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Published byAshley Carpenter Modified over 9 years ago
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Water Supply & Management Obj: Discuss the nature, importance and sources of water.
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Water Composition Water is made from hydrogen and oxygen Water chemistry: The study of the composition of water Water found in nature is not pure Water can be made pure by distillation Boiling water Collecting its steam vapor Allowing it to cool
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Physical State of Water Solid: Ice forms when water freezes at 32 degrees F Liquid: Water Gas or water vapor: steam; forms when water boils
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Water Salinity Saline water: Water that contains salt Water is classified into 3 categories based on salt content Freshwater Little or no salt Salt < 3ppt (parts per thousand) 3% of earth’s water Brackish Water Mix of fresh water and salt water Estuaries Salt Water Salt content > 16.5ppt 97% of earth’s water Desalination: process of removing salt from water
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Importance of Water Water supports life processes Needed for functions of life Human body=65% Too dry? Use irrigation! Water for daily living People in North America use more water than other countries Average person in USA uses 100 gallons of water each day! Climate is influenced by water since water moderates the earth’s temperature Water is used in manufacturing Processing food, refining oil, making steel, producing paper Water is used in recreation Swimming, boating, fishing, skiing, rafting, canoeing, hunting water animals Water is used in transportation
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Sources of Water Surface Water Water from lakes, streams, reservoirs, and oceans Water found on earth’s surface Watershed: an area of land from which all of the water that does not infiltrate the soil runs to a downhill location Ground Water Water from within the earth Found in aquifers; may be porous, sand, gravel, or limestone that hold water Must be managed & conserved The Ogallala aquifer provides 1/3 of all groundwater used in irrigation in the US Makes up the vast majority of the freshwater supply Springs & streams Water pumped to the surface
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Water Storage, Distribution & Management
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Water Storage Water must be stored so it is not polluted or lost for storage 2 types of storage Natural water storage: storage in lake, sea, ocean or aquifer Artificial water storage: storage in a tank, reservoir or other structure
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Water Distribution Moving water from its source to where it is needed Aqueducts are channels for carrying water Pipe systems are also used Many storage tanks are elevated to provide pressure to help in distribution
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Water Management Providing potable water Potable water: water that is safe for humans to use for drinking, cooking and washing
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Characteristics of Potable Water Odor & Taste Varies depending on source Some systems add chlorine to control water quality; kills bacteria & oxidizes iron Color People prefer clear Not all unclear water is bad pH Neutral water: pH ranges from 4.0-9.0 Treatments are used to adjust water pH to 7.0-7.8 Chemical & Pesticide Residues Coliform Bacteria Water contaminated with human waste E. Coli Alkalinity The presence of salts of weak acids in the water Related to hardness Hardness: concentration of calcium & magnesium ions in water Dissolved Solid Materials & Turbidity Water may have dissolved materials in it Turbidity is the result of suspended solid material; can appear cloudy Heavy Metals Mercury & Lead can pose health problems if present in water
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Water Treatment Water may need treatment POU (Point of Use filtration)-water is treated in home or business Some can be used as is Well Water Often needs no treatment May need chlorination sometimes Some homes use softeners Subsurface Water Generally needs treatment 1. Screening-remove large objects 2. Presedimentation (river water) & sedimentation (surface water) 3. Chlorination-chlorine added to kill bacteria 4. Final filtration-water is filtered through sand & charcoal filters
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So, what’s in a bottle of water?
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