RAB Consultants Ltd

Flood Risk Assessments
RAB Consultants is an expert Flood Risk consultancy, producing Flood Risk Assessments and Flood Consequence Assessments to the highest standard for commercial and residential developments of any scale, nationwide.

We have extensive knowledge of flood risk and Environment Agency regulation and consenting procedures to help developers and planners through the flood risk assessment process. This experience helps us to keep our costs down, whilst you have the reassurance of our expertise and past successes.

RAB Consultants has experience in producing reports to address the mandatory elements of the Code for Sustainable Homes and attain the available credits for SUR1 – 'Surface Water Run-off' and SUR2 – 'Flood Risk', located in Category 4 - Management of Surface Water Run-off from developments.

Our dedicated team of flood risk consultants are fully proficient with the contents of the development and flood risk planning statements for England, Wales and Scotland. We offer a professional and personal service to maintain a healthy working relationship with you.


We offer a range of different flood risk capabilities, including:

• Flood Risk Assessments in accordance with National Planning Policy Framework (NPPF) and Scottish Planning Policy (Scotland);


• Flood Consequence Assessments in accordance with Technical Advice Note 15 (Wales);


• Estimation of flood flows and river levels using the Flood Estimation Handbook (FEH) and flood modelling techniques including HEC-RAS and Micro Drainage;


• Flood defence consent applications prepared and submitted in consultation with Environment Agency Development and Flood Risk staff;


• Advice on flood defence and development control issues;


• Flooding problem investigation and planning appeals;


• Breach/overtopping assessments;


• Computation of surface water run-off rates;


• Design and implementation of Sustainable Drainage Systems (SUDS);


• Modelling overland flow routes;


• Drainage Impact Assessments;


• Expert witness services;


• Property Level Flood protection surveys.

Drainage Assessments
Here at RAB Consultants our engineers and flood risk consultants can assist you with your drainage requirements. From advice on soakaways or pipe sizing to the design of multi-stage Sustainable Drainage System (SUDS) schemes, our experienced team use the latest software to create drainage solutions for commercial and residential sites. By building a close relationship with you, we are able to provide innovative solutions to your specific drainage needs.

We work with architects, developers, planners and individuals to obtain statutory consents and approvals for foul and surface water drainage designs to assist in the planning process.

We offer an expert consultancy service to report on the causes of drainage issues, assess the impact of building works on drainage paths and recommend solutions to drainage issues in order to advise on particular onsite problems or in support of legal disputes.

You may also require a Flood Risk Assessment for which we can help.

Our services include:

• Designing surface water drainage schemes;
• Incorporating the latest SUDS techniques;
• Greenfield and pre/post-development runoff calculations;
• Use of the latest industry standard drainage design software;
• Discharging surface water planning conditions;
• Discharging foul water planning conditions;
• Obtaining consents and approvals from local authorities and the Environment Agency for the construction of outlet structures and discharge of foul and surface water;
• Expert drainage consultancy.