Presentation on theme: " Why is Dam-building such a controversial issue?."— Presentation transcript:
Why is Dam-building such a controversial issue?
Water Wars in the Middle East Nile River Jordan basin Tigris & Euphrates
Water Wars in the Middle East http://news.bbc.co.uk/2/shared/spl/hi/world/03/world_f orum/water/html/river_nile.stm http://news.bbc.co.uk/2/shared/spl/hi/world/03/world_f orum/water/html/river_nile.stm
Define in your own words… Water Table Aquifer Recharge Watershed
Three Gorges Dam-China
Three Gorges Dam http://en.wikipedia.org/wiki/Three_Gorges_Dam http://en.wikipedia.org/wiki/Three_Gorges_Dam 2006 1987
Three Gorges Dam-China, 2009
How does non-point source contamination differ from point source contamination?
Point source vs. non- Point source contamination Define Point-sourceDefine non-Point-source Examples of Point- source Examples of non-Point source
What are some of the greatest challenges associated with our water supply? EnvironSci book p.293 - 298
What are some of the greatest challenges associated with our water supply? Access to Groundwater (Aquifers are recharged by Surface water) Transpiration (Cottonwood & Willow trees suck up and evaporate water) Competition for Use of water supply (agriculture, drinking water, septic system) Agriculture Nitrates & Phosphorous (from fertilizers) Urbanization (population growth in cities draws more groundwater)
Use a diagram to show the important role that Aquifers play in our water supply Where does the majority of YOUR drinking water come from?
Where is the majority of the freshwater on earth found?
Rain Shadow Effect Study the Hawaiian Island terrain maps with your group.Hawaiian Island terrain maps http://www.wrcc.dri.edu/precip.html http://www.wrcc.dri.edu/precip.html Then study the Avg Precipitation maps over the islands. Q. What patterns can you identify in regards to precipitation and terrain?