Sam Redfield developed this design to provide a source of electricity that can be built cheap and hooked up to any source of flowing water – including irrigation systems, creeks and streams, or even sewage systems. (as stated by 5 Gallon Ideas Article)
Click here to view – look towards the 2nd paragraph for the clickable link to download the 35 Page Design Manual for free:
http://fivegallonideas.com/hydroelectric-generator/