Flood Risk Assessment Review

We were appointed to review the methodology and modeling to inform a Flood Risk Assessment in Essex.


Customer: Essex County Council

We have a strong relationship with Essex County Council having delivered eight surface water management plans previously. The surface water management plans provide recommended action plans that the council can progress with to address surface water flooding potential, this includes within a context of strategic development. Essex, therefore, appointed us due to our expertise in flood risk in the context of planning to peer review a hydraulic model and flood risk assessment methodology which had been used to inform a flood risk assessment of a strategic development site.

Essex requested our expertise to confirm the quality of the original assessment and comment on its appropriateness as a basis for accepting planning permission and provide recommendations to improve the quality of the study and satisfy planning requirements and Environment Agency standards.


The in-depth review of the flood risk assessment identified several elements of the methodology which required further improvement. As part of the review, We engaged the Environment Agency for general comment on their expectations of the FRA methodology, and for local detail on any critical river network structures which may influence flow or water levels within the upstream catchment relevant to the development site.

By maintaining an open dialog with the client and with the Environment Agency, we were able to provide a list of key recommendations with a Red Amber Green approach based on the expected impact to quality and outcome of the Flood Risk Assessment. The list of recommendations were addressed by the planner and ultimately the Flood Risk Assessment was accepted by Essex County Council.


Related projects

Brisbane River Catchment Flood Study – Comprehensive Hydraulic Assessment

The Brisbane River Catchment Flood Study is the most detailed and comprehensive flood study ever undertaken in Australia. The hydraulic models that were developed underwent rigorous calibration. A sophisticated Monte Carlo approach was used to hydraulically model 11,340 flooding scenarios. The result was a robust and defendable set of design events. The study was fully peer reviewed by a panel of independent experts.

Onshore Pipeline Environmental Risk Assessment

Singapore Office of the American Bureau of Shipping (ABS), commissioned BMT to undertake a Quantitative Environmental Risk Assessment to determine the risk posed by a newly-installed buried aviation fuel pipeline within a military facility.

Threat and Risk Assessment for the New South Wales Marine Estate

We were engaged by the Department of Industry on behalf of the Marine Estate Management Authority (MEMA) to provide strategic risk assessment advice for the TARA process for a pilot project for the Hawkesbury Marine Shelf Bioregion and then for the State-wide marine estate.

Coastal Hazard Assessment Strategy for the Cairns Regional Council (2019-2020)

We have led the development of coastal hazard maps (sea level rise, storm tide inundation and erosion) for the City of Cairns in Far North Queensland and used this information to undertake a risk assessment of assets and infrastructure of the City under three timeframes (current, 2050 and 2100), incorporating climate change projections.