Aerial lidar survey for flood plain mapping

Flood Studies

Merrett Surveys have completed hundreds of kilometres of water course surveys, over decades for the UK Environment Agency,  and in all of the EA regions. Always working to the latest EA National Specification and providing river sections, floodplain sections, topographic survey, control networks, asset surveys, coastal defence, beach and cliff erosion, post storm event survey, rural and urban drainage systems, culverts, structures ( bridges, weirs, mill leats, flood retention ponds ), pre and post dredge surveys for silt volumes and building threshold level surveys. These projects are completed by direct engagement from the Environment Agency or via their framework consulting engineers.

Flood study work has also been completed in Scotland and Northern Ireland (note – the Environment Agency’s remit is for England and Wales).

Commercial development sites, local authorities and individual land owners also commission us to provide land survey inputs for flood risk analysis.

Data can be delivered as topographical survey plans, photographic records, lidar derived terrain models ( DTM ), cross sections, long sections and ASCII inputs to flood analysis / hydraulic modelling software including ISIS, HEC-RAS and the EA’s own data format EACSD.

Flood extents topographical survey

Flood extents survey

Surveys for flood mapping

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