Abstract
The aim of this study is to estimate of durability of environmentally friendly nano-hydraulic turbines. Three type turbines
and a newly developed generator were tested in small gullies. All runners are open type which has minimal facilities for
cheaper generation and less environmental disruptions. As a result, it was found that the bearing failures and troubles of
overdrive units caused frequently. In addition, the direct coupled generator is useful for stable generation and improvement
of runner performance.
