Department for Infrastructure (DfI) Rivers Directorate – Technical Guidance Note 36 – Flood Modelling Requirements to Support a Flood Risk Assessment.

The Rivers Directorate Technical Guidance Note 36 (TGN 36) provides guidance on flood modelling requirements to support a Flood Risk Assessment (FRA). It sets out the process to follow when producing a hydraulic model to support FRAs for DfI Rivers including the information required, the standards to be applied, and the steps to be taken when assessments are deemed acceptable or require further information or revision.

DfI Rivers Directorate provides flood hazard and flood risk information to inform planning and development decisions. As part of this role, FRAs are submitted by applicants and