Deepwell Dewatering Archives

Finch West LRT Project, Toronto

RiotSpace Creative June 8, 2021

The Dewatering Vendor of Choice for Toronto LRT Projects

The success of the Eglinton Crosstown LRT (Light Rail Transit) project (also known as Line 5) in Toronto, where we have provided dewatering services to great effect on 12 of the 14 stations, has led to WJ becoming the dewatering vendor of choice for large LRT projects in the city.

Finch West Station

The Finch West Station includes a deep connection to the existing subway station and an underground track crossing – in short a deeply complex project, that will require the installation of deep wells, wellpoints and eductor wells. Fortunately these types of projects are second nature to WJ and perfectly demonstrate our creative and flexible approach to providing successful and efficient dewatering solutions that we have shown on thousands of project in Canada and elsewhere across the globe!

Humber College Station

The Humber College station, located adjacent to Highway 27 will be another opportunity to demonstrate many of the dewatering techniques that were used to great effect on the deep excavations of the Eglinton Crosstown project.

Finch West LRT

Building on the success of this project, WJ have recently begun work on the Finch West LRT project. The Finch West Project (also known as Line 6) continues the expansion of public transit services in Toronto and is expected to carry some 40,000 passengers per day by 2031. Our initial works on the project will cover the two new underground station that are due to be constructed: the new terminus at Humber College and the new interchange terminus at Finch West, where the new line will connect with the Line 2 extension to York University.

We are proud to be given the opportunity to contribute to this exciting project, and the continued expansion of public transit projects in Toronto, and look forward to its successful completion, and having the opportunity to hop on board!

LOCATION: Toronto
CLIENT: Metrolinx

New Tottenham Hotspur Stadium

RiotSpace Creative June 8, 2021

White Hart Lane, in North London, was the home of Tottenham Hotspur FC for 118 years and during that time played host to some of the worlds greatest footballers before it was decided in 2017 that a new 62,000 seater state-of-the-art stadium, the biggest club stadium in London, would be built to replace the existing White Hart Lane ground.

Passenger Terminal Expansion Works

RiotSpace Creative June 7, 2021

The Hamad International Airport terminal expansion project will include an additional 140,000 sq.m terminal building, located airside, adjoining the existing terminal building through Concourse C with an axis that will culminate into a central garden. It will include a new transfer area which will help shorten passenger’s connection time and will improve their overall transfer experience at HIA. This will also contribute to servicing the continued growth of HIA’s national carrier Qatar Airways.

The Passenger Terminal Expansion Works, Central Concourse Building and Early Works (PTEW) was awarded to the joint venture of Midmac Contracting, TAV Tepe Akfen Investment Construction and Taisei Corporation on November 2019.

The scope of work consisted of:

Central Concourse Expansion Building and Apron Works
Diversion of existing utilities
Demolition of existing Fixed Jet Bridges
Underground Automated People Mover Station Box

Remote Underground Chilled Water network connecting Central Utility Plants

Scope of dewatering works is consist of the construction of APM Box, Cup 2 & Cup 4 connection and Central concourse (Pile caps). The APM box structure is composed of a 151.2m long by 25m wide with 2 nos. of monitoring well and 14 nos. of deepwells at the depth of 27m BGL. For Central concourse (Pile Caps) is composed of a 4m long by 4.4m wide with sump pumping technique is implemented and for CUP 2 & CUP 4 connection which is composed of 100m long by 9.4m wide consisting of sump pumping using surface suction diesel pump technique supplementary with trenching system.

The groundwater level encountered at the range of +0.39m QNHD and -1.19m QNHD at West and East of existing Concourse and the groundwater level at APM area is found in the range of -0.78m QNHD and -1.42m QNHD.

The system is supplied complete with pumps with standby units, power supply system, control panels with suitable alarm system and 24hr monitoring team.

LOCATION: Hamad International Airport, Doha, Qatar (25.2609° N, 51.6138° E)
CLIENT: Qatar Company for Airports Operation and Management (MATAR)
PROJECT MANAGER: HILL-DAR JV
MAIN CONTRACTOR: MIDMAC-TAV-TAISEI Joint Venture

Qetaifan Island Infrastructure Works

RiotSpace Creative June 7, 2021

Qetaifan Island North is located off Lusail City, Qatar. Designed to be Qatar’s future iconic destination; the project spans approximately 1.3 million square meters.The island also features exciting entertainment attractions, luxurious hotels, pedestrian friendly streets and world class facilities.

