Document Type : Research Paper
Authors
1 MSc, Faculty of Range land and Watershed Management, Gorgan University of Agricultural Sciences and Natural Resources, Iran
2 Associate Professor, Faculty of Range land and Watershed Management, Gorgan University of Agricultural Sciences and Natural Resources, Iran
3 PhD Student, Department of Irrigation and Reclamation Engineering, University of Tehran, Iran
Abstract
The aim of this study was to evaluate the effects of mechanical watershed management measures implemented across the Boostan Dam Watershed on reduction of flood peak. To this end, the Watershed Modeling System (WMS) was used to compare peak flow before and after of implementation of the measures. The mechanical measures have been implemented during 2000–2007. The major soil and water conservation measures in the Boostan Dam Watershed were mechanical and biological measures implemented in a limited area. To determine the effect of these measures, the watershed has been modeled in WMS environment. Five flood events occurred before implementation of the measures were used for calibration and validation of the model. Three other flood events occurred after completion of the measures were then used for the evaluation. The results showed that the mechanical measures, despite the fact that their reservoirs are full of sediment, decrease the average peak flow 1.79 % compared to the absence of these measures and if some structures would not be destructed, the reduction would reach 5.95 percent. It should be noted that if the structures were out of sediment, the average peak flow rate would decrease 3.25 % in comparison with current situation and 7.64 % when compared to absence of structures.
Keywords
)