Rapid urbanisation of Dhaka in Bangladesh has led to over-abstraction of groundwater and shortages of drinking water. The US$1 billion ‘Dhaka environmentally sustainable water supply project’ aims to resolve this by providing raw water to the city from the Meghna River. The first construction package of a river intake, 22 km raw water pipeline and 500 Ml/day water treatment plant is due for completion in 2023, with three more packages currently under design. As of December 2020, two are bid and awaiting award, one will be tendered in the first quarter of 2021. Routing and constructing 100 km of pipelines up to 1.6 m in diameter through the city’s highly congested urban environment is proving extremely challenging, as is dealing with the geotechnical and seismic conditions and the need to cross major rivers while ensuring social and environmental safeguards. This paper describes how the challenges are being addressed in procuring and delivering a new sustainable water supply to a rapidly developing global megacity.

中文翻译：

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孟加拉国达卡可持续供水项目的设计和采购

孟加拉国达卡的快速城市化导致地下水过度抽取和饮用水短缺。耗资 10 亿美元的“达卡环境可持续供水项目”旨在通过从梅格纳河向该市提供原水来解决这一问题。河流取水口、22 公里原水管道和 500 毫升/日水处理厂的第一个施工包将于 2023 年完成，目前还有另外三个包正在设计中。截至 2020 年 12 月，有两条正在投标和等待中标，一条将在 2021 年第一季度招标。 事实证明，在城市高度拥挤的城市环境中布设和建造 100 公里直径达 1.6 m 的管道极具挑战性，处理岩土和地震条件以及穿越主要河流的需要，同时确保社会和环境保障也是如此。本文描述了如何解决在为快速发展的全球特大城市采购和提供新的可持续供水方面的挑战。