The project, Qetaifan Island North Phase 1 Development Package 4 – Infrastructure Streetscape & Linear Park. The project is consist of the construction of shafts/manholes for Foul Water & Surface Water drainage in Qetaifan Island.

WJ installed the deep well dewatering scheme supplemented by sump pumps and Diesel pumps for 29 shafts which has a depth of -3m BGL to -11m BGL & Width of maximum 8mx8m.The trenches depth of -3m BGL to -6m BGL and length of 1700m & Width of 6m. This system will facilitate an advanced drawdown keeping a dry and stable working condition at all times as the excavation works progresses. Additionally, The ground fissures/ cavities are encountered, additional sump pumps can be installed to try managed the situation. In total 18 dewatering wells installed for UR12 area and 12 deep wells for SW1 area, 24 Diesel pumps and 14 Sump pumps were used for SW2 and SW4 area.

We have two discharge locations in this project, with Electromagnetic flow meters to monitor the flow rate. For the quality control of discharging water have a combination setup of Lamella clarifier with settlement tank.

Although the Project began at the start of August 2020, The installation works has progressed during day time hours, only monitoring to be undertaken during Night hours.

LOCATION: Lusail City, Qatar
CLIENT: Qetaifan Projects
MAIN CONTRACTOR: Consolidated contractors group (CCC)/TEYSEER COMPANY WLL – JV

Al Shuweihat S3 Power Plant Project

WJ Groundwater Admin July 5, 2016

Construction of this Power Plant Project, located approximately 260m kilometres west of Abu Dhabi, UAE, included a power plant with an electrical capacity of 1,600 megawatts. There are also four gas turbines, six generators and two steam turbines.

The excavation itself was 100m by 60m at a ground level of +5.0m ACD. The excavation level was -9.7m ACD (14.7m depth), with side supports by diaphragm wall on three sides and cement bentonite wall on one side.

The scope of works undertaken by WJ included drilling and installation of the deepwells followed by commissioning, operation and maintenance of a deepwell dewatering system.

MAIN CONTRACTOR: Soletanche Bachy
CLIENT: Shuweihat Asia Power Company
LOCATION: Ruwais, UAE

Dubai International Airport dewatering stormwater pipe line excavation

WJ Groundwater Admin June 13, 2016

WJ Groundwater have completed several projects at Dubai International Airport. This commission saw us use wellpoints to dewater the length of a new stormwater and fuel line that was being installed by ALEC at the Dubai International Airport.

WJ installed a single sided wellpoint system to provide the Main Contractor with clear access to the trench from one side to undertake excavation work and to install the storm water pipeline and fuel line without obstructions. As ALEC wanted a quick installation and speedy drawdown, instead of using conventional jetting techniques, the wellpoints were installed using WJ’s SM14 rotary drilling rig. The trench was dug in the open with stepped face to maintain stability. WJ were chosen to undertake the works as they have been working on the airport for over 10 years and have considerable knowledge of the ground conditions, were extremely competitive, and maintain up to date landside and airside gate passes for their dedicated airport engineers and technicians.

The project went extremely well and the engineers on site were impressed by the tidiness of the installation. WJ used diesel wellpoint pumps connected to a central headermain to draw the water out of the ground. Contact WJ Groundwater today to find out how we can assist you with pipeline dewatering.

Sheraton Park Project

Neil.Coulter May 26, 2016

WJ confidently deliver successful projects of all sizes, and this commission was certainly a big one!

The Sheraton Park project is situated in a prime location on Doha’s Corniche between, the Sheraton Hotel and the Doha Exhibition Convention Center.

The project is expected to provide an iconic public landscaped park, complying with high standards of aesthetics, quality and safety for residents and visitors of Doha. The project consists of five water-themed features, uniquely folded hard and soft landscaping with flowering trees and shrubs, children’s play area, two sunken gardens with adjacent restaurants, an underground four-level car park for 2,664 cars, an underground connecting tunnel link (under the Corniche) for overflow traffic from Doha Exhibition and Convention Centre and a 66KV primary power substation.

The excavation is approximately 500m by 250m in size with approximate total perimeter of 1,270m. General excavation formation level is at -3.5m QND and extends down to a maximum of -14.3m QND. The total perimeter length of the deeper excavation is approximately 900m. Shoring system would be by contiguous piles, secant piles and shotcrete & nails.

