Water Resources Chapter 13 Core Case Study Water
- Slides: 104
Water Resources Chapter 13
Core Case Study: Water Conflicts in the Middle East: A Preview of the Future § Water shortages in the Middle East: hydrological poverty § Nile River § Jordan Basin § Tigris and Euphrates Rivers § Peacefully solving the problems
Three Major River Basins in the Middle East
13 -1 Will We Have Enough Usable Water? § Concept 13 -1 A We are using available freshwater unsustainably by wasting it, polluting it, and charging too little for this irreplaceable natural resource. § Concept 13 -1 B One of every six people does not have sufficient access to clean water, and this situation will almost certainly get worse.
Freshwater Is an Irreplaceable Resource That We Are Managing Poorly (1) § Why is water so important? § Earth as a watery world: 71% § Freshwater availability: 0. 024% § Poorly managed resource § Hydrologic cycle § Water pollution
Freshwater Is an Irreplaceable Resource That We Are Managing Poorly (2) § Access to water is • • A global health issue An economic issue A women’s and children’s issue A national and global security issue
Girl Carrying Well Water over Dried Out Earth during a Severe Drought in India
Most of the Earth’s Freshwater Is Not Available to Us § Hydrologic cycle • Movement of water in the seas, land, and air • Driven by solar energy and gravity § People divided into • Water haves • Water have-nots
We Get Freshwater from Groundwater and Surface Water (1) § Ground water § Zone of saturation § Water table § Aquifers • Natural recharge • Lateral recharge
We Get Freshwater from Groundwater and Surface Water (2) § Surface Water • Surface runoff • Watershed (drainage) basin • Reliable runoff • 1/3 of total
Natural Capital: Groundwater System: Unconfined and Confined Aquifer
Unconfined Aquifer Recharge Area Evaporation and transpiration Evaporation Precipitation Confined Recharge Area Runoff Flowing artesian well Infiltration Less permeable material such as clay Well requiring a pump Water table Stream Lake Infiltration Unconfined aquifer Confining impermea ble rock layer Fig. 13 -3, p. 316
We Use a Large and Growing Portion of the World’s Reliable Runoff § 2/3 of the surface runoff: lost by seasonal floods § 1/3 runoff usable • Domestic: 10% • Agriculture: 70% • Industrial use: 20% § Fred Pearce, author of When the Rivers Run Dry
Case Study: Freshwater Resources in the United States § More than enough renewable freshwater, unevenly distributed § Effect of • Floods • Pollution • Drought § 2007: U. S. Geological Survey projection • Water hotspots
Average Annual Precipitation and Major Rivers, Water-Deficit Regions in U. S.
Fig. 13 -4 a, p. 317
Average annual precipitation (centimeters) Less than 41 81– 122 41– 81 More than 122 Fig. 13 -4 a, p. 317
Fig. 13 -4 b, p. 317
Acute shortage Shortage Adequate supply Metropolitan regions with population greater than 1 million Fig. 13 -4 b, p. 317
Water Hotspots in 17 Western U. S. States
Washington Montana Oregon Idaho Wyoming Nevada North Dakota South Dakota Nebraska Utah Colorado California Arizona New Mexico Kansas Oklahoma Texas Highly likely conflict potential Substantial conflict potential Moderate conflict potential Unmet rural water needs Fig. 13 -5, p. 318
Water Shortages Will Grow (1) § Dry climate § Drought § Too many people using a normal supply of water
Water Shortages Will Grow (2) § Wasteful use of water § China and urbanization § Hydrological poverty
Natural Capital Degradation: Stress on the World’s Major River Basins
Asia Europe North America Africa South America Australia Stress High None Fig. 13 -6, p. 319
Long-Term Severe Drought Is Increasing § Causes • Extended period of below-normal rainfall • Diminished groundwater § Harmful environmental effects • • • Dries out soils Reduces stream flows Decreases tree growth and biomass Lowers net primary productivity and crop yields Shift in biomes
In Water-Short Areas Farmers and Cities Compete for Water Resources § 2007: National Academy of Science study • Increased corn production in the U. S. to make ethanol as an alternative fuel • Decreasing water supplies • Aquifer depletion • Increase in pollution of streams and aquifers
Who Should Own and Manage Freshwater Resources? (1) § Most water resources • Owned by governments • Managed as publicly owned resources § Veolia and Suez: French companies • Buy and manage water resources • Successful outcomes in many areas
Who Should Own and Manage Freshwater Resources? (2) § Bechtel Corporation • Poor water management in Bolivia § A subsidiary of Bechtel Corporation • Poor water management in Ecuador § Potential problems with full privatization of water resources • Financial incentive to sell water; not conserve it • Poor will still be left out
13 -2 Is Extracting Groundwater the Answer? § Concept 13 -2 Groundwater that is used to supply cities and grow food is being pumped from aquifers in some areas faster than it is renewed by precipitation.
