Investigation the Effect of Different Parameters in Earth Dam Foundation Seepage Using Seep/W Model (Case Study: Doroodzan Dam)

Controlling seepage from earth dams foundation and calculation of its valve is so important for monitoring and stability control of earth dam. Doroodzan is an earth-rock dam which is located on North-west of Kor River. In this study simulating, calibrating and validation of numerical model of Doroodzan dam were conducted in seep/w software using result of monitoring report. Then changes of foundation seepage flow of Doroodzan calibrated earth dam model were studied changing Foundation seepage control method (consisted in using clayey blanket and cut off wall) and parameters of each method (such as blanket length and cut off height and location) and changing the geometry and hydraulic parameters (such as foundation permeability and reservoir water level). Results showed that increase in blanket length and using cut off wall at the first and middle of dam, decreases foundation seepage flow. In addition simulate using blanket and cut off wall had the most effect on decrease in foundation seepage flow. Finally a regression equation due to determine earth dam foundation seepage was developed using Spss software. Comparison of the accuracy of the proposed equation results with previously presented equations showed that estimated foundation seepage discharge using proposed equation has higher accuracy.