http://www.youtube.com/watch?v=HnxbTKUEIAI

grabcad

An Archimedes screw anybody with a welding machine and access to a circular bender can build, basically is a continuous screw obtained from metal strip large 200 mm with an inner tube of 250 mm, intubated in a pipe that is longitudinally sectioned to allow the extra water in case of flood to go somewhere without going on the power generators (that are expensive to replace) the generators case it is also the upper bearing support, and can host a large wheel that acts as a pulley, and up to two generators of 3 Kwh each, according to your water volume and speed (level difference) you might wanna use more or less generation capacity. This screw can work with inclinations between 15 degrees from horizontal up to 75 degrees from horizontal, but works best in between 27 and 50 degrees from horizontal. In this rar archive there is the Inventor 2012 components (.ipt) and assemble (.iam), plus some other formats like .IGS, .SAT, DWG, DWF, 3D Max, 3 D Tools, 3 D PDF .WRL, Catia V5 easily open-able with various programs. Easy to build and to install, could power one or two houses, or provide street lights for a whole small village.