Flood Catastrophe Model Development and Review

Helping clients to understand, manage and quantify flood risk across the world 

Since 2004 Hydro-GIS have been working with the insurance and property industries, governments and financial institutions, providing our clients with a full understanding of their exposure to flood risk.

Hydro-GIS have carried out a number of studies overseas including Europe, North America, South America and Asia.

The expertise we have developed make us ideally suited to undertaking reviews and audits of flood catastrophe models for Solvency II requirements.

Our detailed and analytical approach to flood modelling enables us to offer bespoke solutions for your individual flood risk needs. From individual site risk assessments and portfolio optimisation to flood defence design and unique model builds, our dedicated team of flood experts will work with you to manage your personal flood risk challenges.

At Hydro-GIS, we pride ourselves on being meticulous and thorough. As a small company, we offer a personal approach and focus on delivering tailored solutions which meet your specific requirements.

Commercial cat modelling software often has extensive documentation on how to apply the software but very little information on how the hazard component of the model has been developed. All too often a modelling company will claim how their model is better than others purely on the use of a higher resolution DTM, when in reality the routines used for generating flood events can be very poor.

Particularly important model assumptions are often not explained in the documentation. For example, the first RMS UK flood cat model had a significant step increase in losses as event return periods increased. Without a knowledge of the model development this was difficult to understand. The change could however be directly attributed to how flood defence failure was simulated in the model with a simple routine removing all defences as the predicted river flows for effected rivers exceeded the 100-year return period, which gave a vast increase in flood extents.

Results from our catastrophe modelling can be used for:

  • Reinsurance pricing – calculating the long-term expected loss cost
  • Assessing capital requirements – assessing the unexpected loss cost from low frequency, high severity catastrophic events
  • Planning and portfolio management – demonstrating the impact of diversification and concentration of risk and potential changes to reinsurance structures

Our modelling is platform agnostic and available across a variety of platforms, including Oasis, the Nasdaq Risk Modelling service, and Elements.

Get in touch

Talk to us today and discover how Hydro-GIS can help with your project

University College London Courses

Dr Harvey Rodda includes a section on flood catastrophe model development as part of the MSc in Geophysical Hazards and Certificate in Natural Hazards for Insurers course at University College London.  Download the course brochure for more details: