Investigation and Assessment of Environmental Flow by Hydrological Method (Case Study: Shadegan Wetland)

As a cansequence of Marun dam construction on the Jarrahi River, qualitative and quantitative changes of inflow is an ecological threat on wetland ecosystem. In order to prevent the long- term negative impact of the projects on the ecosystem, it is necessary to assess the environmental flow and optimum water allocation for different uses. In this research, environmental flow indices were investigated using hydrological analysis of wetland inflow at Jarrahi River. Environmental flow estimated in Shadegan wetland are 6.83, 1.54 and 3.18 m on Montana method, environmental flow is estimated 1.54 and 3.6 m respectively. The results have shown that environmental flow indices were decreased after dam construction in all hydrometric stations. 3/s based on duration curve, Aqua France law and Smakhtin methods, respectively. Base 3/s in first and second part of year.