Large-scale groundwater treatment for underground station and interchange construction — high, sustained flows cleaned to consent on constrained, high-profile city sites.
The engineering behind this application — flow estimation, treatment-train sizing and discharge compliance.
High-volume pumping and treatment for excavation dewatering in urban environments.
High-head dewatering for the station’s launch and access shafts.
Recycle treated water across the station and tunnel works.
Underground stations and interchanges are large, deep boxes excavated over long programmes in the heart of the city. They produce high, sustained dewatering flows that must be treated continuously, often with no spare space and the tightest discharge points on the project. This page frames the application; the linked engineering guide covers large-box flow estimation, treatment sizing and urban discharge.
Sustained High-Volume Treatment in the City
A station box can dewater continuously for many months, so the treatment plant has to be robust, automated and quiet enough for a sensitive urban setting. We design large-format trains — multiple lamella streams, automated coagulation and pH control, and filtration polishing — that hold high flows within Trade Effluent and surface-water consent. Treated water is often recycled across the project for batching and dust suppression, easing pressure on limited urban discharge capacity.
Robust large-format plant for months of continuous station-box dewatering.
Parallel lamella streams give capacity and resilience with maintenance redundancy.
Acoustically considerate, screened plant for sensitive city-centre sites.
Treated water shared across the works for batching, washing and dust control.
Treating a City-Centre Station Box
Station dewatering combines large volumes, long duration and an unforgiving urban context. Discharge points are scarce, neighbours are close, and the regulator watches closely.
Months of continuous running demand high reliability and easy maintenance.
Limited urban sewer and watercourse capacity pushes toward reuse and tight control.
Deep city ground often mixes natural aquifer water with legacy urban contamination.
From Station Sump to Compliant Discharge
Plant We Build Into These Trains
Coarse and fine screens remove debris, formwork waste and timber that would otherwise blind pumps and settlement plant.
View EquipmentHydrocyclones and sand traps strip abrasive sand and grit to protect pumps, valves and downstream media.
View EquipmentHigh-rate inclined-plate settlers achieve a large settling area in a small footprint for rapid TSS reduction.
View EquipmentAutomated acid/alkali dosing brings high-alkalinity or acidic groundwater within consent before discharge.
View EquipmentInline coagulant and polymer dosing destabilises colloidal fines so they settle or filter out reliably.
View EquipmentMultimedia and pressure filters polish settled water down to low single-figure NTU for tight consents.
View EquipmentWhy Choose Reynolds & Bauhm
See how we estimate the flow, size the treatment train and prove the discharge for metro station dewatering.
Explore Other Dewatering Solutions
High-volume pumping and treatment for excavation dewatering in urban environments.
ExploreTalk to our engineers about a system sized for your site, flow and discharge consent.
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