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The Water Cycle/ Water Resources: Global to Local

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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 ... – PowerPoint PPT presentation

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Title: The Water Cycle/ Water Resources: Global to Local


1
The Water Cycle/Water Resources Global to Local
  • Ellen Metzger
  • BAESI Californias Resources
  • July 2010

2
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?

3
Distribution of Earths Water
Source USGS
4
(No Transcript)
5
Water Cycle ReservoirsResidence times
6
Groundwater

Source USGS
Terms Water table Aquifer
7
Overuse of Ground WaterCone of Depression
http//web.arc.losrios.edu/borougt/ConeOfDepressi
on.gif
8
Subsidence in Santa Clara Valley
Source USGS
9
San Joaquin Valley Subsidence 1925-1977" From
USGS Professional Paper 1401-A/ Photo by Dick
Ireland, USGS, 1977
10
Climate Change Hydrologic Change
http//www.fs.fed.us/emphasis/products/water-clima
te-brochure.pdf
11
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/ind
ex.html
12
Impacts of Climate Change
  • Changes in Water Availability
  • Quantity
  • Quality
  • Timing
  • Distribution

13
Climate Change and Water in California
http//www.water.ca.gov/climatechange/docs/062807f
actsheet.pdf
14
Climate Change Impacts to Californias 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/062807
factsheet.pdf
15
http//www.water.ca.gov/climatechange/docs/062807f
actsheet.pdf
16
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
17
Sea Level Rise
18
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
19
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/

20
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
21
The World Water Crisis
http//maps.grida.no/library/files/increased-globa
l-water-stress_003.jpg
22
http//www.unep.org/dewa/vitalwater/jpg/0221-water
stress-EN.jpg
23
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
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