Economic Survey of Underground dam (Case Study: Millsefid Watershed)

According to dry conditions, low rainfall and high evaporation in Yazd province, surface water storage is not technically and financially feasible. Therefore, the use of underground dams in areas where there is appropriate underground water storage is a reliable and economic way. In this study, underground dam (rock and concrete) constructed in Ardakan (Millsefid watershed), with the aim of developing a new water supply for agricultural needs of the region and Khranaq village (located in the downstream of the area) was evaluated in terms of economic. 887765630 rials was calculated as the total cost of the dam. Benefits of the plan (for 42 m3 per day in base year( was calculated 214.62 million rials. According to 50-years design life, the Benefit/Cost index, for the first 5 years of operation, was calculated. This represents that in the fifth year of the project, the cost is depreciated and the project has economic feasibility. The per m3 water price, produced during the life of the dam is 1158 rials, comparing to today's water price (14,000 rials) is very economic. Impact factor of the dam wall was achieved 12.67 that is justified, with geological and geomorphological constraints and water requirement of the area.