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Global Water. Science Research & Exploration Spring 2010. Global Climate Zones. Population density. WRI, 2000 based on CIESIN 2000. Water Scarcity Index.

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Global water

Global Water

Science Research & Exploration

Spring 2010

Population density
Population density

WRI, 2000 based on CIESIN 2000

Water scarcity index
Water Scarcity Index

Philippe Rekacewicz (Le Monde diplomatique), February 2006

Water trivia
Water Trivia!

Where is the wettest place on earth?a) Mt. Waialeale, Hawaii b) Mt. Kilimanjaro, Tanzania

c) Amazon Forest, Brazil

Where is the driest Place on Earth?

a) Death Valley, California b) Atacama Desert, Chile

c) Sahara Desert, Africa

How much rain does Los Angeles normally get every year?

a) 50 inches b) 25 inches c) 15 inches

How much water does the average person in Los Angeles use each day?

150 gallons b) 500 gallons c) 40 gallons

How much water does a person normally use for a 5 minute shower?

a) 35 gallons b) 100 gallons c) 5 gallons

Which group uses the most water in the western U.S.?

a) Urban Cities b) Industry c) Agriculture

What is a watershed?

Watershed Boundary




A watershed is the land area where water collects and drains through a single outlet.

It can drain onto a lower level property or into a river, ocean or other body of water.


Process and store


Functions of watersheds

  • Water

  • Sediments, soils

  • Dissolved minerals, metals, nutrients

  • Biological material

Watersheds have inputs and outputs

Inputs = water coming into the system

Outputs = water leaving the system

What are some of the inputs?

What are some of the outputs?

Inputs – Outputs = Change in Storage

(think bank account, without interest!!)

Watersheds have inputs and outputs



130 sq. miles

Land use:

64% residential 8% commercial 4% industrial

17% open space

Which type of watershed are we in?

Where do you expect to see more pollution?

Effects of urbanization
Effects of Urbanization

Water budgets helps us evaluate sensitivity to change!