What is the best way to calculate the delta of a Control vs a Impact condition? In my study I have many rivers restored that are compared to a temporal or spatial unrestored condition. I would like to observe patterns of change between restored vs unrestored rivers over time, For this reason I thought to calculate the effect as DELTA. What do you think is the best way to calculate this?
1- Control - Impact
2- (Control-Impact)/Control
Is there a substantial difference?
Thanks for your consideration
Alessandro
Although not always available, best to use a stable, natural system as the control within the same physiographic area. There are a variety of ways to compare streams when valley and stream types are similar. If you are not familiar with the stream classification and restoration work of Dave Rosgen, he has many digital references at www.wildlandhydrology.com. There are many activities and actions that individuals may include in the restoration umbrella, some effective, some not. Some dealing with water quality, some stream morphology and stability, some just treating local severe problems, some addressing aquatic habitat, etc., so it may not be easy to address your goal in a comprehensive analysis, but single out some specific interests.
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