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I(li)su Dam and Hydroelectric Power Plant (HEPP) are under construction on the Tigris River on the south east of the Turkey.During the construction stage, Tigris River has been diverted by 3 concrete-lined diversion tunnels each having a diameter of DT1 =DT2 =DT3 =12 m and the lengths of L1 =1064 m, L2 =1016.1 m and L3=915.3 m.