Groundwater-sewer system interactions and resilient resource management: the case study of the Lens-Liévin city (northern France)
Abstract
In the urban catchment of the Lens-Liévin city, sewage network and treatment plants functioning are affected by groundwater dynamic. The main hypothesis is that groundwater infiltrate in sewer network through breaches when the groundwater level reaches the depth at which the network is buried. However, this phenomenon is still not accurately understand, preventing to develop efficient strategies for the maintenance of the sewage network and groundwater resource management. The CALL project tackles this gap through 5 working programs (WPs) dedicated to : i) simulate groundwater flow dynamics in the watershed, ii) develop numerical tools quantifying and forecasting the spatial extent and temporal dynamic of groundwater infiltration in sewer network, iii) describe the impacts of colloids mobilization by surface runoff on clogging of sewer network, iv) identify solutions to reuse parasite water and v) develop a refined geological model to link sub-surface geological properties with presence of damaged pipes. The CALL project being still in progress, only first steps have already been done in WPs 1, 2 and 5. They are dedicated to: i) acquire piezometric maps, ii) simulate piezometric level in transient regime at the watershed scale using a 3D hydrodynamic model, iii) elaborate a framework combining measured/simulated data to identify when and where groundwater infiltration impact sewer network functioning, iv) build a geological model of the watershed. The results provided by the CALL project will be used to better forecast the impact of groundwater dynamic on urbanized areas and optimize the solutions to mitigate them.
Origin : Files produced by the author(s)
Licence : CC BY NC ND - Attribution - NonCommercial - NoDerivatives
Licence : CC BY NC ND - Attribution - NonCommercial - NoDerivatives