Revisions to EA Climate Change Allowances
In July 2021, the Environment Agency (EA) revised their previously published climate change allowances.
Using UKCP18 projections, the EA update the peak river flow allowances basing them upon management catchments rather than river basin districts as was previously the case. Management catchments are sub-catchments of river basin districts.
The EA have also revised their guidance on how to apply the river basin flow allowances within Flood Risk Assessments and have simplified their approach. The majority of assessments will now only need to consider the ‘central allowance’. The central allowance should also be able to calculate flood storage compensation, except where essential infrastructure is affected.