ارزیابی کمی و کیفی اثر عملیات آبخیزداری برکاهش میزان فرسایش و رسوب دهی(مطالعه موردی:حوزه آبخیز سدبرنجستانک شهر قائم شهر)

Watershed management operations are works in order to optimum using from drainage basin Sourcs  or conservation and remediation of natural sources. If operation of this projects elevting from several aspect pf technical and engineering  the production result maybe help us to find  the reason  of advantage and  disadvantage of suggestive operation  and showing us suitable solutions  in the way  of obviating  them. In this paper  to take necessary  action of  Watershed management  activity as  introduction of Gabion check-dam and  break weir in  drainage basin of upside of  Berenjestanak dam (Mazandaran province), is something has studied .For researching  about the  effect of instructed check dams  on scale of sediment control  and becomes  we don’t have information about  Hydrometric station in  quantitative method we  used EPM tentative method .The result showed decrees of sediment after  the operation. In addition, check dams can be control about 1.8% from Berenjestanak dam reservoir. After quality evaluation of watershed  management model that administrated in zone  on observation and complete  instance table lists by supervisor, the last point  of  evaluation of this project  is 79.5  that’s best function of this project. So the last result tell us observing problem of specially in introduction of corrected  structures in zone decrease natural slope of waterway and changes. That to limited slope,entraps of sediment and decrease useful ago of  Berenjestanak dam and also reduces the speed of runoff and finally  decrease of erosion.