The project to launch the upgrading and expanding of the sewerage infrastructure in south Doha will be tendered towards the end of this year. Work is expected to begin in the first quarter of the next year.
The salient features of the massive project, “Inner Doha Re-sewerage Implementation Strategy (Idris)”, which is expected to cost about QR10bn, were unveiled yesterday by a team of consultants working with Qatar’s Public Works Authority (Asghal) at a gathering attended by engineering and technical professionals, contractors, consultants and bankers .
While explaining the “magnitude” of the project that extends upto Mesaieed, officials hoped it would meet the demands of the population growth of an additional 1mn residents in what they referred to as South Doha catchment.
It will be fully implemented in about seven to eight years, with the earliest commissioning dates set for sometime in the middle of 2019.
Once implemented, the project is expected to permanently solve the problem of sewage water flooding in parts of Doha city and the Industrial Area, participating engineers said.
While introducing the strategy, which is aimed at meeting the long-term requirements of the growing population of the southern side in a big way, drainage project department manager Nasser Ghaith al-Kuwari said that Ashghal had adopted a “strategic and comprehensive” approach to deliver some of the country’s largest infrastructure projects aimed at supporting its future socio-economic needs and Idris is one of them.
“Idris will overhaul South Doha’s existing networks’ capabilities and upgrade it significantly for decades to come,” he said.
The project’s highlights include a more than 70km long treated sewage effluent return mains, a deep terminal pump station of approximately 60m, advanced sewage treatment works with an initial capacity of 500mn liters per day, a conveyance system consisting of over 30km of deep main trunk sewerage and 70km of lateral interceptor sewers.
Lateral sewers, it was told, would be used to intercept the flows and to relieve existing overloaded system. The flows will be channelised by gravity to the terminal pump station through the main trunk sewer and then lifted to the new Doha South Sewage Treatment Works (STW) in Mesaieed Industrial City (MIC).
With initial projections indicating that the long-term foul sewage will range from 670mn to 1,100mn litres a day, the new plant will be built in phases to match actual growth in the catchment area. The initial phase to be built under the Idris will treat 500mn litres of effluent wastes a day with the site layout configured to accommodate additional phases that could eventually bring its total capacity to 1,200mn litres a day.
The new Terminal Pump Station (TPS) and Doha South Sewage Treatment Works (STW) will be constructed at the downstream end of the Idris conveyance system.
The TPS will be designed with a peak pumping capacity of approximately 12mn cubic metres/sec and conveyed to the New Doha South STW, with an initial capacity of upto 500mn litres per day (MLD), where it will be processed and reclaimed as treated sewage effluent for irrigation purposes.
Also speaking, Ambrose McGuire, of CH2M Hill, a global leader in programme management and engineering consulting, said that Idris had been conceived and developed as a major deep tunnel sewerage network and an advanced sewage treatment that would effectively return treated water for irrigation, mainly in the farms, spread over on the country’s western side.
CH2M Hill has been appointed as the programme consultant for the project to develop and oversee the implementation of Idris in a safe and sustainable manner, using some of the innovative approaches in similar projects in the UK, Singapore and Abu Dhabi.
The entire programme, being implemented after extensive studies and researches carried out by teams of acclaimed professionals, took an integrated approach whereby various influences on sewage flows were examined. They included projected community growth, existing conditions of the drainage system and a host of forthcoming developments such as Doha Expressway Motorway System and Qatar Rail’s Metro, works of which are underway.
Once the work is over, the project will help decommission more than 30 ageing pumping stations in the inner city areas of Doha and replace them with a single large deep terminal pump station, in the Mesaieed area.
It was also explained yesterday that owing to the significant depths of the tunnelling works below ground, Idris will utilise some high utility sub-surface techniques and it would help minimise the otherwise usual disruption associated with utility pipeline works.
Consultant Terry Krause and drainage maintenance manager at Ashghal John Drummie explained the important features of the project while taking part in an inter-active session held after its introduction.
Source: Caye Global News, Gulf Times
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