Water Tables Fall When Groundwater Is Withdrawn Faster Than It Is Replenished § India, China, and the United States • Three largest grain producers • Overpumping aquifers for irrigation of crops § India and China • Small farmers drilling tubewells • Effect on water table § Saudi Arabia • Aquifer depletion and irrigation
Trade-Offs: Withdrawing Groundwater, Advantages and Disadvantages
TRADE-OFFS Withdrawing Groundwater Advantages Disadvantages Useful for drinking and irrigation Aquifer depletion from overpumping Available year-round Sinking of land (subsidence) from overpumping Exists almost everywhere Renewable if not overpumped or contaminated No evaporation losses Cheaper to extract than most surface waters Aquifers polluted for decades or centuries Saltwater intrusion into drinking water supplies near coastal areas Reduced water flows into surface waters Increased cost and contamination from deeper wells Fig. 13 -7, p. 321
Natural Capital Degradation: Irrigation in Saudi Arabia Using an Aquifer
Case Study: Aquifer Depletion in the United States § Ogallala aquifer: largest known aquifer • Irrigates the Great Plains • Water table lowered more than 30 m • Cost of high pumping has eliminated some of the farmers • Government subsidies to continue farming deplete the aquifer further • Biodiversity threatened in some areas § California Central Valley: serious water depletion
Natural Capital Degradation: Areas of Greatest Aquifer Depletion in the U. S.
Groundwater Overdrafts: High Moderate Minor or none Fig. 13 -9, p. 322
Natural Capital Degradation: The Ogallala is the World’s Largest Known Aquifer
WYOMING SOUTH DAKOTA NEBRASKA COLORADO NEW MEXICO KANSAS OKLAHOMA TEXAS Miles 0 100 160 0 Kilometers Saturated thickness of Ogallala Aquifer Less than 61 meters (200 ft. ) 61– 183 meters (200– 600 ft. ) More than 183 meters (600 ft. ) (as much as 370 meters or 1, 200 ft. in places) Fig. 13 -10, p. 323
Groundwater Overpumping Has Other Harmful Effects (1) § Limits future food production § Bigger gap between the rich and the poor § Land subsidence • Mexico City § Sinkholes
Groundwater Overpumping Has Other Harmful Effects (2) § Groundwater overdrafts near coastal regions • Contamination of the groundwater with saltwater • Undrinkable and unusable for irrigation
Solutions: Groundwater Depletion, Using Water More Sustainably
SOLUTIONS Groundwater Depletion Prevention Control Waste less water Raise price of water to discourage waste Subsidize water conservation Tax water pumped from wells near surface waters Limit number of wells Set and enforce minimum stream flow levels Do not grow waterintensive crops in dry areas Divert surface water in wet years to recharge aquifers Fig. 13 -11, p. 324
Science Focus: Are Deep Aquifers the Answer? § Locate the deep aquifers; determine if they contain freshwater or saline water § Major concerns • Geological and ecological impact of pumping water from them • Flow beneath more than one country • Who has rights to it?
Active Figure: Threats to aquifers
13 -3 Is Building More Dams the Answer? § Concept 13 -3 Building dam and reservoir systems has greatly increased water supplies in some areas, but it has disrupted ecosystems and displaced people.
