Equal width problem is researched currently for Stilling basin with upstream slope.U.S.Army Corps of Engineers has given classical hydraulic calculation method which are not suitable to stilling basin with upstream diffusion slope.Also.It has been applied in water control project,configuration problem of which is solved by hydraulic model test.This paper established a hydraulic calculation method for stilling basin with upstream diffusion slope which was verified by model test data of two stilling basins in...