May 22, 2012• Students will be able to analyze a watershed model in order to explain how human activities impact the quality of a watershed ecosystem.• Drill: Why should we “Save the Bay”? Give a few reasons why you believe we should protect the Chesapeake Bay?• Homework: Final Exam Review Packet due Thursday.• Final Exam: Tuesday, May 29, 2012
DEFINITION OF A WATERSHED• Any body of land that flows downhill into a waterway.• It is all the land area that drains to a specific point
Subwatershed• A drainage area within a watershed.
Chesapeake Bay Watershed • Covers almost 65,000 square miles • Includes parts of New York, Pennsylvania, Maryland, Virginia, Delaware, and West Virginia
The number ofpeople in theChesapeake Baywatershed isexpected to exceed17 million.
Impervious Surfaces• Surface that cannot infiltrate rainfall, resulting in runoff
Increased impervious surface creates more runoff… and more water pollution!
Point Sources of Pollution• Comes from a specific, identifiable source, such as pipe, tank, pit, ditch or channel to a body of water. The bulk of point source pollution comes from wastewater discharge from power plants or large industrial plants.
• This ends day one of the Chesapeake Watershed Model lesson.
Nonpoint Sources of Pollution• Comes from a diffuse source rather than one specific• Storm water run offs from large land areas which may contaminate the surface and ground water over a large area.