Micro-Hydro on a river?

Hello folks! Good to be here tonight.
I'll be spending the next few years on a small property next to a river in Quebec.
The river looks like that: http://1.bp.blogspot.com/-bjUwUdqfq_4/Tby_zDogTzI/AAAAAAAAACU/vhgsQGvo9CM/s1600/P4290016+%2528FILEminimizer%2529.JPG (not that actual picture, but pretty similar.) Debit is roughly 30m3/s.
I'm wondering how I can
I'll be making a living off CSA vegetable/spin farming, so I'm all open for ideas on how that running water could be put to good use, without heavy expenses. Awesome projects on the way..
Have a great evening
Charles