Assessment water leakage zones of Minab Esteghlal dam

The Minab (Esteghlal) dam site is located in east of Minab city in Hormozgan province and in the vicinity of active fault of Minab. Joint studies in the ten stations on the rocks masses around the reservoir of dam demonstrations the four main joint sets. For assessment of this idea، the permeability of rock masses outcrops in the reservoir is estimated by HC experimental model. For this، the RQD، GSI and other characteristics of discontinuities in rocky outcrops in dam reservoir are measured in field studies. The results show that the permeability of left and rock dam embankments change from 9. 14 × 10-6 up to 2. 02 × 10-5 m/s. Also the water lost for three different condition of minimum، mean and maximum level of water table are 0. 14، 0. 20 and 0. 29 m3/s. The results indicate that the discontinuities with trend of east – west and northeast – southwest and also shear fault zone of Minab have main effects in leakage of reservoir