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Conclusion

The hypothesis that a sample of river water taken upstream is less polluted than a sample of river water taken downstream  is proven to be true.

Also consider

Try testing the quality of the water in lakes and ponds located at different distances from urbanized/densely populated areas.

References

Water pollution - http://en.wikipedia.org/wiki/Water_pollution

Common water measurements - http://ga.water.usgs.gov/edu/characteristics.html

Earth’s water- rivers and sediment - http://ga.water.usgs.gov/edu/earthriverssed.html
 

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Complexity level:
7
Project cost ($):
60
Time required:
1 day for preparation, 1 day for observation
Material availability:
You will require transportation to the various river locations
Safety concerns:

 Basic safety requirements