Chapter 8 powerpoint - + Water Resources and Water Miguel...

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Click to edit Master subtitle style 8/9/11 + Water Resources and Water Miguel Iglesias Ricardo Nesrala Thiara Fernández
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8/9/11 + Freshwater: An Irreplaceable Resource n Water is one of our most poorly managed resources. n We are using available freshwater unsustainably and wasting it, polluting it, and charging too little for this irreplaceable natural resource. n The earth is 70% water but only about 0.024% is readily available to us. One of every six people do not have sufficient access to clean water, and this situation will almost certainly get worse. n Fortunately, the world’s freshwater supply is continually collected, purified, recycled, and distributed in the earth’s hydrologic cycle.
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8/9/11 +
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8/9/11 + We get freshwater from Groundwater and Surface n Below a certain depth in the zone of saturation , these spaces are filled with water. n The top of the ground water zone is called water table. n Deeper down there are aquifers: underground sources of water. n As for surface water, the water that doesn’t infiltrate the ground is called surface runoff. n A watershed or drainage basin is the land from which surface water drains into any body of water.
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8/9/11 + Runoff of Surface Water n Two-thirds of the annual surface runoff in rivers and streams is lost by seasonal floods and is not available for human use. n The remaining one-third is reliable runoff. n We use 54% of the world’s reliable runoff water and more than half of the world’s reliable runoff of surface water is mostly used for irrigation.
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8/9/11 + Water Shortages Will Grow n Droughts contribute to water scarcity. n Also, in some places where water is scarce, there are too many people drawing on the reliable water supply, and often there are not enough funds available for drilling wells or building dams, storage reservoirs, or water distribution systems. n
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Chapter 8 powerpoint - + Water Resources and Water Miguel...

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