Dewatering works for the amplification of the sewage treatment plant “IDA-Vacallo” (TI, CH)
PURPOSES
The analyze of solutions for lowering groundwater levels in a 21x30m excavation area with a 3m variation. This includes estimating inflows into the excavation pit and proposing alternatives.
CLIENT
GEOLOG.CH, 2024.
WHAT WE DID
We enabled realistic and dependable assessment of dewatering needs (pumping rates volumes) to model and cross-compared various scenarios using a working 3D hydrogeological numerical model approach. The following 4 solutions have been simulated:
CASE 1: Pumping system, such as dewatering pumps, at the bottom of the excavation pit.
CASE 2: Pumping system, such as dewatering pumps, at the bottom of the excavation pit, and “jetting columns” around the excavation pit.
CASE 3: Pumping system, such as dewatering pumps, at the bottom of the excavation pit, with secant piles along the road to block water along the river axis.
CASE 4: System of 23 wells with “deep wells” type pumps along the road to block water along the river axis.
