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Maltese tunnel contract up for grabs

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Malta’s Water Services Company (WSC) is looking for contractors to tender for the construction of a 9km tunnel.

Part of the Water Services Corporation ‘Net Zero Impact Utility’ project, the tender covers the drilling, construction, pipelaying and completion of a 9km, 3m wide tunnel between Ta’ Qali Reservoirs and a Pembroke reverse osmosis plant.

When completed, the system will be capable of transferring 52,000m³ per day of desalinated water from Pembroke directly to Ta` Qali Group of Reservoirs through a 1.2m diameter pipeline where it will then be blended with groundwater.

A control system will monitor the blended water and control the dosing quantities at Pembroke reverse osmosis plant to ensure the optimum dosing quantities and therefore reducing the use of chemicals.

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ta qali reservoir 1024x576

Ta’ Qali group of reservoirs

From the Ta’ Qali group of reservoirs, the water will be fed through a new gravity system that will feed the east areas of Malta. Another transfer line will feed the Misrah Lewza Reservoirs in San Gwann via a separate pipeline from Ta` Qali.

WSC CEO Richard Bilocca said: “This challenging project will revolutionise the way potable water is distributed and blended, resulting in improved quality across the Maltese Islands. The system will also reduce operational costs and increase security of supply since most areas will be fed without the use of pumps resulting in better energy performance and continuity of supply even during power failures.”

When operational, the project will improve the overall water quality of the Maltese Islands and drastically improve operational efficiency and environmental sustainability.

The project is phased in three separate lots which will be implemented simultaneously. The work is expected to take 30 months.

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