Deep well dewatering system

Deepwell dewatering systems lower groundwater levels using a series of drilled wells, each fitted with its own electric submersible pump. Large drawdown as much as 40 meters can be achieved. WJ carefully designs and installs deepwell systems to maximise drawdown and pump efficiency whilst ensuring a discharge free of suspended solids.

Why Use Deep Well Systems?

Deepwells are ideally suited to granular soils and rocks, where the permeability is medium to high. The number, depth, and spacing of wells along with size of pumps can be adjusted to meet site conditions. Deepwells are installed with our fleet of rotary drilling rigs and piling drilling rigs. WJ Groundwater only uses high quality machine cut slotted PVC well screen and selected filter materials.

WJ Groundwater uses its significant experience of designing and operating deepwell dewatering systems throughout the Middle East and further afield to design and implement new schemes. With our 30 years of experience, it is common that we have previously dewatered a neighbouring site or worked in similar ground conditions. Deepwell dewatering works extremely well in most ground conditions found in the Middle East including those found in the UAE and Qatar.

WJ Groundwater provides a central control cabin which powers and control multiple pumps from a single location. Control options include automatic mains failure (ATS) switchover to standby power, visual / audio / GSM text alarm systems, and remote data logging for monitoring discharge flows and groundwater levels.

Deepwells are ideal for deep excavations, shafts, basements, underpasses and tunnels.

Sump pumps offer a reliable and straight forward way of controlling groundwater inflows in rock and stable soils. WJ Groundwater commonly uses a combination of sump pumping and deepwell dewatering to control fissure and fracture flow in bedrock. The key to success when sump pumping is to construct trenches and sump pits to intercept and channel water towards the sump pumps. Where low permeability soils and rock are encountered or where overbleed is a problem, installation of French Drains leading to sump pumps or deepwells can be an ideal solution. A French drain is a trench installed with a horizontal slotted pipe and backfilled with aggregate allowing water to flow freely along its length to a sump pit. Trenches are typically 0.5m wide and a minimum of 1.0m in depth with a slope towards the collection point.

Why Use Sump Pumping?

Sump pumps are commonly used for overpumping lagoons, lakes, pipelines, and sewage treatment works. As they are significantly smaller than diesel surface pumps, they can be placed in confined spaces such as manholes, or placed on floating pontoons in the centre of lakes. A key benefit is that as they are electric they are much quieter than diesel pumps, can be connected to a super-silenced generator or mains power supply, and are extremely robust.

WJ Groundwater have a large fleet of electric sump pumps ranging from 2kW to 90kW, from 2l/s to 250l/s, suitable for pumping both groundwater and sewage.