LECTURE 3: WATER HAZARDS AND HUMAN HEALTH

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Water covers 71% of earth surface but not all the water is available for our consumption. Sculpturing the earth"s surface: water change the shape of the planet earth i. e. water erosion. Flushing toilets (30%), showering (35%), cleaning (5%), laundry (20%), drinking (10%) Canada has plenty of water available for us. But some countries don"t have water for basic purposes. One out of six people do not have regular access to clean water. People are walking miles to get some clean water. Diarrheal deaths kill over 2 million children annually. Annual reports on local drinking water quality. Naturally pure water & distillate water: never purely 100% - we need some minerals in water. Water we drink is coming from the lake ontario from deep inside reservoir. Surface water - in urban areas mostly from rivers, lakes and reservoirs. Groundwater: naturally filtered: soil has different chemicals which purifies water, less organic matter, often does not need any treatment.

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