1. 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

2. WATERSHEDS

3. 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

4. Subwatershed
• A drainage area within a watershed.

5. Chesapeake Bay Watershed
• Covers almost
65,000 square
miles
• Includes parts of
New York,
Pennsylvania,
Maryland, Virginia,
Delaware, and
West Virginia

7. The number of
people in the
Chesapeake Bay
watershed is
expected to exceed
17 million.

9. Impervious Surfaces
• Surface that cannot infiltrate rainfall,
resulting in runoff

10. Increased impervious surface
creates more runoff…
and more water pollution!

11. 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.

12. • This ends day one of the Chesapeake
Watershed Model lesson.

13. 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.