Initial tests using a garden hose were carried out today with great success, I estimated the turbines were going approx 100 rpm with no load (any equipment, including an alternator). The hose water was concentrated in the center of the vanes, so I am happy with the result. The river has considerably more power and the water will be spread over the area of each vane. Things are looking positive so far. Electrical systems are now the priority: alternator, controller etc.