water that seeps into the ground and percolates downwards
spaces in soil and rock that are completely filled with water
top of the groundwater zone
geological layers deep down in the ground
freshwater from precipitation and melted snow that flows across the earth's land surface
precipitation that does not infiltrate the ground or return to the atmosphere by evaporation
the land from which surface water drains into
one-third of the annual surface runoff that we can generally count on as a source of freshwater from year to year
a prolonged period in which precipitation is at least 70% lower than average and evaporation is higher than normal
a rough measure of the volume of water that we use directly and indirectly to keep ourselves alive
removing dissolved salts from ocean water or from brackish water in aquifers or lakes
an area that water in a stream overflows and spills into
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