Large Dams and Reservoirs Have Advantages and Disadvantages (1) § Main goals of a dam and reservoir system • Capture and store runoff • Release runoff as needed to control: • • Floods Generate electricity Supply irrigation water Recreation (reservoirs)
Large Dams and Reservoirs Have Advantages and Disadvantages (2) § Advantages • Increase the reliable runoff available • Reduce flooding • Grow crops in arid regions
Large Dams and Reservoirs Have Advantages and Disadvantages (3) § Disadvantages • • • Displaces people Flooded regions Impaired ecological services of rivers Loss of plant and animal species Fill up with sediment within 50 years
Advantages and Disadvantages of Large Dams and Reservoirs
The Ataturk Dam Project in Eastern Turkey
Some Rivers Are Running Dry and Some Lakes Are Shrinking § Dams disrupt the hydrologic cycle § Major rivers running dry part of the year • • • Colorado and Rio Grande, U. S. Yangtze and Yellow, China Indus, India Danube, Europe Nile River-Lake Victoria, Egypt § Lake Chad Africa: disappearing
Case Study: The Colorado River Basin— An Overtapped Resource (1) § 2, 300 km through 7 U. S. states § 14 Dams and reservoirs § Located in a desert area within the rain shadow of the Rocky Mountains § Water supplied mostly from snowmelt of the Rocky Mountains
Case Study: The Colorado River Basin— An Overtapped Resource (2) § Supplies water and electricity for more than 25 million people § Irrigation of crops § Recreation
Case Study: The Colorado River Basin— An Overtapped Resource (3) § Four Major problems • Colorado River basin has very dry lands • Modest flow of water for its size • Legal pacts allocated more water for human use than it can supply • Amount of water flowing to the mouth of the river has dropped
Case Study: The Colorado River Basin— An Overtapped Resource (4) § What will happen if some of the reservoirs empty out? • Economic and ecological catastrophe • Political and legal battles over water
The Colorado River Basin
Aerial View of Glen Canyon Dam Across the Colorado River and Lake Powell
The Flow of the Colorado River Measured at Its Mouth Has Dropped Sharply
35 30 Hoover Dam completed (1935) Flow (billion cubic meters) 25 20 15 Glen Canyon Dam completed (1963) 10 5 0 1910 1920 1930 1940 1950 Year 1960 1970 1980 1990 2000 Fig. 13 -16, p. 328
Case Study: China’s Three Gorges Dam (1) § World’s largest hydroelectric dam and reservoir § 2 km long across the Yangtze River § Benefits • Electricity-producing potential is huge • Holds back the Yangtze River floodwaters • Allows cargo-carrying ships
Case Study: China’s Three Gorges Dam (2) § Harmful effects • Displaces about 5. 4 million people • Built over a seismic fault • Significance? • Rotting plant and animal matter producing CH 4 • Worse than CO 2 emissions • Will the Yangtze River become a sewer?
13 -4 Is Transferring Water from One Place to Another the Answer? § Concept 13 -4 Transferring water from one place to another has greatly increased water supplies in some areas, but it has also disrupted ecosystems.
CA, U. S. , Transfers Water from Water. Rich Areas to Water-Poor Areas § Water transferred by • Tunnels • Aqueducts • Underground pipes § May cause environmental problems § California Water Project
The California Water Project and the Central Arizona Project
Sacramento River CALIFORNIA NEVADA Shasta Lake Oroville Dam and Reservoir UTAH Feather Lake Tahoe River North Bay Aqueduct Hoover Dam and Reservoir (Lake Mead) Fresno in qu oa n. J y lle Va South Bay Aqueduct San Luis Dam and Reservoir Sacramento Sa San Francisco California Aqueduct Los Angeles Aqueduct Colorado River Aqueduct Santa Barbara Los Angeles San Diego Salton Sea Colorado River ARIZONA Central Arizona Project Phoenix Tucson MEXICO Fig. 13 -17, p. 330
Case Study: The Aral Sea Disaster (1) § Large-scale water transfers in dry central Asia § Salinity § Wetland destruction and wildlife § Fish extinctions and fishing
Case Study: The Aral Sea Disaster (2) § Wind-blown salt § Water pollution § Climatic changes § Restoration efforts
Natural Capital Degradation: The Aral Sea, Shrinking Freshwater Lake
1976 2006 Stepped Art Fig. 13 -18 a, p. 331
Ship Stranded in Desert Formed by Shrinkage of the Aral Sea
China Plans a Massive Transfer of Water § South-North Water Transfer Project § Water from three rivers to supply 0. 5 billion people § Completion in about 2050 § Impact • Economic • Health • Environmental
13 -5 Is Converting Salty Seawater to Freshwater the Answer? § Concept 13 -5 We can convert salty ocean water to freshwater, but the cost is high, and the resulting salty brine must be disposed of without harming aquatic or terrestrial ecosystems.
Removing Salt from Seawater Seems Promising but Is Costly (1) § Desalination • Distillation • Reverse osmosis, microfiltration § 15, 000 plants in 125 countries • Saudi Arabia: highest number
Removing Salt from Seawater Seems Promising but Is Costly (2) § Problems • High cost and energy footprint • Keeps down algal growth and kills many marine organisms • Large quantity of brine wastes § Future economics
Science Focus: The Search for Improved Desalination Technology § Desalination on offshore ships • Solar or wind energy § Better membranes § Better disposal options for the brine waste § Reduce water needs, conserve water
13 -6 How Can We Use Water More Sustainably? § Concept 13 -6 We can use water more sustainably by cutting water waste, raising water prices, slowing population growth, and protecting aquifers, forests, and other ecosystems that store and release water.
