Flood Risk Assessments

The government’s National Planing Policy Framework (NPPF) stipulates that development proposals in areas at risk of flooding must be accompanied by a Flood Risk Assessment, which quantifies the risk of flooding to both the development and the surrounding local area.

Flood risk is therefore an important issue that affects the viability of many development sites and failure to produce a competent Flood Risk Assessment normally results in planning consent being withheld.

The NPPF sets out clear national standards for completing a Flood Risk Assessment but often, in addition to this, local plans contain specific policies regarding development and flood risk, which also need to be taken into consideration.

A full understanding of local and national requirements is therefore necessary, in order to produce an effective Flood Risk Assessment.

“Excellent work by our contact on our FRA and subsequent calculations. Nice to work with, responsive, keeps promises.”David Robertson (Private Individual)

“CEC directly negotiated with the Environment Agency to help overcome initial objections. Their pragmatic solution to a problem allows for a positive outcome for our clients.”Pierre Dowsett, Associate – Planning & Development, Strutt & Parker

The Benefits

A professional Flood Risk Assessment prepared by Cole Easdon Consultants will:

  • Take into account the requirements of the national NPPF standard as well as specific Local Authority requirements
  • Provide developers with the information needed by Local Planning Authorities in order to gain timely planning consent for their developments
  • Provide the Local Planning Authority with an assessment of the impact of any new development on flood risk to the established community
  • Include a sustainable drainage system for new development
  • Propose cost effective improvements, which will reduce flood risk
  • Provide a quantified assessment of flood risk from all sources

Click here for case study examples

How We Can Help

As experts in water management we provide some or all of the following services to deliver the appropriate Flood Risk Assessment for our clients:

  • Desk studies
  • Detailed hydrological investigations using the Flood Estimation Handbook (FEH)
  • 1D and 2D hydraulic modelling using Flood Modeller (River Modelling Software) to identity the functional floodplain and areas of sustainable development
  • Survey of ground levels, watercourses and hydraulic structures within the catchment
  • Identification and design of sustainable drainage solutions
  • Negotiation with the Environment Agency, Lead Local Flood Authorities (LLFA) and other Drainage Authorities
  • Percolation Testing
  • Technical assistance to understand surface water flooding (e.g., drainage exceedance modelling to determine flood volumes, velocities and mapping of flood flow routes)
  • Flood risk advice
  • Preparation of Flood Warning Evacuation Plans
  • Computer modelling of drainage networks including sewers and watercourses using WINDES or Flood Modeller

Examples of Our Work

Liverpool Road, Formby:  A Flood Risk Assessment, Drainage Strategy and Hydraulic Modelling report for a 304-unit residential development. Work included hydraulic modelling using Flood Modeller software to determine the floodplain extent associated with the local watercourse network as well as detailed swale modelling using WINDES software in order to provide a viable and cost-effective SuDS solution for the site.

Meadow Lane, Trentham: A Flood Risk Assessment, Drainage Strategy and Hydraulic Modelling report for a 276-unit residential development. Work included hydraulic modelling using ISIS software to determine the floodplain extent associated with Newstead Brook, raising a flood map challenge with the Environment Agency to alter their ‘Flood Map for Planning’ and compensatory storage proposals.

Arlesey Rail Station Car Park: A Flood Risk Assessment for a new 400 space car park (using HEC-RAS modelling) and development of a Sustainable Drainage Strategy incorporating tanked permeable pavement.

Stirling Way Industrial Estate, Peterborough: A detailed study of the existing flood sensitive site using MIKE 11 (River Modelling Software) to determine the height and impact of proposed flood defences. More…

Retail Development, Chelmsford: A Flood Risk Assessment for a major town centre retail scheme, to demonstrate that the development would not increase flood risk in the locality.

Ambrosia Creamery: A feasibility study and preliminary design relating to the implementation of a flood defence scheme to protect the factory site from overtopping of the River Lyd. More…

Wapping High Street, Tower Hamlets: A Flood Risk Assessment for proposed development comprising 60 residential units. More…

Contact Us

Contact us to speak to one of our experts

Simply fill in our online contact form and we will get back to you as soon as possible!
Contact Us