Lec 3 Water Resources_ASR.pptx

Lec 3 Water Resources_ASR.pptx - Lecture-3:Water Resources...

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Lecture-3:Water Resources Course Instructor: Md Asif Rahman (ASR) Lecturer, Department of Mathematics and Natural Sciences (MNS) University Building 2 (15 th Floor) E-mail:
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We already know that water covers about three- quarters of the Earth’s surface, and It is essential to life (plants, animals, humans) Water is a renewable resource- that is after it has been used it returns to the water cycle and in time it will be used again. The total abundance of water on Earth might not seem to be a problem. But people rely heavily on fresh water and its amount is limited ( 3.5%) in comparison to the rising world population and increasing demand. Making water available where and when it is needed is a problem.
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Oceans and seas - 96.5 % of water Fresh water – 3.5 % of water Fresh water distribution: Ice: 1.762% Groundwater: 1.7% Surface Fresh Water: 0.014% Atmosphere and Soil: 0.002%
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Water is used in many different ways, including: Domestic use : for showering, washing clothes, watering lawns and gardens etc.
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