Reducing Water Waste Has Many Benefits (1) § Water conservation • Improves irrigation efficiency • Improves collection efficiency • Uses less in homes and businesses
Reducing Water Waste Has Many Benefits (2) § Worldwide: 65– 70% loss • Evaporation, leaks, etc. § Water prices: low cost to user § Government subsidies: more needed?
We Can Cut Water Waste in Irrigation § Flood irrigation • Wasteful § Center pivot, low pressure sprinkler § Low-energy, precision application sprinklers § Drip or trickle irrigation, microirrigation • Costly; less water waste
Major Irrigation Systems
Center pivot Drip irrigation (efficiency 90– 95%) Gravity flow (efficiency 80% with low-pressure sprinkler and 90– 95% with LEPA sprinkler) Above- or below-ground (efficiency 60% and 80% with surge valves) pipes or tubes deliver water to individual plant roots. Water usually comes from an aqueduct system or a nearby river. Water usually pumped from underground and sprayed from mobile boom with sprinklers. Fig. 13 -20, p. 335
Center pivot Drip irrigation (efficiency 90– 95%) Gravity flow (efficiency 80% with low-pressure sprinkler and 90– 95% with LEPA sprinkler) Above- or below-ground (efficiency 60% and 80% with surge valves) pipes or tubes deliver water to individual plant roots. Water usually comes from an aqueduct system or a nearby river. Water usually pumped from underground and sprayed from mobile boom with sprinklers. Stepped Art Fig. 13 -20, p. 335
Solutions: Reducing Irrigation Water Waste
Developing Countries Use Low-Tech Methods for Irrigation § Human-powered treadle pumps § Harvest and store rainwater § Create a canopy over crops: reduces evaporation § Fog-catcher nets
We Can Cut Water Waste in Industry and Homes § Recycle water in industry § Fix leaks in the plumbing systems § Use water-thrifty landscaping: xeriscaping § Use gray water § Pay-as-you-go water use
Solutions: Reducing Water Waste
We Can Use Less Water to Remove Wastes § Can we mimic how nature deals with waste? § Waterless composting toilets
We Need to Use Water More Sustainably § “The frog does not drink up the pond in which it lives” § Blue revolution
Solutions: Sustainable Water Use
SOLUTIONS Sustainable Water Use Waste less water and subsidize water conservation Do not deplete aquifers Preserve water quality Protect forests, wetlands, mountain glaciers, watersheds, and other natural systems that store and release water Get agreements among regions and countries sharing surface water resources Raise water prices Slow population growth Fig. 13 -23, p. 337
What Can You Do? Water Use and Waste
13 -7 How Can We Reduce the Threat of Flooding? § Concept 13 -7 We can lessen the threat of flooding by protecting more wetlands and natural vegetation in watersheds and by not building in areas subject to frequent flooding.
