Evaluation of Quantitative Impact of Watershed Management Projects on Underground water Level (Case Study: Jamab Project)

Performance and control are two important components in any executive activity and their purposes are to correct and improve the functions and reduce wasting resources for better productivity and adoption of appropriate techniques that ultimately lead to the development of programs. Therefore, the present study aimed to simulate underground water flow and investigate the effects of artificial water supply projects on the underground water resources of Frizi plain in Chenaran using a mathematical model and MODFLOW code. The studied aquifer model is the most sensitive to changes in hydraulic conductivity and discharge of wells and shows less sensitivity to changes in surface water supply due to rainfall. The artificial water supply scheme of Jamab in the control scenario had caused an annual increase of 453717.6 meters2 of water to the aquifer. The maximum volume of water entering the aquifer system through the artificial water supply of Jamab in 1995-2012 was equal to 1.8 million cubic meters, and according to the control scenario had increased by 1.35 million cubic meters, this amount of supply had increased the average of the water level of the aquifer of Frizi plain compared to the control scenario in the forecast period in 2014, 2015, and 2016 by 0.09, 0.11 and 0.17 m, respectively. The minimum volume of water entering the aquifer through the artificial supply of Jamab in 1995-2012 was in 1995 and 2002, which was approximately equal to 170 thousand cubic meters, which compared to the control scenario had decreased by 283 thousand cubic meters, the estimated revenue in the system obtained during the operation period until 2012 and was equal to 57.5 billion tomans. The profit to cost ratio of the project in terms of all revenues from project ecosystem functions and production was about eleven, which showed that the project was profitable until 2012.