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A 1D and 2D resistivity surveys were carried out over the area of Chame Rezan dam site which is located about 33 km to the Northwest Sulaimaniyah City, NE Iraq. Schlumberger array were conducted in 34 locations with AB/2 spacing equal to 200m, as well as two representative Winner-Schlumberger profiles were laid out with electrode spacing equal to 5 m. The study concluded that the combination of 1D and 2D resistivity surveys is successful in identifying and producing a complete high-resolution image of the subsurface. The results were obtained show excellent correlation with the several bore holes were drilled on the recommendation of the surveys. The depths obtained by interpretation of 1D sounding points is slightly smaller than the actual depths recorded from the boreholes at the location of both dam abutments where the dip of the beds is ranging from 40 to 70 degrees. Consequently more reliable depths are obtained in the same locations from 2D resistivity profiles as well as the range of resistivities and lateral changes were obtained by 2D tomography are most reliable. In addition, the study reveals to the existence of a recent sediments has thickness ranging from 7 to 25 m overlain a low resistive Kolosh Formation.

Geophysical study of the Chame - Rezan Dam Site, Sulaimaniyah City, NE IRAQ