ENV200 Chap 9 Notes (Aquatic Resources, Uses and Management )

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School of Environment
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Karen Ing

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ENV200 Chapter 9Aquatic Resources Uses and Management1y Water is constantly recycling through hydrologic cycle from ocean to atmosphereand to land and back to ocean through precipitationthrough process of evaporationy Transpiration also contributes to cycle as plants take up water from roots in soil and release it into atmosphere through pores on undersides of their leaves during photosynthesisSurface water y Precipitation that remains on surface of land and does not seep down through soil y Found in streams rivers lakes ponds reservoirs and wetlands area of land covered with water for at least part of the year y Drainage basins watershedsarea where all surface water drains into same river lake or oceanRunoff y Movement of fresh water from precipitation and snowmelt to rivers lakes wetlands and ocean y Replenishes surface watersGroundwater y Supply of fresh water under earths surface that is stored in underground aquifersy Originated as surface precipitation that slowly seeped into tiny spaces in ground between loose sand gravel and between bedrock cracks y Collects in large reservoirs called aquifers Aquifers y Underground reservoirs of permeable rock from which groundwater can be extracted y Maintained through recharge zones y Unconfinedo Groundwater seeps from surface through an unsaturated zone until it reaches water table o Ground is saturated at this point and groundwater collects in reservoirs y Confined o Sandwiched between 2 impermeable layers of rock that restrict groundwater movement and force this water to be under high pressureone end has a positive electrical charge and other has a y Water molecules are polarnegative charge y Hydrogen bondNegative oxygen end of one water molecule is attracted to positive hydrogen end of another water moleculey Water is lighter when it is in form of ice and able to float on more dense liquid form below can dissolve many materials y Water is a solventy Todays floods are more disastrous than past because humans often remove water absorbing plant cover from soil and construct buildings on flood plains area bordering a river channel that has potential to flood
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