Some Areas Get Too Much Water from Flooding (1) § Flood plains • • Highly productive wetlands Provide natural flood and erosion control Maintain high water quality Recharge groundwater § Benefits of floodplains • Fertile soils • Nearby rivers for use and recreation • Flatlands for urbanization and farming
Some Areas Get Too Much Water from Flooding (2) § Dangers of floodplains and floods • • Deadly and destructive Human activities worsen floods Failing dams and water diversion Hurricane Katrina and the Gulf Coast • Removal of coastal wetlands
Natural Capital Degradation: Hillside Before and After Deforestation
Oxygen released by vegetation Diverse ecological habitat Evapotranspiration Trees reduce soil erosion from heavy rain and wind Agricultural land Tree roots stabilize soil Vegetation releases water slowly and reduces flooding Forested Hillside Fig. 13 -25 a, p. 339
Tree plantation Roads destabilize hillsides Evapotranspiration decreases Overgrazing accelerates soil erosion by water and wind Winds remove fragile topsoil Agricultural land is flooded and silted up Gullies and landslides Heavy rain erodes topsoil Silt from erosion fills rivers and reservoirs Rapid runoff causes flooding After Deforestation Fig. 13 -25 b, p. 339
Oxygen released by vegetation Diverse ecological habitat Tree plantation Evapotranspiration Trees reduce soil erosion from heavy rain and wind Agricultural land Tree roots stabilize soil Roads destabilize hillsides Evapotranspiration decreases Overgrazing accelerates soil erosion by water and wind Winds remove fragile topsoil Agricultural land is flooded and silted up Gullies and landslides Heavy rain erodes topsoil Vegetation releases water slowly and reduces flooding Forested Hillside Silt from erosion fills rivers and reservoirs Rapid runoff causes flooding After Deforestation Stepped Art Fig. 13 -25 a, p. 339
Case Study: Living Dangerously on Floodplains in Bangladesh § Dense population § Located on coastal floodplain § Moderate floods maintain fertile soil § Increased frequency of large floods § Effects of development in the Himalayan foothills § Destruction of coastal wetlands
We Can Reduce Flood Risks § Rely more on nature’s systems • Wetlands • Natural vegetation in watersheds § Rely less on engineering devices • Dams • Levees
Solutions: Reducing Flood Damage
SOLUTIONS Reducing Flood Damage Prevention Control Preserve forests on watersheds Straighten and deepen streams (channelization) Preserve and restore wetlands in floodplains Tax development on floodplains Use floodplains primarily for recharging aquifers, sustainable agriculture and forestry Build levees or floodwalls along streams Build dams Fig. 13 -26, p. 340
Active Figure: Effects of deforestation
- Nike core competency
- Best case worst case average case
- Water and water and water water
- Project failure case study
- Chapter 8 study guide human resources culture and diversity
- Chapter 8 study guide human resources culture and diversity
- Transformation process in operations management
- Fixed resources examples
- Renewable vs nonrenewable resources worksheet
- 14.2 uses of freshwater
- Chapter 11 section 1: water resources answers
- Chapter 4 landforms water and natural resources
- Resource capabilities and core competencies
- Chapter 9 section 2 industrialization case study manchester
- Chapter 12 case study
- Chapter 10 case study
- Case study chapter 4
- The brittle, rocky outer layer of earth
- What is the crust
- Basic layers of the earth
- Core capabilities and core rigidities
- Ung core curriculum
- Water resources unit
- Water resources
- Norway water resources
- Sabah water resources enactment 1998
- Importance water resources
- 2030 water resources group
- Meaning of grass
- Water is one of the most important resource
- Natural resources water cycle
- Maharashtra water resources department
- Water resources list
- Natural resources and associated problems
- Conclusion of water resources
- Fish map
- Air and water resources lesson 4
- Determine
- Volusia county water resources and utilities
- Volusia county water department
- Division of water resources utah
- Oregon water resources department
- Class 8 english chapter 7 water water everywhere
- Short case vs long case
- Average case complexity of binary search
- Glennan building cwru
- Bubble sort algorithm pseudocode
- Bubble sort best case and worst case
- Bubble sort best case and worst case
- Law of sines ambiguous case
- Core values of water refilling station
- Zara technology case study
- Sheryl kantrowitz
- Kf motorcycle accident
- Swot analysis of whole foods
- Action research vs case study
- Volkswagen of america: managing it priorities
- Valuation of plant and machinery
- Mini case study example
- Starbucks foreign direct investment case study
- Case study 11
- Notasi uml
- Illustrative case study example
- Tuna for lunch case study
- Tuna for lunch case study answer key
- Amazon rainforest case study
- Supermarket seo case study
- Threats to biodiversity a case study of hawaiian birds
- Mount st helens case study
- Therac-25 case study
- A wilderness weather station case study
- San juanico disaster
- Gaslighting case study
- Effects of coyote removal in texas answers
- Conclusion of case study
- Attwirless
- Business model of telegram
- Swanage coastal management case study
- Maq corporation case study solution
- Silver fiddle construction
- Flair furniture company linear programming
- Rosa parks case study
- Demand characteristics
- Pnuemothorax xray
- Qualitative research process steps
- Phenomenology vs case study
- Location strategy in operations management
- Dune climax
- Pku
- Perioperative case study
- Periodontal case study
- Cargill everyday performance management
- Patriot missile
- Wholesale your garden gloves case
- Old spice case study
- Medical case study presentation
- National center for case study teaching in science
- National center for case study teaching in science
- National center for case study teaching in science
- National center for case study teaching in science
- Case study on microsoft azure in cloud computing
- Alasan menggunakan studi kasus
- Study case adalah
- Metallgesellschaft case
- Cpm matrix of mcdonald's