Evaluation of Muskingum and Modified Att-Kin Methods Efficiency in Flood Routing (Case Study: Talar Watershed, Mazandaran Province)

Predicting flood height changes in reservoirs and rivers is done by routing. one can also estimate the maximum amount of the flood in a moment regarding to the size of the flood through the dam and flow rate reduction down the river and according to it and also the degree of importance of installations downstream، preventive actions can be identified. Reviewing the flood routing is possible in two ways called hydraulic and hydrologic. Hydrologic method is less precise in compare to the hydraulic one، but hydrologic method can simply be applied and has reasonable results. These characteristics cause to use the hydrologic method for different purposes like flood control، flood zoning، structure design. In this study we used some hydrological methods like Modified Att-Kin method and Muskingum for routing in a part of watershed forum located in Mazandaran province between Pol-Sefid and Shirgah. In our study Muskingum with RMSE=0. 559 and =0. 9 was more efficient than Att-Kin method.