1. Water

2. Key H20 Characteristics
Water is the prime constituent of all living organisms.
Water moves easily-from one physical state to another, and from one place to another.
Water slowly absorbs and releases large quantities of energy.
Water is a superior solvent.
Michael D. Lee Ph.D. Geography and Environmental Studies
(Source: Wright & Nebel 2002)

3. Importance of Water Properties
Running water can quickly erode topsoil rendering farmland infertile and streams contaminated.
Lack of access to clean water supplies can quickly lead to dehydration and death.
Chemical spills, excess nutrients & acids dissolved in H20 can lead to massive die offs.
Michael D. Lee Ph.D. Geography and Environmental Studies

4. Water Water Pollution Supply, Renewal and Use Too little Water
Dams and Reservoirs
Transferring water
Groundwater and Saltwater
Efficiency
Too Much Water
Water Pollution

5. Available Water Total = 326 million cubic miles
                                                                                                                    
                                                                                                                    
Available Water
Total = 326 million cubic miles
97% of Earth’s water is in oceans
2.997% is locked up in ice caps and glaciers
0.003% is easily accessible
Soil moisture
Groundwater
Water vapor
Lakes
Streams

6. Water Supply & Use

7. Water Cycle
SW%20Management.htm

8. Hydrologic Cycle Powered by solar energy and gravity
Evaporation and precipitation
Continuous recycling of water
Runoff
Infiltration
Evaporation
Temporary storage as snow and ice
Temporary storage in lakes
Temporary storage in plants (transpiration) and animals
Chemical reactions with rocks and minerals
Volcanism also causes melting of snow caps and mudflows as melted water mixes with ash
Source of additional water? volcanism (steam)

9. Surface Water
Surface runoff flows into streams, lakes, wetlands and reservoirs
A watershed or drainage basin
Region that drains into a streams, lakes, wetlands or reservoirs
watershed.asp

10. Groundwater
As precipitation infiltrates and percolates through voids in soil and rock
Pores, fractures, crevices, etc.
Shallow rock has little moisture
Zone of saturation is at a depth were ground is filled with water
Top of this zone is water table
Falls in dry weather
Rises in wet weather

11. HOW RIVERS WORK: the role of groundwater
outlines/groundwater.html

12. Aquifers
Porous, water-saturated layers of sand, gravel or bedrock through which groundwater flows
Area of land that supplies water to aquifer is called the recharge area
Natural recharge is when water percolates downward, but sometimes lateral recharge occurs

14. Groundwater Movement
Groundwater moves from recharge area through an aquifer and out a discharge area
well, spring, lake, geyser, artesian well, steam, ocean
Normally moves downhill at only a meter per year
Some aquifers get little recharge and were formed thousands of years ago
Removal from these nonrenewable resources is called water mining

15. Use of Fresh Water United States China 41% agriculture 87% agriculture
38% power plant cooling
11% industry
10% public
China
87% agriculture
7% industry
6% public

16. Water Use Globally People and Planet
70% of all water withdrawn for human use on an annual basis is soaked up by agriculture (mostly in the form of irrigation)
Industry accounts for 23%
Domestic use (household, drinking water, sanitation) accounts for about 7%

17. Water Use People and Planet
The average person needs a minimum of five litres (1.3 gallons) of water per day to survive in a moderate climate at an average activity level, according to UN figures.
The minimum amount of water needed for drinking and cooking, bathing and sanitation is 50 litres (13 gallons) per day.

18. Water Use - (minimum 13 gallons) People and Planet
The average person in the United States uses between to 300 litres of water ( gallons) per day for drinking, cooking bathing, and watering their yard.
The average person in the Netherlands uses 104 litres per day (27 gallons).
The average person in the African nation of Gambia uses litres per day (1.2 gallons of water).

19. Water Use - United States
In 1990, about 408,000 million gallons (Mgal/d) of water were used each day
Of that, about 339,000 Mgal/d was fresh water and about 69,400 Mgal/d was saline water
California used the most water, about 46,800 Mgal/d, with most of that going towards irrigation
The state with the second-highest water use was Texas, with about 25,200 Mgal/d, mostly for use in the power-production industries and for irrigation

20. 1 Mgal/d = 1.547 cubic feet per second
Some conversions:
1 Mgal/d = cubic feet per second
1 Mgal/d = thousand gallons per minute
1 Mgal/d = 1,121 thousand acre-feet per year
1 million gallons = 3.07 acre feet

21. Water Water Pollution Too little Water Supply, Renewal and Use
Dams and Reservoirs
Transferring water
Groundwater and Saltwater
Efficiency
Too Much Water
Water Pollution

22. Too Little Water Causes Dry climate
Drought - a period in which precipitation is much lower and evaporation is much higher
Desiccation - drying of soil because of such activities as deforestation and overgrazing
Water stress - low per capita availability of water caused by overpopulation

23. Precipitation Varies Greatly
US cities vary in their precipitation from an average of less than 8 to 60 inches a year.
Globally, the extreme is even greater – averages of less than 1 inch to more than 70 inches per year.
However, this masks variations between years.
Some locations may get ten times more, or less than 1/10 of their annual average from year to year.
Meeting demands for water when precipitation is so highly varied creates many challenges.

