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Any free micro-hydro plans out there?

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Location: Oregon (zone 7b), 31.3 inches/yr rainfall
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I have 3 sights I'm interested in trying to build my own hydro system. I have two different irrigation ditches that have significant drops onto/through our property and a small stream (not much head). Anyone have links to websites or pdfs that have FULL plans or show how to fabricate turbines or full systems? I'd love if enough people could provide a few to look through. I've tried searching online, but I keep ending up on sites where they want me to pay for the pdf.
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They're not full plans, but the following might give enough clues or hints to get you going.

Home Power has a series of articles that about what hydro power is.

The Green Optimistic has an article that demonstrates the general concept of building a microhydro device.

Practical Action has various brochures discussing micro-hydro power.

These are probably the most helpful links:
On Instructables, a user made a micro-hydro device from CDs and another user made a a larger microhydro system.

The general idea behind microhydro is to take running water, transfer that energy into mechanical energy (spinning of the turbine), and then transfer the mechanical energy into something you find more useful, like electricity. And electricity isn't too hard, wrap copper wire around a magnet and you're pretty much ready to go.And if you want to go in reverse, just apply electricity to a magnet and copper setup.
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