Reply #12: It might be preferable to go with the smaller version

[phantom power]

Construct artificial reservoirs. Forget anything living in them, and keep them as small as possible.

I say this, from the point of view that I disapprove of damming up rivers. The total impact of an artifical reservoir, that is much smaller, might be an improvement over damming up a river. Things might live in a dammed river, but that would be at the expense of disrupting an existing riparian ecosystem.

Then, there is the compressed-air strategy...