Contract Services – Dewatering Solutions by Al Khandaq
Al Khandaq has long been recognized as a leader in dewatering services. Through KTS, we offer end-to-end solutions — from design and supply to installation, commissioning, and maintenance — for a wide range of dewatering systems.
Specialized Support & Custom Fabrication
Our fully equipped workshops allow us to perform advanced testing, maintenance, and fabrication of custom equipment tailored to the unique demands of each project.
Engineered for Safe Construction
We design, build, and operate dewatering systems that support safe and efficient construction. Each solution is customized based on:
- Soil type and permeability
- Depth of excavation
- Size and nature of the structure
- Site access and location
- Project timeline and construction schedule
To achieve dry and stable subsurface conditions, we deploy proven techniques such as:
- Well-point systems
- Deep-well systems
- French trench systems
- Horizontal dewatering
- Electro-osmosis
Al Khandaq remains committed to delivering reliable, site-specific dewatering solutions that enable successful project execution.
Well Point Method
This method is especially effective for shallow excavations (less than 6 meters) in permeable soils such as sand or gravel.
Spacing Between Well Points
| Soil Type | Typical Spacing |
|---|---|
| Coarse Sand | 1.5 – 2.0 meters |
| Medium Sand | 1.2 – 1.5 meters |
| Fine Sand / Silt | 1.0 – 1.2 meters |
Well Point Installation
Types of Well Point Systems
Single-Sided Well Point System
Well points are installed on one side of the excavation. Suitable for narrow trenches or linear excavations.
Double-Sided Well Point System
Well points are installed on both sides of the excavation. Ideal for wider trenches or rectangular pits.
Multistage Well Point System
Multiple vertical levels of well points are installed in stages. Used for deep excavations exceeding 5–6 meters.
Deep Well Method
This method is effective for deeper excavations (typically 6 to 20 meters). It uses submersible pumps installed inside vertical wells to continuously remove groundwater.
Installation Steps
- Drill borehole and install steel casing
- Install PVC screen and aggregate (6/8”)
- Connect the system and activate pumping
Sumps and Trenches Method
A simple and cost-effective technique used to collect and remove groundwater from shallow excavations.
Best suited for impermeable or semi-permeable soils such as clay or silty sand.
Horizontal Dewatering Method
This method involves installing perforated pipes horizontally beneath the ground surface to rapidly lower the water table.
It is particularly effective in sandy or gravelly soils and for large surface areas such as roadbeds, basements, and tank foundations.
Electro-Osmosis Dewatering Method
This advanced technique uses electrical currents to move water through soils where traditional methods are ineffective.
It is particularly useful in deep excavations, tunneling, and challenging soil conditions.
