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Weep Hole and Cut-off Effect in Decreasing of Uplift Pressure. (Case Study: Yusefkand Mahabad Diversion Dam) Original Article, B19 Azizi S, Salmasi F, Abbaspour A and Arvanaghi H. Journal. Civil Eng. Urban. 2(3): 102-107. 2012. ABSTRACT: In order to have economic designs to reduce uplift pressure in hydraulic structures like diversion dams and concrete gravity dams, so many methods have been proposed that the most important include construction of horizontal aprons/cutoff walls in upstream and downstream of the dam and weep holes in the downstream or proper place between the two cutoffs. The effect of weep holes and cutoff on uplift pressure is the main goal of this study. This study focuses on Yusufkand Mahabad diversion dam in IRAN, by simulation it in Seep/W software. Effect of weep holes location and different depth of the dam cutoff walls on uplift pressure and on exit hydraulic gradient is investigated. Results show that upstream cutoff with 8 meter depth decreases uplift force about 63% and decreases exit gradient 79% respect to without cutoff case. Installing weep hole in downstream stilling basin decreases uplift force 8% and decreases exit gradient 74% more than without weep hole. Based on this research, design of diversion dams can be carry out by minimizing concrete costs and hence become economical design. Keywords: Diversion dam, uplift pressure, exit hydraulic gradient, cutoff wall, weep hole. منبع: [Hidden Content] دانلود: [Hidden Content],%20B19,%20102-107,%202012.pdf JCEU, B19, 102-107, 2012.pdf