Just saw something that might be interesting to include somewhere in our design. Check out the link
http://worldlandscapearchitect.com/seeds-of-change-bristol-uk-gitta-gschwendtner-maria-thereza-alves/#.UIk64cXNaSo
They use a solar panel to power a pump which uses river water as irrigation. If we used plants that are known to cleanse the water it could be a floating filtration system...
I think these look fantastic and definitely something which we should consider, especially around the residential area you proposed which would have the river tributaries.
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