waterres - Lecture 11 Water quantity less than 1% of water...

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Unformatted text preview: Lecture 11 Water quantity less than 1% of water on planet is available freshwater Water quality the quality is as important as the amount The Hydrologic Cycle: Fundamental Component of the Water Supply and Use System Available Water Determined by: Precipitation Evapotranspiration = Runoff (available water) Key Limitations Spatial variability large water balances dont always coincide with high use areas e.g. Siberia high runoff, low use American Southwest/Southern California- low runoff, high use Water Withdrawals by Basin Pre-Bust Growth Trends in the Dry West Growth of Las Vegas (Nevada), 1984-2009 Key Limitations Temporal variability seasonal demand often coincides with low water availability Summer: high demand: agricultural, lawns low availability: temperature and natural vegetation use is already high, increasing evapotranspiration, summer droughts Also, precipitation varies from year to year New Brunswick Climograph The Freshwater Delivery System We use mix of technology and natural processes to overcome limitations Interbasin (Interwatershed) Transfer Reservoirs in the Water-Supply System A Colorado River Reservoir, 2004 NYC water supply is drawn from 19 reservoirs, plus the Delaware River through 6,000 miles of pipe connections. Over 90% of supply comes form Catskill/ Delaware sources. NYC does not (yet) filter its water . Groundwater zone (zone of saturation) Sinkhole from Excessive Groundwater Withdrawal Saline Intrusion Withdrawal removal from surface or ground storage for use, may be returned to storage Consumptive use water withdrawn does not get returned to source In-stream use use of water in lakes, rivers, streams...
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waterres - Lecture 11 Water quantity less than 1% of water...

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