11:375:101 Lecture 12: Intro to Enviro Class 12 Notes
31 Oct 2018
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Surface water - an area of land that water flows across, through, or under on its way to a stream, river, lake, ocean, or other body of water. Freshwater is less than 1% of earth"s total water. 79% of water is tied up to glaciers, ice, caps. 1 bathtub = 40 gallons of water. (cid:1152) of surface runoff is lost due to flooding, so we rely on (cid:1151) of surface runoff. 70% of surface runoff use by agriculture. Domestic use of water averages to 100 gallons/person/day. Too many people use too much water. Building dams and reservoirs that capture more runoff. Provide benefits but can create problems as well. Three gorges dam in china is the largest dam in the world. More money spent to build sewage treatment plants. Aquifers are porous sponge like formations of rock, sand, or gravel that hold groundwater. Water bearing, porous rocks trapped between layers of less permeable substrate like clay.
