and wildlife
a measure based on comparison of the amount of freshwater avaliable with the amount used by humans
what is it called when an aquifer sinks
what causes extreme sudden subsidence
the wetland area at the mouth of a river containing a rivers estuary
what is the most efficent way to deliver small amounts of water precisely to crops
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