Quantitative and Qualitative Evaluation of the Effect of Watershed Management Operations on Decreasing Soil Erosion and Sediment Yield (Case Study: Berenjestanak dam Watershed)

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.