Many infrastructure projects have the potential to affect the risk of groundwater flooding. ESI’s in depth experience of the types of groundwater systems that give rise to such flood risks can be invaluable in terms of understanding the risk factors and the potential solutions.
Groundwater flooding is related to the emergence of groundwater at surface or within excavations or subterranean structures when groundwater levels rise.
The groundwater is commonly derived from superficial aquifers in response to adjacent river and surface water flood events or from deeper bedrock in relation to increased recharge.
Management of groundwater discharge along spring lines or during excavation is also relevant. In some cases increased recharge, from a soakaway system for example, or disruption of a small aquifer due to construction, may lead to a rise in groundwater levels which could impact adjacent infrastructure.
ESI provides a tiered approach to Groundwater Flood Risk Assessment ensuring the best value option is available for all sites:
Groundwater forms one component of flood risk and ESI’s experience in other forms of flooding means that these can also be assessed.
In complex situations, a site visit and more advanced modelling work are offered to allow for a more definitive statement on flood risk at the site.
If required site investigations that include drilling and subsurface testing can be provided to collect specific hydrogeological information.
Visits can be combined with other aspects of work, such as contaminated land and geotechnical assessment, to provide cost savings.
Design and implementation of groundwater control measures is undertaken to protect infrastructure, either during construction, or longer term.