Abstract：In order to study the effect of rough-strip energy dissipator(R-SED)on flow diversion of wide and shallow bends, and to achieve the formulation of R-SED parameters and to improve its applicability, based on the principle of dimensional analysis and 18 sets of orthogonal experiments, a semi-theoretical and semi-empirical formula for R-SED height was established. Each coefficient in the formula was calibrated by combining the orthogonal experimental results. A multiple regression analysis on the formula was performed against the orthogonal experimental results. The formula was compared and validated with the prototype data of the Xinjiang ″635″ spillway renovation project. Moreover, a more intuitive water flux discrete coefficient Cm was introduced to serve as a new type of flow diversion evaluation index. The results show that the Reynolds number Re has little effect on the height of R-SED. If the effect of Re is ignored, the predicted R-SED heights with the formula are basically consistent with the prototype data. The average relative error between them is 7.77% only, hence Cm can reflect the diversion effect of R-SED objectively. Since each parameter has real physical meaning during derivation of the formula, Cm has universality in terms of the methods for evaluating the diversion effect of general rectification engineering.