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EESC03H3 (1)
Lecture 3

Lecture 3 Water born Hazards.docx

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Environmental Science

Waterborne Hazards and Human Health Lecture 3 Liquid natural capitol - Rain, water, and other types of presicipitation sculture the planet o Ex: mountains, valleys, rivers, lakes sculpture the planet - Affects the climate: near seashore has milder climate o Milder climate areas closer to large areas of water - High concentrations of pollutants can affect our biological processes World’s problems  Withdrawal- total amount of water removed from a river, lake or aquifer for any purpose. -90% by 2025 - Quantity of water How much fresh water is available? - (look at diagram on lecture slide) - When someone wants to withdraw, should look at how much water is actually available - All water on earth: 97.4% is ocean and saline lakes. 2.6% is fresh water - Fresh water: 1.984$ is icecaps and glaciers.0.592% is groundwater. 0.014% is fresh readily available frsh water Stress on the world’s major river basins World’s problems - Some areas have lots of water but the largest rivers are far from agricultural and population centers - Lots of precipitation arrives during short period but cannot be collected and stored - Lakes and rivers shrinks - In dry areas, water should be collected, stored and used when in need later on How do we use the world’s fresh water? - Look to diagram - 3 countries - Different climates, diff. Level of development - Canada: 64% power plant cooling. 15% industry. 12% public. Agriculture 9% - 85% of water use for irrigation is consumed and not returned to water basin Average water use in Canadian homes (Environment Canada, 2005) - Look to diagram Hydrological poverty - Not relating to income of the people - Means: basically not enough water available - Contamination in this drinking water is not chemicals, it is microbes, bacteria, viruses - Water and Your health - Drinking water - Swimming water DRINKING WATER - Annual reports on local drinking water quality - Tap water & bottled water - Naturally pure water & distilled water - Natural content of minerals in water - Surface water - In urban areas o rivers o lakes o springs o cisterns - Ground water- In rural areas o wells - Canada has one of the safest drinking water in the world - Water without salts is called “distilled water” - Distilled water is not good because it does not have calcium and magnesium and our bodies need that - Surface usually used in urbanized areas - Groundwater is usually used in rural areas Quality of water - Water pH o Normal water ph: 7. o If higher than 7, could become a solid o If below, its acid - Hardness o The total amount of salts. Magnesium, and calcium o If we call water hard, means it has alot of salts o If its soft, there are not enough salts o Why not soft water? : soft water dissolves - Color o Should have no color o Transparent - Turbidity o If water is turbid, does not always mean water is toxic o Requires further investigation o We want transparent colorless water - Taste o Should not have taste - Odor o Should have no odor - Microbes and Chemicals Contaminants in Drinking Water 1.Microbes 2.Radionuclides 3.Inorganic Contaminants - Arsenic - Fluoride - Lead - Nitrates 4.Industrial Organic Contaminants - Pesticides and Herbicides - Volatile Organic Compounds (VOC) 5.Disinfection byproducts 1. Microbes - Fecal Coliform and E. coli bacteria – contamination with human and animal wastes, diarrhea, cramps, nausea, headaches, renal failure, coagulation disorders - Salmonella typhi – typhoid fever (hig
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