Construction dewatering is rarely about clean water. Excavations collect groundwater, rainfall and runoff carrying sand, gravel and whatever the site surface contributes, and the pump has to keep working through it. Standing water in an excavation is a programme risk before it is an engineering one: it stops concrete pours, destabilises batters and closes access.
Site water is abrasive and inconsistent. A clean-water pump will block or wear rapidly, so solids-handling capacity usually determines whether a pump survives the job rather than whether it can move the volume. The B Series passes solids from 44 mm on the B100 to 124 mm on the B400.
Lowering a pump into an active excavation is often impractical and sometimes unsafe. Every eBORA model self-primes to 8.5 m, so the unit can be positioned at the excavation edge and still draw from the sump — and can restart on its own when the suction line drains.
Dewatering demand rises with rainfall and falls between events. Automatic self-priming matters here more than peak efficiency: a pump that will not re-prime after the sump empties needs someone on site to restart it, which is precisely when nobody is there.
Early-phase works and remote sites rarely have adequate electrical supply. Diesel packages built around CAT, Perkins, Deutz, Cummins or Yanmar engines run independently of site power; where supply exists, electric drive from WEG, ABB or Siemens lowers running cost and removes refuelling.
Selections below are based on the published specifications for each range.
The default range for construction. Six models from 245 to 3,350 m³/hr with solids handling to 124 mm. The B400 is worth noting specifically: it passes larger solids (124 mm) than the higher-flow B500 (79 mm), so it is often the better choice in coarse ground.
For deep excavations and shaft sinking where the discharge point is high or distant. Heads to 295 m, while retaining solids handling from 19 to 64 mm — unlike the K Series, which carries no solids rating.
Calculate total head, not just vertical lift. Friction loss along a long discharge run can exceed the static lift entirely, and a pump selected on lift alone will underdeliver on site.
Match port sizes to your pipework. Inlet diameters run from 100 mm on the B100 to 500 mm on the B500; connecting a large pump to undersized hose throttles it at the coupling.
Where site water carries fibrous material or organics rather than granular debris, ask about the sewage-impeller option for the B Series — standard solids impellers will rag up on stringy material.
It depends on the water volume and the total head, which includes friction loss along the discharge run as well as vertical lift. The B Series spans 245 m³/hr on the B100 to 3,350 m³/hr on the B500, covering most site requirements. Where the discharge point is high or distant, the L Series reaches 295 m of total head.
The B Series is built for it, passing solids from 44 mm on the B100 to 124 mm on the B400. Note that the B400 handles larger solids than the higher-flow B500, which passes 79 mm, so in coarse ground the B400 is often the better selection.
No. All eBORA models self-prime to 8.5 m, so the unit can be positioned at the excavation edge and draw from the sump. It also re-primes automatically when the suction line drains, so it restarts without anyone on site.