Depending on where you live, there may be a lot of government sponsored guidance on how best to manage the environmental impact of micro hydro schemes - see e.g

Depending on where you live, there may be a lot of government sponsored guidance on how best to manage the environmental impact of micro hydro schemes - see e.g. https://www.gov.scot/publications/hydro-schemes-planning-advice/ https://www.gov.scot/publications/hydro-schemes-planning-adv... .