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It is important to know the available head between the average water level in "the large chamber" and the "settlement lagoon". You wrote the "water is sent then..." does is mean this is gravity flow? no pumping from the chamber to the settlement? If it is gravity flow then you can roughly estimate the available potential with the formula: P(kW) = Q (m3/s) x h (m) x 7; meaning you multiply the flow in the pipe (... m3/s) with the available difference in level (between chamber and settlement) and then multiply it with 7 which is a figure that considers all kind of losses (pipe losses, turbine efficiency, generator efficiency etc.). More detailed inform on using hydropower in existing infrastructure you can also find in the short flyer: https://www.skat.ch/activities/prarticle.2012-02-06.1394456265/prarticleblockfile.2015-07-15.5324829608/file and more comprehensive information you find in the the following article: www.skat.ch/activities/prarticle.2012-02-06.1394456265/prarticleblockfile.2015-06-04.7422381703/file If you need further support, please don't hesitate to write me an e-mail (hedi dot feibel at skat dot ch)