Earth Sciences 1070A/B Lecture Notes - Lecture 9: Specific Storage, Surface Runoff, Aquifer
23 Nov 2016
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Document Summary
50% of the human population uses it as a source of drinking water. 85% of earth"s fresh (cid:449)ater suppl(cid:455) is (cid:272)o(cid:374)tai(cid:374)ed i(cid:374) gla(cid:272)iers. Earth"s i(cid:373)(cid:373)ediate su(cid:271)surfa(cid:272)e is (cid:374)ot (cid:272)o(cid:373)pletel(cid:455) solid. Pore spaces between particles and grains of sediment, soil and fractures or joints in bedrock all contain water. Acts as an erosional agent in the subsurface by dissolving soluble rock and moderating stream flow. Subterranean caves if large volumes of rock are dissolved (i. e. limestone) Most of the water discharged to streams is not from snow melt runoff, but from groundwater seepage that feeds streams. Used to predict the productivity of wells. Can control the variable and seasonal flow of streams in rivers, and can account for fluctuation in the water levels (heights) of lakes. Mapping the water table depth in an area is done by measuring the depth of water in dug or drilled water wells.
