The main scope of work involves dewatering of an excavation for a quaywall construction. The total length of the quay wall is approximately 1.45kms and approximately 50m wide with a depth of up to 7.5m from existing ground level. The excavation side support is by a battered slope. The excavation and dewatering works are divided into four areas.
The sea is approximately 50m to 100m away from one side of the excavation. All the construction works must be carried out in dry and safe conditions; deep well dewatering systems have been utilized to achieve this goal. Table 1 below, summarizes the areas and scale of the structures, which required dewatering.
The NMDC (National Marine Dredging Company) Reem Hills Construction of Quay Wall project is part of a larger development initiative in Abu Dhabi, aimed at enhancing the infrastructure of the Reem Island area, particularly within the Reem Hills development. The total length of the quay wall is approximately 1.45kms and approximately 50m wide with a depth of up to 7.5m from existing ground level.
The main goal of this project is to build a quay wall, a crucial structure for waterfront developments, providing a stable boundary between the land and water. The quay wall will serve both functional and aesthetic purposes, enabling the development of residential, commercial, and recreational spaces along the waterfront.
WJ carried out analytical calculations and numerical groundwater modeling with sensitivity analysis to design the dewatering system. This provided both WJ and the client with confidence in the design and assessments that the drawdown can be achieved for the project. This proved very useful when aligning the system performance with the parallel site activities such as excavation and allowed the system capacity to be determined with a clear understanding of the anticipated performance and the available redundancy of the system. After completion of the deepwell dewatering system installation, WJ conducted a dewatering test on the first few initial deepwells drilled and installed. The deepwell system was closely monitored and the site drawdown was achieved.
It is proposed to install 124 deepwells, each approximately 17m deep to give a dry platform at the required excavation level. The system will be supplied complete with submersible pumps, with standby units, power supply system, control panels with suitable alarm system and 24hr on site monitoring team.
The scope summary, although impressive, hardly does project justice. A dedicated site team of engineers and technicians have been operating up to 124 deepwells, multiple generators and other equipment on a 24/7 basis. The work also included the management of a discharge network in excess of 4kms spread across the site. The dewatering has a combined system flow rate of over 220 l/s. Since dewatering is a critical path item, it was essential that visibility of the system performance was maintained at all times and shared across the project stakeholders.
WJ have completed many projects in Middle East and globally. Click on the links below to learn more about what we do.
Are you ready to see what else our vision can bring to your projects? Speak to our team of groundwater experts today!
