Gondolin Land & Water

SERVICES

Gondolin’s Civil Engineers and Hydrologists are well versed in the design of flood compensation and mitigation schemes which includes both the engineering design and detailed hydraulic / hydrological modelling to inform the geometry, hydraulic controls and construction details. This type of assessment and design work predominately arises where development in or adjacent to the design floodplain is proposed. Our hydrologists are experienced in the use of industry standard flood modelling software such as TUFLOW, Flood Modeller Pro and HEC-RAS to develop 1D, 2D and linked 1D-2D hydraulic flood models and derive design flood flows using UK standard methods such as WIN-FAP, ReFH and FEH methods.

Our approach to this Service is to undertake detailed topographic and hydrological site surveys, establish the baseline flood conditions, then work closely with the project team to understand the key constraints and opportunities which the flood compensation / mitigation scheme needs to factor in (i.e. proposed level of protection, infrastructure upgrades / diversions, sensitive ecological / environmental receptors, cost-benefit ratio, commercial requirements etc). A detailed optioneering analysis would then commence where the baseline flood model is updated with the proposed compensation / mitigation options and flood outputs produced to determine their effectiveness. We would then typically produce an initial options appraisal report which would be put to stakeholders and the developer, then following analysis and scrutiny the options would be narrowed down to a preferred approach.

Fundamental to the successful design and implementation of any flood mitigation / compensation scheme is focussed stakeholder (and where applicable, community) engagement and the need to ensure flood risk is not increased elsewhere outside the confines of the study site.

Our Team have developed flood mitigation and compensation schemes for nationally significant Critical Infrastructure Projects across the UK and also support local developers and landowners by maximising developable land area using the approach outlined above.

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