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Abstract: Musaimeer outfall tunnel is one of the longest storm water tunnels in the world with a total length of 10.2 km. The tunnel will accommodate surface and storm water received from the drainage networks from 270 km² of urban areas in southern Doha. The tunnel was excavated by Tunnel Boring Machine (TBM) and encountered three distinct rock masses Rus formation, Midra-Shale and Simsima Limestone...