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The Water Cycle/ Water Resources: Global to Local. Ellen Metzger BAESI: California’s Resources July 2010. Water in the Earth System. What are some reservoirs for water in the Earth system? What are some processes that move water through the Earth system?

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the water cycle water resources global to local

The Water Cycle/Water Resources: Global to Local

Ellen Metzger

BAESI: California’s Resources

July 2010

water in the earth system
Water in the Earth System
  • What are some reservoirs for water in the Earth system?
  • What are some processes that move water through the Earth system?
  • What is the source of energy for the water cycle?
groundwater
Groundwater

Source: USGS

Terms: Water table

Aquifer

overuse of ground water cone of depression
Overuse of Ground Water:Cone of Depression

http://web.arc.losrios.edu/~borougt/ConeOfDepression.gif

slide9

San Joaquin Valley: Subsidence 1925-1977" From USGS Professional Paper 1401-A/ Photo by Dick Ireland, USGS, 1977

climate change hydrologic change
Climate Change = Hydrologic Change

http://www.fs.fed.us/emphasis/products/water-climate-brochure.pdf

climate change and water
Climate Change and Water
  • Future effect of climate change on global water resources depends on both
    • Climatic factors AND
    • Non-climatic factors
      • Population growth
      • Changes in economy
      • Development of new technology
      • Changes in watershed characteristics
      • Watershed management

http://www.epa.gov/climatechange/effects/water/index.html

impacts of climate change
Impacts of Climate Change
  • Changes in Water Availability
    • Quantity
    • Quality
    • Timing
    • Distribution
climate change and water in california
Climate Change and Water in California

http://www.water.ca.gov/climatechange/docs/062807factsheet.pdf

climate change impacts to california s water resources
Climate Change Impacts to California’s Water Resources
  • By 2050: loss of at least 25 percent of the Sierra snowpack
  • More variable weather patterns
    • More flooding and longer, more severe droughts
  • Rising water temperatures and changes in runoff patterns

may adversely impact salmon and other species.

  • Sea level rise will threaten many coastal communities

as well as the sustainability of the Sacramento-San Joaquin Delta.

    • Salt water intrusion

http://www.water.ca.gov/climatechange/docs/062807factsheet.pdf

slide15

http://www.water.ca.gov/climatechange/docs/062807factsheet.pdfhttp://www.water.ca.gov/climatechange/docs/062807factsheet.pdf

potential reduction in hydropower
Potential reduction in hydropower

Increased population and greater demand for energy

Decreased snow melt flowing through = decreased potential for hydropower production

However, future precipitation projections are uncertain.

Shasta dam

(USGS)

http://www.climatechoices.org/ca/site/ca/site/our-changing-climate.html

on line resources for teaching about water resources
On-line Resources for Teaching About Water Resources
  • Water Footprint Calculator – H20 Conserve
  • The Hidden Water We Use (National Geographic)
  • Where Does My Water Come From? (Water Education Foundation)
  • Water Science for Schools (USGS)

http://www.h2oconserve.org/img/wc.png

water footprint
Water Footprint
  • A measure of water use
  • Can be calculated for individuals, businesses, cities, countries, and products.
  • Measures both
    • Direct water use (such as for drinking and cleaning) and
    • Indirect water use (the water required to produce goods and services).
      • Described as “embedded or “virtual’ water” water
  • Average annual water footprints (m3 per person)
    • China: 950
    • UK: 1,695
    • US: 2,900

Source: http://wwf.panda.org/what_we_do/footprint/water/

the word water crisis
The Word Water Crisis
  • Access to clean water is a basic human need
    • Drinking
    • Washing
    • Sanitation
    • Agriculture
  • Despite apparent abundance of water in developed nations, billions pf people worldwide lack access to safe drinking water

http://www.unwater.org/img/sec2.jpg

the world water crisis
The World Water Crisis

http://maps.grida.no/library/files/increased-global-water-stress_003.jpg

slide22

http://www.unep.org/dewa/vitalwater/jpg/0221-waterstress-EN.jpghttp://www.unep.org/dewa/vitalwater/jpg/0221-waterstress-EN.jpg

is this sustainable
Is this sustainable?
  • Limited fresh water resources
  • Uneven distribution of

water resources

    • Regional conflict/warfare
  • Water pollution
    • water-borne diseases
  • Growing population
  • Impact of climate change

on water resources

http://www.unwater.org/img/usepercentage.jpg