Take the water bottle with “rain” (water with blue food coloring) and spray your landscape 15 -20 times
Now take the spray bottle with “fertilizer” (water with green food coloring) and spray 3 times sharply in different locations
Spray the water with red food coloring to symbolize oil and residue from cars and trucks
Put a large drop of red food coloring to symbolize an oil spill
Add blue food coloring to the red spray bottle and spray 3 times with purple to symbolize harmful chemicals used by farmers and industrials to control pests, weeds, and insects
Add 15-20 more sprays of "rain"
Observe how the water shed has been affected
Points to Emphasize and Discuss
What is a watershed and how does the model represent one?
How did pollution affect the watershed?
What did your "ocean" at the bottom of the tinfoil landscape look like?
What are point and non-point source pollutants and what colors represented each?