A big watermill-type wheel, alot of copper wire, A BIG magnet, and some fixtures
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Speaking from experience you will be amazed at the ideas you'll mine from Google on this subject- some one out there has experimented with just your situation. (I was over-whelmed by the number of different ideas folks have tried with hydro-electric)
. The two main parameters you need are head and flow. If you understand electricity, analogous to voltage and current, respectively. That will give you an idea of how much power you can generate. From there you can decide if it's worth spending the time and money to build and operate. . As lemonie points out, you may not be able to make any modifications to the creek.
Like L says, the design depends a lot on the head. The best kind of high pressure, low flow turbine won't suit a low head stream and vice versa.
How much head of water do you have and how much ability do you have to interfere with / modify it (including digging, concrete, brickwork, shuttering etc)? L