ENST 320a Lecture 1: ENST 320a Midterm 2 Study Guide
8 Feb 2017
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Document Summary
Lecture 5: water dynamics of surface and subsurface waters. Rivers, lakes, reservoirs-linked to ground and surface water. Gw/sw removal has variety of effects: decreased stream flow and lake levels, decreased water quality, increased levels of toxics. Urbanization, agriculture, and sewage treatment also factors. Usgs diagram: as population increases, consumption increases, population continues to increase. Groundwater and surface water really aren"t increasing very much. Surface water: unequal distribution, seasonal variability. Ground water: lots available, but slow renewal rate. Can measure hydraulic conductivity and infiltration rates to determine renewal rate: depleted rapidly. 78% of gw withdrawals due to irrigation, livestock, aquaculture, industrial, mining, and thermoelectric. Only 22% used for public supply and domestic. Major water source for agricultural, municipal and industrial development. 9(cid:882)% of aquifer irrigates (cid:883)/3 of nation"s crops. Drinking water for more than 2 million people. Depletion: withdrawal>recharge, 250 year water supply in nebraska, 25 years for kansas.
