Lowering the Water Table in an Urban Area
Lowering the water table in an urban area, with disposal in the Saône through a dewatering network of 2×400 m
Context
Project Type :
Dewatering
Location :
Lyon (69)
Problem
- To construct CAPEB’s new offices, the customer requested lowering the water table in a wall of the type concrete lagging wall in an urban area
- The water pumped will be forwarded by a dewatering network of 2 x 400 metres, under the highway and on scaffolding, before being decanted and disposed of in the Saône
- Area: 500 m²
Solution
- Complete engineering of lowering the water table by deep wells
- Height to lower: 0.85 m
- Definition and realisation of pumping wells: 3 wells of 11 m
- Design of a bespoke feeder
- Complete pumping installation:
- 3 pumps for a total flow rate of 500 m³/h
- Dewatering network: 2 x 400 m conduits of 250 mm nominal diameter under the highway and on scaffolding
- 2 decantation vats before disposal into the Saône
- Remote monitoring of pumping with permanent on-call service
- Duration: 75 days
