Typical en:micro_hydro setup. In this microhydropower system, water is diverted into the penstock. Some generators can be placed directly into the stream.
This  <a href="https://en.wikipedia.org/wiki/Vector_images" class="extiw" title="w:Vector images">vector image</a> was created with <a href="https://en.wikipedia.org/wiki/Inkscape" class="extiw" title="w:Inkscape">Inkscape</a> .
<p><a href="//commons.wikimedia.org/wiki/File:Microhydro_System.svg" title="File:Microhydro System.svg">File:Microhydro_System.svg</a> <a rel="nofollow" class="external text" href="http://www.energysavers.gov/your_home/electricity/index.cfm/mytopic=11060">DOE's Office of Energy Efficiency and Renewable Energy</a>
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Image at <a rel="nofollow" class="external free" href="https://www.energy.gov/energysaver/buying-and-making-electricity/microhydropower-systems">https://www.energy.gov/energysaver/buying-and-making-electricity/microhydropower-systems</a> (2018-06-29) DOE's Office of Energy Efficiency and Renewable Energy