Flooding, Dam and Embankment Assessments
Block Fen, Cambridgeshire. Development of hydrogeological conceptual site model and the groundwater and surface water monitoring strategy for the Environment Agency as part of the Flood Risk Management Strategy for Block Fen which is part of the larger Cranbrook/Counter Drain FRM strategy.
Kendal FAS, Cumbria.
Review of site investigation requirements and subsequent SEEP/W modelling to include analysis of critical gradients and flows to aid efficient flood embankment and wall design along six different reaches.
Strensall, York.
Review of site investigation requirements and subsequent SEEP/W modelling to include analysis of critical gradients and flows to aid efficient flood embankment and wall design. Development of a MODFLOW model to assess the impact of the clay core embankment on groundwater flows to the down gradient SSSI, due to inability of SEEP3D to be able to simulate the conceptual model adequately.
Godalming FAS, Surrey.
Review and modelling of the interaction of the groundwater system with the proposed flood defences and surface water level predictions to enable more effective flood wall design. Pumping test design and analyses undertaken.
Severn Stoke, Worcestershire and Pocklington, York.
Review of site investigation requirements and subsequent SEEP/W modelling to include analysis of critical gradients and flows to aid efficient flood embankment and wall design.
Groundwater Modelling and Review and Hydrocarbon Related Investigations
Wales and West Utilities
Various sites including Ocker Hill and Camarthan. Quantitative controlled water risk assessments have been conducted for a number of sites using a variety of risk assessment techniques such as ConSim and the P20 remedial target spreadsheet for a large variety of contaminants in dissolved phase and free phase.
Cross Rail/Secondsite Property Holdings/English Partnerships
A groundwater flow and transport model (MODFLOW with MT3D) was developed for the Greenwich Peninsula in order to establish the impact of historical contamination, in particular tars, on public supplies within the area and to develop remedial targets. The boundary conditions for this model were taken from the larger London Basin Model. This model was subsequently refined in 2013 for CrossRail for which a technical review role was performed.
Confidential Client
Preparation of review documents for potential expert witness work of hydrogeological risk assessments in the Chalk aquifer for a large petroleum site in Hertfordshire.
Kerosene spill, Kent, UK
A kerosene spill occurred on the Chalk aquifer within an inner groundwater protection zone. A quantitative risk assessment (QRA) was conducted to assess the long-term impact of the spill on the groundwater source, and the feasibility of several remediation options. During the development of the conceptual site model signal tests were performed to constrain aquifer properties and understand water level variations over time and how they impact potential migration of kerosene. Due to the extreme complexity and heterogeneity of the fractured Chalk at the site, the QRA was conducted using a 1D double porosity model. Following remediation, tracer testing and further double porosity modelling was conducted to enable the Environment Agency to agree to cessation of monitoring and works at the site.
Research Project Funded By DTi Link Biorem 36
“Comparative assessment of approaches to predicting the fate and transport of dissolved phase hydrocarbons in Chalk aquifers”. Our current understanding of dissolved phase hydrocarbon fate and transport in Chalk aquifers in England is limited.
The primary aim of this research project was to extend this current understanding, through focussing on the dual-porosity nature, the adsorption capacity and the microbial processes most active in natural attenuation of hydrocarbons in the Chalk. A comparative assessment was made of modelling approaches ranging from simple porous to more complex dual-porosity flow and transport models to determine the most accurate and cost-effective methods under different circumstances. This was accomplished by applying a range of mathematical model types on a variety of sites where existing pertinent data are available such as MODFLOW with RT3D, TRAFRAP-WT, ConSim and P20.