Before construction gets underway, it’s important to find out how things look under the surface. Knowing the composition of the subsoil and groundwater flow can help prevent the project from running into unforeseen problems. COWI’s team of experienced geologists and hydrogeologists know what steps are necessary in order to make sure construction goes off without a hitch.
Lowering groundwater levelsKeeping water out of construction pits often requires lowering groundwater levels. Failure to do so can cause the pit to collapse and dramatically increase the cost of the project. When calculating how much groundwater levels need to be lowered, COWI draws on its expertise in geology and hydrogeology, test pumping and hydrologic modelling.
COWI's solutions are based on an evaluation of the impact a project will have on its surroundings. Through its focus on the effects on neighbouring structures, COWI has built up an expertise in refiltration, a process that prevents groundwater from unintentional being lowered in others areas and damaging buildings.
Groundwater pollutionLowering groundwater can lead to increased pollution levels. The pollution can spread to other aquifers during the refiltration process or to surface bodies of water if the water from the pit is disposed of incorrectly. Dealing with polluted water correctly requires a knowledge of groundwater chemistry and monitoring – two of COWI’s main competencies.
Monitoring programmeCOWI has years of experience creating and operating monitoring programmes. As part of construction of the Cityringen metro line in Copenhagen, COWI created a wireless monitoring system that can keep a constant eye on any changes in groundwater levels. Such systems save time and money by making it possible to take corrective action before problems get out of hand.
COWI draws its experience from major projects such as the Øresund Bridge, Cityringen and scores of other less prominent construction and infrastructure projects. Each time we work on a new project, we create improved groundwater management methods that are tailored to the requirements of the individual project.
