This study is aimed at development of the extra-low head water turbine for an open channel from a viewpoint of using effectively unused hydropower energies, such as an irrigation channel. Then, paying attention to the cross-flow runner, authors eliminated the casing and tried the application as a water turbine for an open channel. In this paper, water turbine performance, the flow situation characteristics, and the flow in the runner were experimentally investigated about effect on the shape of water turbine. The results showed that an output and turbine efficiency of straight blade is better than curved blade.
