Great way to plant potatoes in a small location. This is how it is done in Japan! Make a potato pot by cutting out the sides of a plant pot and putting it inside another one - this makes it easier to lift the plants out for harvesting.
How to make "pico-hydroelectric" power - doesn't require a lot of water and generates enough power for at least one household. I was thinking something like this in-line with your water inlet system since it is already under pressure.