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Tunnel complete for Qatar groundwater drainage scheme

The Public Works Authority of Qatar (Ashghal) has announced that excavation works for the main tunnel of the Mesaimeer Surface and Ground Water Drainage Project are complete.

The completion of the 10km-long main tunnel marks the end of the major works for the Mesaimeer project, part of Ashghal’s plans to upgrade Qatar’s drainage network.

The project will discharge groundwater and stormwater into the sea, thus decreasing surface water level. As a result, this will help reduce pumping costs and the disposal of groundwater in construction projects around the country.

The Mesaimeer tunnel was excavated using earth pressure balance (EPB) tunnelling technology, which is suitable for Doha’s cohesive soft ground and rock conditions.

The excavation works were undertaken at a depth of 30m and were carried out by two tunnel boring machines (TBMs) called Al Thumama and Al Rawada, named after the areas in which they operated.

The main tunnel is linked to a pumping station with a capacity of 19m3 per second, which will discharge the collected stormwater from the tunnel through an offshore outfall several kilometres away from the shoreline.

The Mesaimeer project is expected to be completed in Q1 of 2017.

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