24. whyfiles.org/131fresh_water/ 2.html
atmos.htm
whyfiles.org/131fresh_water/ 2.html

25. Global Precipitation Patterns
Wright and Nebel, 2002.
Michael D. Lee Ph.D. Geography and Environmental Studies

27. In most areas of Nevada and California, potential transpiration and evaporation is in excess of precipitation, which causes a net moisture deficit

28. Drought may spark food price hike Tuesday, November 12, 2002
SYDNEY, Australia -- All but one percent of Australia's most populous state, New South Wales, has been bit by the country's worst drought in a century, with retailers warning that if rain does not fall soon, the country will likely face massive food price hikes.

29. Water Water Pollution Dams and Reservoirs and Transferring water
Supply, Renewal and Use
Too little Water
Dams and Reservoirs and
Transferring water
Groundwater and Saltwater
Efficiency
Too Much Water
Water Pollution

30. Water and Civilization
Many anthropologists and historians believe the need to manage water played a major role in the development of early systems of government.
In Mesopotamia, in the Fertile Crescent where the Tigris and Euphrates Rivers come together, water allowed the rise of irrigation-based agriculture, but this required coordination and rules to permit equitable access to water downstream.
Proto-laws and governments were thus developed some 4,400 years BP
Ancient communities that prospered were those that generally well managed their water supplies.
Michael D. Lee Ph.D. Geography and Environmental Studies

31. Examples of Water Management
Many civilizations built impressive water management systems – to bring water to places where people wanted to be or where crops could be grown, but where it was naturally insufficient.
Egyptians built dykes, canals and water lifts to extend agricultural limits.
Middle East and North African nomads built qanats (underground chain wells).
Nabateans built runoff harvesting systems – cisterns and flood terraces.
Incas built canals to catch snowmelt from the Andes to the coastal desert, and terraces to flood for farming.
Romans built municipal aqueducts and sewers to serve burgeoning settlements.
For a good, fun site on water history go here.
Michael D. Lee Ph.D. Geography and Environmental Studies

32. Egyptians perfected the shadouf to draw water from canals and the river to the adjacent bank and into ditches.
Michael D. Lee Ph.D. Geography and Environmental Studies
Nomadic herders and, later, sedentary civilizations developed chains of wells – qanats, karez, foggaras, falaj – to route water across miles of desert from distant aquifers.

33. Water for Power
In addition to its uses for municipal purposes (drinking, sanitation, etc.) and for farming, moving water also has tremendous power to do work.
This too has been harnessed for millennia – first to lift water out of the river itself, then to grind grain and turn gears for machinery like looms, and then for electricity.
Water wheels have been in use for more than 2,000 years and were thought to have been a major factor in the advancement of European societies in the middle ages, as labor was freed for other purposes than farming.
Following the discovery of electricity and the pioneering of electric light by Edison, in the 1880s hydropower systems were built to generate electricity to send through transmission lines to homes and businesses.
Michael D. Lee Ph.D. Geography and Environmental Studies

34. Example of noria – water driven wheels lifting water into irrigation ditches or elevated aqueducts (This is in Vietnam)
Slaters Mill in Rhode Island, one of the earliest American water powered industrial systems.
Artists impression of the Three Gorges Project, Yangtze River, China – world’s biggest hydropower project 19 m kW.
Michael D. Lee Ph.D. Geography and Environmental Studies

35. Increasing Water Supplies
Build dams and reservoirs to store runoff
Bring in surface water from another area
Withdraw groundwater
Convert salt water to fresh water (desalination)
Improve the efficiency of water use

36. Chinese Dam Fish Bypass System Earthen Dam Aswan Dam, Egypt Hoover Dam

37. Large Dams - Pros Collect and store water from rain and snow
Produce electricity
Irrigate land below the dam
Control flooding
Provide water to cities, towns and rural areas
Provide recreational activities such as swimming, boating, fishing

38. Large Dams - Cons Enormous loss of water due to evaporation
Mass of water can cause earthquakes
Flooded land destroys forests or cropland and displaces people
Danger of Dam collapse
Downstream areas deprived of nutrient-rich soil, which will eventually clog the reservoir
Migration and spawning of fish disrupted
Expensive to build