Lecture Oct 12th

Lecture Oct 12th - WorldWaterCrisis Thepresentchallenge

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1 World Water Crisis ENVR 200 The present challenge •G loba l hydrological cycle provides renewable freshwater through precipitation –No t evenly distributed in time or space – >50% of runoff occurs as floodwater (uncaptured) – 19% of runoff is geographically remote – 31% is accessible (54% of AR is appropriated) •2 billion people experience water shortages in over 40 countries •1 .1 billion do not have drinking water •2 .4 billion have no sanitation provisions World Water Crisis •How to deal with water scarcity •Scarc ity and food security trade •G loba l Water Footprints & other scary maps Source: UNESCO/WMO/WWAP Report (2004) “A look at the worlds freshwater resources” Fresh Water Scarcity Can we increase the ‘accessible’ fresh water supply? fresh water supply? Is it possible to increase the capture of flood water? Capturing Runoff - increasing geographically and temporally
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2 ADVANTAGES • Reduce high flows • reduction or elimination of floods Increase in low flows Capturing runoff (Dams) • Increase in low flows • Water available when it is not normally
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Lecture Oct 12th - WorldWaterCrisis Thepresentchallenge

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