Earth Sciences 1070A/B Lecture Notes - Lecture 9: Specific Storage, Aquifer, Travertine
18 Jan 2017
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Document Summary
50% people use ground water as drinking source. Subterranean caves: large volumes of rock dissolve. When it rains, some water is: absorbed into earth, carried above surface (runoff, evaporates. How much water absorbed by ground is determined by: amount/type of vegetation, nature of surface material, steepness of slope, rainfall intensity. Water table: predict productivity of wells, can account for water levels of lakes, depth measured from ground surface to top of water table. No rain (drought) water slowly drains away form hills to lower levels (valleys) bc distribution is uneven. 2 factors that affect rate of groundwater movement: porosity: % of total volume of void space. Ex. soil could have 10% void space and 90% sediment volume (openings betw sediments) Degree of sorting (well sorted = equal size grains, more space) Amount of cement (fills pores: permeability: measure of material (sediments, soil, etc) that can pass a fluid.
