EESA10 Lecture 3.pdf

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Environmental Science
Silvija Stefanovic

EESA10 Lecture 3 Monday, May 27, 2013 12:10 PM Cue Column: Note-Taking Area: Waterborne Hazards & Human Health Liquid naturalcapitol • Water is everywhere (even in body,air) • Moderate climate - moderate peaks World's problems • Water ○ Quantity  In Canada,we have enoughwater □ But mostly used as a luxury  Some parts of USA don'thave enoughwater  Sometimes water has to be transported  Withdrawal: total amt of water removed from water source □ Can be returned to original source for reuse ○ Quality  Not much fresh water □ Check diagram (3 pie charts)  Stress □ Water stress: <1700 cubicmeters/year/person □ Water scarcity: <1000 cubic meters/year/person • Sometimes water far from agriculturalarea ○ Sources far from cities, rural areas • Precipitation in short period of time (but large amts of precipitation) • Withdrawal - lakes and rivers can shrink as a result How we use world's fresh water • Look at slide Hydrologicalpoverty • Countriesfighting over water sources • Not aboutlow income/money ○ Amountof water they have  Result: diarrheal disease/death Water & Your Health • Swimming • Drinking water ○ City is responsible for taking water samples  At their facility  Water can change  Hard water - more solids  Soft water - containsless ; uses more lead ○ pH, acidic in water  More lead dissolved in acidic water ○ Check image of land layers  Unconfined - opened to surface □ Not reliable source  Confined aquifer - water squeezed btwn layers under pressure □ Better in terms of pollutionb/c more difficultto contaminate Quality • Check slide image of sources of water contamination Contaminantsin drinkingwater • Microbes ○ Most famous  Coliform, E. coli, Salmonel
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