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Lecture 3

EESC03H3 Lecture Notes - Lecture 3: Distilled Water, Turbidity, Tap Water


Department
Environmental Science
Course Code
EESC03H3
Professor
stephonvic
Lecture
3

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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

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- 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
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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.
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