Hi Hilary,
Welcome to ETS. There are many forum members here, some of which may well be able to help you out better than I.
You might try doing an internet search using words like "water storage ponds" "fish ponds" "water power generation" and see where that leads you. There is a bunch of information available that will help point you in the right direction.
As far as your other question, a similar search using words like "survivalism" will likely provide information your looking for as well. Heads up, some of the survivalism sites can be rather full of religious / political / outcast posturing and related vehemence. Tread lightly and take it all with a rather large "grain of salt". I'm not implying that they are all bad and/or that some of the information is not good, just that many the sites I've come across generally not as polite and courteous as Equipped is. I was surprised to see how much "flame-baiting" and "trolling" existed on some of them and felt that it was a sad thing that some of the good information quickly got buried in the vocal infighting.
Be safe,
Comanche7