Case Study: Dewatering Operations for Stormwater Line Installation, Abu Dhabi

Delivering successful dewatering operations for stormwater line installation at Yas Bay Beach, Abu Dhabi, required far more than simply removing water from an excavation. The newly reclaimed coastal environment combined high groundwater tables, permeable soils, and direct hydraulic connectivity to the sea, creating continuous and unpredictable inflow pressure that conventional pumping systems often struggle to manage.

Building and construction environments frequently involve unpredictable groundwater behaviour and unstable soil conditions, making effective dewatering critical to maintaining safe excavation and programme continuity.

To overcome these challenges, Khansaheb Sykes engineered a fully integrated dewatering system capable of maintaining stable excavation conditions under sustained groundwater pressure while responding rapidly to sudden inflow events caused by tidal and subsurface conditions.

Why Coastal Dewatering Is More Complex Than Standard Excavation Support

Traditional dewatering methods are often insufficient in coastal or reclaimed land environments. In these locations, water movement is rarely static. Instead, our engineers usually face constantly changing conditions influenced by groundwater pressure, soil permeability, and hydraulic interaction with nearby marine sources.

Key challenges

• Direct hydraulic connectivity to the sea, allowing unrestricted groundwater inflow
• Elevated groundwater levels require continuous drawdown
• Highly permeable silty soils that accelerate lateral water migration
• Increased risk of trench instability and restricted site access
• Programme delays caused by flooding or uncontrolled inflow

These factors create a construction environment where successful coastal dewatering relies on more than simply deploying temporary pumps.

Maintaining Excavation Stability in Marine Environments

Selecting the correct combination of industrial pumps, deep well systems, and supporting power infrastructure is essential in high-risk dewatering environments. Khansaheb Sykes implemented a fully integrated strategy that combined system capacity with operational flexibility to maintain stable excavation conditions while adapting in real time to changing site pressures.

The dewatering system included:

• 5 × GP200M pumps providing high-volume inflow control
• 7 × GP150M pumps delivering distributed trench dewatering
• Borehole pumps maintaining groundwater drawdown
• 200kVA generators ensuring an uninterrupted power supply

GP150M General Purpose Pump

GP 150M General Purpose Pump incorporates the unique Sykes Univac vacuum system, which enables the priming and re-priming to be fully automatic from dry.

Max head: 38 m

Max flow: 90 l/s

Max solid: 52 mm

View all specifications

GP200M General Purpose Pump

GP 200M General Purpose Pump, specifically designed for arduous applications and incorporates the unique Khansaheb Sykes Univac vacuum system.

Max head: 36 m

Max flow: 138 l/s

Max solid: 75 mm

Full details

Immediately after deployment, the engineered dewatering system mitigated operational risk by adapting in real time to changing site conditions throughout the project.

At Yas Bay Beach, maintaining consistent control over water levels allowed construction to proceed without interruption, despite challenging marine conditions. The engineering approach required to manage groundwater in reclaimed coastal land is further demonstrated in our Ramhan Island Dewatering case study.

Delivering Reliable Dewatering in Challenging Conditions

The responsive dewatering strategy maintained stable excavation conditions throughout the project, despite continuous groundwater pressure and challenging coastal conditions. By combining high-capacity pumping equipment with real-time operational flexibility, Khansaheb Sykes reduced operational risk and ensured construction activities progressed safely and without interruption.

The integrated system delivered sustained site access, eliminated unplanned flooding and downtime, and maintained reliable equipment performance under continuous operation. This project further demonstrates Khansaheb Sykes’ expertise in delivering engineered dewatering solutions for complex, high-risk infrastructure and coastal developments.

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	Download Case Study: Dewatering Operations for Stormwater Line Installation at Yas Bay Beach, Abu Dhabi

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FAQs

Why is continuous dewatering critical in marine excavations?

Continuous dewatering controls groundwater pressure and inflow, preventing instability and allowing safe excavation in permeable coastal soils.

How do multiple pump types improve performance?

Using both high-capacity and distributed pumps enables effective management of bulk inflow while maintaining control across the full excavation area. Selecting the right pump configuration for site-specific conditions is explored in our Guide to Industrial Pumps.

How is operational continuity maintained during dewatering works?

Through standby capacity, independent power supply, and scalable pump deployment, ensuring immediate response to changing site conditions.