Water resources

Water resources - Water Health Chapter 15 Click to edit...

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Click to edit Master subtitle style Chapter 15
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WATER 71% of earth covered with water Fresh water is less than 1% of the earth’s water 2% fresh water glaciers or ice 97% ocean water
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Where the Oceans Came From http://www.history.com/shows/how-the
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HYDROLOGIC CYCLE Atmospheric moisture Rain, snow, & sleet evaporate Water from lakes, oceans, soil & etc. evaporate Condensation occurs & then precipitation Rain falls through atmosphere & may bring pollutants with it (acid rain)
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PRECIPITATION Reaches earth and may become: Concerns: Water carries with it what it passes over Filtration occurs usually when water filters through soil, sand, rock layers
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Concerns Concerns: Transports diseases Transports chemicals
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Potable water Water of good taste, odor and microbiological quality Suitable to drink
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WATER QUALITY Water pH ALKALINE ACIDIC Water color - organics in water tannin iron copper Water turbidity
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QUALITY Sulfur Salts Other chemicals Nitrates: “Blue baby syndrome” Calcium Magnesium
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Surface Water Supplies Gathered in a cistern Concerns collection material Filtration before use Frequently used in developing countries Issue:
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Springs Gravity Artesian a geologic formation in which water is under sufficient hydrostatic pressure to be discharged to the surface without pumping. May use if: Good flow rate Not affected greatly by precipitation No surface/groundwater intrusion
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Groundwater Aquifer Layer of rock, gravel, saturated soil that water moves through Water table Level of water surface in the aquifer
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Water is Finite!!
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Ogallala Aquifer Being depleted—why?
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Edwards Aquifer Recharge Area http://www.edwardsaquifer.net/
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Water Use Toilet flush Large load of laundry Daily consumption of water by Americans Add industry, agriculture, utility
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How do we Limit Consumption? Agriculture Automated drip irrigation—cut loss from 60% to 5% Precision sprinklers—95% efficiency Buried droplines—100% efficiency Industry Water is not “used up”, rather is heated or polluted Recycling Households Rational water pricing Leak detection Water-saving plumbing
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Click to edit Master subtitle style Water Pollution
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What is Pollution? Anything in the water that is not water
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Sources of Water Natural: Volcanic ash Dust storms Trees Decomposing vegetation Soil Industry Physical: Heat
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Pollution Sources, cont Agriculture Sewage Chemicals: Pesticides Domestic Sewage Chemicals
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Water resources - Water Health Chapter 15 Click to edit...

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