ENVT 0845 Chapter Notes - Chapter 12: Water Treatment, Decomposer, River Engineering
15 Mar 2016
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Chapter 12 (i) streams (ii) lakes and ponds (iii) groundwater (iv) wetlands (v) estuaries (vi) oceans: strategies for conserving water, water treatment, water conservation policy and law. Over 70% of earth"s surface is covered with water. Equal amount of water evaporates as precipitates: precipitation has three fates. Flow over land: rivers, streams, percolate to groundwater. Area of land that drains to form a river or lake. Separated by geological features: mountains, plateaus. Use over half of water flowing in earth"s streams. Nonconsumptive uses: water use that returns to streams/aquifers. 12. 2 streams: human use and impact, dams and diversions, reduce water flow and disrupt system, channelization and artificial levees, reduces flooding, speeds water flow, pollution. Point-source: from a specific location such as pipe/factories. Non-point-source: from a variety of sources across a landscape. 12. 3 lakes and ponds: human use and impact, altered quantity of water. 12. 5 wetlands: human uses and impacts more than half of world"s wetlands altered.
