Technical Modelling to Support COMAH Safety Reports
Arthian delivers advanced modelling and containment assessments to support COMAH compliance across Upper and Lower Tier sites. Our team combines process safety, structural engineering, and environmental risk expertise to simulate firewater runoff, bund overtopping, and loss of containment scenarios—ensuring risks are understood, mitigated and documented to a level that is As Low As Reasonably Practicable (ALARP).
We support:
Whether you’re preparing a COMAH Safety Report, responding to inspection findings, or planning infrastructure upgrades, our modelling helps you make informed, regulator-aligned decisions. We also support bund inspection programmes, firewater containment planning, and emergency response strategy development.
We simulate firewater runoff and overland flow to understand how liquids behave during emergency scenarios. Our team assesses bund overtopping risks and evaluates tertiary containment capacity to prevent environmental release. We model catastrophic tank failure scenarios to quantify potential impacts and inform mitigation strategies. Hydrodynamic analysis is used to test bund strength and wave loading under extreme conditions. For critical infrastructure, we apply non-linear, dynamic time history analysis to assess the structural resilience of bund walls and tank foundations.
Fully integrated with geotechnical, hydrological, and ecological disciplines.
National experience with regional insight and regulatory familiarity.
Deep understanding of planning, infrastructure, and environmental interfaces.
Commitment to technical rigour, clear communication, and long-term outcomes.
Yes—firewater runoff can cause a Major Accident To The Environment (MATTE). Hydraulic modelling helps define containment volumes, flow paths and receptor risks.
Tertiary containment refers to systems that prevent off-site environmental impact if primary and secondary containment fail. Examples include sacrificial areas, lagoons and shut-off valves.
Absolutely. We simulate dynamic fluid release, bund overtopping and structural impact using validated hydrodynamic models.
Yes—we offer bund permeability testing, capacity modelling, and structural appraisal aligned with CIRIA C736 and COMAH containment policy.
We’d love to hear from you – whether you have a question, a project in mind, want to explore job opportunities, or just want to say hello.