This review summarized recent experimental studies by the hydraulic observations and measurements in small natural channel streams, such as tiny rivers, irrigation and drainage canals. Three modern topics were selected in river hydraulic engineering: (1) gravel-cobble bed flows, (2) flows with vegetation zones, and (3) flows around spur dyke visualizations and measurements: flow velocity, flow lateral spreading, and water-surface and bed-surface levels. In conclusion, it was suggested that hydraulic experiments in small natural channel streams have a possibility to provide This review summarized recent experimental studies by the hydraulic observations and measurements in small series. Discussion was extensively developed from various viewpoints, using many field data obtained by flow effective information in future river hydraulic engineering research.
