CAS GE 100 Lecture 18: Ch 18-Water Resources
14 May 2016
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Document Summary
2. 5% is freshwater, while 2/3 of that is trapped in ice and snow: get water through evaporation and precipitation (how freshwater is returned to the planet) Ground water reservoir occurs when water reaches impermeable area and creates an aquifer: water table is above the aquifer. Vegetation affects evaporation rates: in brazil, deforestation causes less rainfall in southern country. Watershed area of land where all water that is under it or drains off of it goes into the same place. Continental divide is the series of ridges through the rocky mountains that divides the country into 2 drainages. Mississippi basin is critical for agriculture production and exports. Charles river is 80 mi and it"s the most densely populated watershed in new. England: 8,000 acres of wetlands in the watershed are protected forever from development, has 20 dams (fish ladders for migratory fish)
