How is stream health measured?

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The health of a stream can be measured in three different ways including: 

The health of a stream can be measured in three different ways including: 

1) Biological: measures the types and quantities of fish and aquatic insects

2)  Chemical: measures the types and quantities of chemicals in the water such as pH, conductivity, water temperature and dissolved oxygen

3) Physical: Measures the measurement of changes in the shape of the stream