1 / 36

Water: A Limited Resource

Chapter 14. Water: A Limited Resource. The Importance of Water. Water: shapes continents moderates our climate is essential for all living organisms. The Importance of Water. Composition and polarity. Hydrogen bonding properties. Properties of Water. The Importance of Water.

cira
Download Presentation

Water: A Limited Resource

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 14 Water: A Limited Resource

  2. The Importance of Water • Water: • shapes continents • moderates our climate • is essential for all living organisms

  3. The Importance of Water Composition and polarity Hydrogen bonding properties • Properties of Water

  4. The Importance of Water • Properties of Water Chemical composition of seawater

  5. The Importance of Water • The Hydrologic Cycle

  6. The Importance of Water • Our Supply of Fresh Water

  7. The Importance of Water • Types of water: • surface water • runoff • drainage basin • groundwater • aquifers

  8. The Importance of Water • Largest watersheds

  9. The Importance of Water • Aquifers

  10. Water Use and Resource Problems • Problems fall into 3 categories: • Too much • Too little • Poor quality / contamination (Chap. 22)

  11. Water Use and Resource Problems • Too Much Water • Removing vegetation and constructing buildings increases flooding potential on flood plains

  12. Water Use and Resource Problems Channelization • Too Much Water • Flood Management

  13. Water Use and Resource Problems • Too Much Water • Flood Management Levees with natural river

  14. Water Use and Resource Problems • Case-in-Point: The Floods of 1993

  15. Water Use and Resource Problems • Too Little Water • Droughts • Overdrawing Surface Waters • Aquifer depletion • Causes subsidence • Can lead to saltwater intrusion

  16. Water Use and Resource Problems • Saltwater intrusion

  17. Water Use and Resource Problems • Too Little Water • Droughts • Overdrawing Surface Waters • Aquifer depletion • Causes subsidence • Can lead to saltwater intrusion • Salinization of Irrigated Soil

  18. Average annual precipitation

  19. Water Problems in the US • Surface Water • Most problems in the West and Southwest • Aqueducts transport water from distance sources

  20. Water Problems in the US • Examples of problems: • Mono Lake • The Colorado River • Basin Surface Water

  21. Water Problems in the US • Groundwater • Aquifer depletion

  22. Water Problems in the US • Groundwater • Aquifer depletion • - Ogallala Aquifer

  23. Global Water Problems • Water distribution globally is very inequitable • In addition, stable runoff varies • Drinking Water Problems • 1.4 billion lack safe water • 2.9 billion lack proper wastewater disposal

  24. Global Water Problems • Population Growth and Water Problems • India – 8,000 villages have no local water • China – water table falling 2-3 m / year • Pakistan – lack of water led to riots in 2001 • Mexico – water table falling 3.5 m / year in Mexico City

  25. Global Water Problems The Rhine River Basin • Sharing Water Resources among Countries

  26. Global Water Problems 1997 • Sharing Water Resources among Countries The Aral Sea 1976

  27. Global Water Problems • Potentially Volatile International Water Situations • Jordan River • Nile River Sharing Water Resources among Countries

  28. Water Management • Providing a Sustainable Water Supply • Sustainable water use seeks to provide water to future generations without damaging ecosystems.

  29. Water Management • Providing a Sustainable Water Supply • Dams and Reservoirs • Pros – • Ensure year-round water supply • Hydropower • Recreation

  30. Water Management • Providing a Sustainable Water Supply • Dams and Reservoirs • Cons – • Alter ecosystems • Sediment Deposition

  31. Water Management • Providing a Sustainable Water Supply • Dams and Reservoirs • Example: Effect of dam on Colorado River in Grand Canyon

  32. Water Management • Providing a Sustainable Water Supply • Water Diversion Projects

  33. Water Management Condenses Simplified process: Produces steam Pure water is collected Water boiled Salt water • Providing a Sustainable Water Supply • Desalinization Two methods: 1) Distillation

  34. Water Management Pressure salt H2O • Providing a Sustainable Water Supply • Desalinization Two methods: 1) Distillation 2) Reverse osmosis Salt impermeable membrane Salt water Fresh water

  35. Water Conservation Drip or trickle irrigation • Reducing Agricultural Water Waste

  36. Water Conservation Recycling water Xeriscaping • Reducing Agricultural Water Waste • Reducing Water Waste in Industry Reducing Municipal Water Waste

More Related