Global Water Science Research & Exploration Spring 2010
Population density http://earthtrends.wri.org/text/population-health/map-192.html WRI, 2000 based on CIESIN 2000
Water Scarcity Index http://maps.grida.no/go/graphic/water-scarcity-index Philippe Rekacewicz (Le Monde diplomatique), February 2006
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 Drainage Outlet Definition? 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.
Collect Process and store Transport Functions of watersheds • Water • Sediments, soils • Dissolved minerals, metals, nutrients • Biological material
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
Los Angeles Region Watersheds Ballona WS
Ballona Watershed 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 Water budgets helps us evaluate sensitivity to change!