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The acidity of the downstream water samples is higher than that of the upstream water samples . The turbidity , ammonia content and nitrate content of the downstream water samples  is also higher.

Water samples Tests done on water samples (Averages for each sample type)
  Acidity (pH) Turbidity (NTU) Ammonia (ppm) Nitrate (ppm)
Upstream 7.2 1.5 1.2 1.5
Downstream 5.6 7.8 5.6 9.3

Plot your results into a graph as shown below.  

river water quality science fair project

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Complexity level:
Project cost ($):
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