Do I Need a Flood Risk Assessment?

The answer to this question depends on your proposed development site's size and its location.


If the proposed development site is over one hectare in size and located within Flood Zone 1 and for all proposals for new developments located in Flood Zones 2 and 3 a Flood Risk Assessment is required.


If the proposed development site is considered to be located in a low to medium risk area and it falls in the upper end of the probability range (i.e. close to 0.5% which equates to a flood risk of 1 in 200 years) or where the nature of the development or local circumstances indicate heightened risk a Flood Risk Assessment is required.

For all proposed developments within the Scottish Environment Protection Agency Flood Zones (1 in 200 year or greater chance of flooding) a Flood Risk Assessment is required.


If the proposed development site is located within Flood Zones C1 or C2 then a Flood Consequence Assessment is required. In Flood Zone B a Flood Consequence Assessment may be required with the level of detail dependant upon the location and whether the site is outside the extreme flood event extents (1:1000 flood event).


In all cases, the assessments undertaken are specific to each site and may be a screening study  (Level 1) through to a detailed quantitative flood risk report (Level 3) and may include existing drainage system assessment, watercourse modelling and flood defence Breach Analysis where specifically required .

Our expertise extends through to design of flood alleviation schemes for proposed developments, including flood wall attenuation ponds and dry basins to mitigate against the risk of flooding to both a proposed development and existing development where required.

Request a Fee Proposal

We would welcome the opportunity to provide you with a competitive fee proposal, simply call Sanderson Associates on 01924 844080 and ask to speak to a member of our Flood Risk Team or click here to complete our secure online form.

Flood Risk Assessment, Flood Consequence Assessment Flood Zone 1, Flood Zone 2, Flood Zone 3 Risk Area, Flood Zone C1, Flood Zone C2, Flood Zone B