Long-Term Groundwater Monitoring in Devon and Cornwall
Effective groundwater monitoring is essential for sustainable development across Devon and Cornwall, where geology, rainfall and mining legacies can create complex subsurface conditions. At Ground Consultants Limited (GCL), we specialise in long-term groundwater monitoring, helping developers, planners and engineers manage flood risk and design robust drainage strategies.
Recent guidance from Cornwall Council’s Lead Local Flood Authority (LLFA) highlights that groundwater levels must be monitored during the wetter months – typically 1st November to 31st May – when seasonal peaks occur. For many planning applications, particularly major developments or sites in Critical Drainage Areas, regulators now expect evidence of groundwater monitoring data to support drainage designs. Without it, projects risk delays, costly redesigns, or even objections at planning stage.
At GCL, we operate over 50 long-term monitoring boreholes across the South West, giving us unrivalled regional experience. Our team installs purpose-designed boreholes to depths informed by site geology and drainage proposals, and we use both manual dip tests and automated data loggers to record fluctuations in groundwater levels. These datasets are then used to demonstrate the required 1.0m buffer between soakaway bases and the groundwater table, helping to ensure SuDS (Sustainable Drainage Systems) remain effective throughout their lifespan.
Beyond compliance, monitoring provides developers with peace of mind. Raised groundwater can undermine soakaways, attenuation tanks and even building foundations, leading to costly failures. By investing in thorough site investigation and monitoring upfront, risks can be managed before construction begins.
GCL also supports monitoring with in-house GPS survey equipment, ensuring all borehole locations and site levels are recorded with survey-grade accuracy – a key advantage when integrating results into detailed drainage designs.
If you’re planning a development in Devon or Cornwall and need trusted, experienced support with groundwater monitoring and drainage design, contact Ground Consultants Limited today. With our local expertise, in-house equipment, and proven track record, we can help keep your project on track and compliant with LLFA and Environment Agency requirements.
