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The two main factors that determine the amount of power and energy you can attain from your hydropower site are the flow rate, or the amount  and the head. Learn how to measure them to estimate the amount of power available.
There are many different turbine options for a microhydro system. Determine which one is the best fit for your site.
Maintaining good water quality keeps the all the organisms that depend on the stream, including humans, healthy and safe. Several different indicators of water quality are explained here.