Quintessa provides a 3D hydrogeological modelling service utilizing the state of the art code FEFLOW. FEFLOW has a long pedigree in providing high performance assessments of groundwater flow, contaminant transport and heat transport using a Finite Element approach.

In general terms, FEFLOW is capable of solving a variety of non-linear groundwater flow and transport problems, including various representations of unsaturated groundwater flow and transport, and coupled thermal-hydro-chemical (THC) models. FEFLOW is able to represent arbitrary chemical reactions amongst transported contaminants, including radioactive decay chains and solid-phase and liquid-phase interactions and includes adaptive meshing algorithms.

FEFLOW uses a Graphical User Interface that permits ready importing of a variety of Geographical Information System (GIS) formats such as ESRI Shapefiles, Georeferenced TIFF images, as well as a variety of generic ASCII text file formats. It can also be used as a direct extension of the site data management process with the associated QA benefits that such a strong linkage can bring.

As a complement to the extensive in-built functionality for post-processing FEFLOW model results, FEFLOW Explorer also allows the advanced analysis of results using OpenGL 3D rendering of results. This includes the production of high-quality animations to better relate complex time-variant and/or 3D models to non-technical audiences.

These capabilities make FEFLOW ideal for supporting Quintessa’s key business area of quantitative environmental assessments. FEFLOW has been used in support of a number of projects including the PCSEC for the Dounreay Shaft, the Low Level Waste Facilities at Dounreay, the Baita Bihor LILW Preliminary Safety Analysis Report and studies in support of various legacy facilities at Sellafield. FEFLOW is also being used in a number of on-going projects both within the UK and internationally.

For more information on applications of FEFLOW, please contact Alex Bond or Sarah Watson.