Abstract
Water levels and discharges have been considered to be essential for planning, design and management of rivers. Developments of flood observation instruments, advancement of flood analyses and changes in social and economic environments have brought changes in views and measures for flood controls.
In the present paper, first, points of views up to now regarding the flood water level and discharge are outlined. Second, a new analysis method using observed water surface profiles is presented and using this analysis method, appropriate control and share of flood discharges for maintenance and management of rivers and adaptation against global warming become possible by means of dikes and dams. Lastly, new physical interpretations of flood hydraulics and significance of river management are demonstrated by applying the analysis method to the Kinu river flood of 2015.
