Soil erosion and sediment control is important in watersheds with planned dam construction. For an efficient implementation of watershed management practices, identification of critical areas is vital. Many studies have effort to identify and priority of critical sub-watersheds. But very limited studies have been conducted to rank sub-watersheds in terms of their sediment yield contribution at the watershed outlet. Therefore, the goal of this study is spatial priority of critical sources areas in Taleghan dam watershed based on three methods: (1) SSY-S: specific sediment yield at sub-watershed outlet (sediment yield/area), (2) SY-W: sub-watershed contribution to the sediment yield of the main watershed outlet/Reservoir, and (3) SSY-W: specific sediment yield contribution of sub-watershed to the main watershed outlet/Reservoir. The results of sub-watersheds prioritization showed that sub-watershed 22 has the highest sediment yield at their own sub-watershed outlet and main outlet of watershed. Also, implement conservation practices, at high priority area show decreasing in sediment yield at watershed outlet. However, sediment yield at outlet of watershed decreased about 11%, 15% and 17% from baseline scenario in methods 1, 2 and 3, respectively. The results show that the SSY-W method was more effective at reducing sediments entering Reservoir of Taleghan dam.
- best management practices
- hydrologic model
- integrated watershed management
- sediment yield control
- spatial prioritization
- First received 8 October 2015.
- Accepted in revised form 21 March 2016.
- © IWA Publishing 2016