Geoelectrical Detection of Subsurface Channel at the downstream side of Mosul dam

Abstract

The causes of formation and continuous growth of several sinkholes ¬within ¬the ¬service building areas of Mosul dam have been investigated using electrical resistivity method. The survey was ¬conducted on the downstream -side¬ of the ¬western ¬part ¬of Mosul dam area and it ¬¬was successful ¬in ¬detecting ¬and ¬delineating subsurface flowing water (channel). The calculated width of the channel ¬is about 240m lying at a depth of about 10m. The channel probably¬ has ¬its intake from the main reservoir and then flow behind ¬the ¬western ¬end ¬of ¬the ¬dam body to discharge at the downstream side forming many sinkholes in the area.