WJ Groundwater installed a deepwell dewatering system which successfully drained the excavation.

LOCATION: Doha, Qatar
CLIENT: Sheraton Hotel
CONSULTANT: Qatar Project Management
MAIN CONTRACTOR: Qatari Diar – Vinci Construction JV

QP Financial District

Neil.Coulter May 26, 2016

Our first project in Qatar, we certainly began big and quickly established our reputation for excellence and innovation.

Formerly known as the Barwa Financial District, the QP District project consists of nine towers, one hotel and an energy centre.

Situated in the new West Bay business district of the capital, Doha, the QP District is a gigantic commercial development project located on a plot of 7 hectares. With the nine towers mainly consisting of office space, there will be some room for a number of restaurants and shops located on the ground floor, which will be of benefit to the occupants who will be keen to avoid the sky high temperatures during the summer months.

The hotel, whose brand identity remains nameless, will be located at the southern-most point of the site, ensuring that international guests can be located nearby to what will be a centre for Doha’s financial sector. Located just to the south-east of the Ezdan Tower, the QPD project occupies a prime position within the West Bay area, allowing both easy accessibility for staff and visitors, as well as some extraordinary views.

In 2008, WJ Groundwater designed, installed and operated its first project in Qatar. The project is a sizeable 250 x 300m excavation, with a total perimeter of 1,100m. The plot is supported by contiguous piles. A deepwell dewatering system was installed around the perimeter of the plot to achieve a general excavation level, and several internal wells were installed for the tower basements.

LOCATION: Qatar, United Arab Emirates
CLIENT: Qatar Petroleum / Barwa
CONSULTANT: KEO International Consultants
MAIN CONTRACTOR: Bouygues-Midma-Al Jaber JV / Swissboring

Lusail Expressway

Neil.Coulter May 26, 2016

Lusail Expressway is one of the largest among 30 road projects to be developed as part of Qatar’s seven-year Expressway Programme.

Initiated in 2010 to connect people and places across the city of In 2010, Qatar’s seven-year Expressway Programme consists of 30 road projects, with the aim of connecting people and places across the city of Doha and wider Qatar. Nine hundred (900) kilometres of new road network involving a number of underpasses, flyovers and multi-level interchanges are expected to be delivered.

The Lusail Expressway is one of the biggest to be developed, with 5.3 km of four-lane highway in both directions, two cofferdams and three major interchanges; the Al Wahda Interchange, Onaiza Interchange, and the Pearl Interchange.

The Expressway will also have two service lanes in the multi-level interchange areas, and include a complex network of tunnels, flyovers and junctions in order to meet the future traffic demands by providing easy and speedy connectivity.

Dewatering of the project proved a challenge, as unforeseen and unexpected cavities and fissured flows were encountered, with at the peak flow in excess of 10,000 m3/hr for one of the underpasses! However, WJ rose to the challenge and dewatering was achieved with deepwell system and supplemented with sump pumping.

LOCATION: Qatar, United Arab Emirates
CLIENT: Ashghal (Qatar Public Works Authority)
CONSULTANT: CDM Smith / AECOM / KBR
MAIN CONTRACTOR: Hyundai Engineering and Construction

Al Maktoum Hospital Phase 2

Neil.Coulter May 25, 2016

On the historical site of the Al Maktoum Hospital, this re-development included construction of three neighbouring buildings and a great solution from WJ Groundwater.

The basements of the three buildings were constructed within one large irregular shaped excavation with a perimeter of approximately 1,200m. The excavation was up to 9m and was supported by secant piles around the perimeter.

WJ worked closely with the piling specialist Stromek Emirates Foundation LLC to come up with a dewatering solution that meant that the deepwells could be located in the indent of the secant piles. This meant that the deepwells were kept outside of the footprint of the proposed basements, removing the requirement for complicated structural and waterproofing details. This also made protecting and maintaining the dewatering system simple as they could be accessed from the top of the capping beam.

The project was a great success and this was another example of how good dewatering design and thoughtful implementation can maximise programme and commercial savings.

LOCATION: Dubai, United Arab Emirates
CLIENT: Al Maktoum Hospital Phase 2
MAIN CONTRACTOR: Stromek Emirates Foundation LLC