Coastal Change Management Areas (CCMAs) – Methodology and Adoption Reports

This report provides a review of existing CCMA uptake in England with analysis of the approach and methods adopted to achieve the designations. Broadly speaking, CCMAs are designated as required for regions, within the Shoreline Management Plan (SMP), classed as No Active Intervention or Managed Realignment (NAI/MR) and rarely for Hold The Line (HTL), in-line with NPPF guidance.
A review of approaches within England show methods of CCMA designation driven by a dominance of SMP and EA flood zone input with additional “buffers” applied to provide more conservative boundaries. While there is some variability in “buffers” applied to CCMAs, the underlying approach is to adopt the most recent SMP guidelines/erosion rates.

WP2 presents approaches to CCMA development using two case studies in the Taw-Torridge Estuary and East Devon as examples to explore the types of data available and the role they play in developing a CCMA.

The report provides details of the digital GIS files supplied in support of this document. Some discussion on the specific regions is provided, however, the focus is on an explanation of different files that are provided to delineate the short (20 yr) medium (50 yr) and long term (100 yr) likely coastline positions as generated following the methodology outlined in WP2 Version 2 report. For erosion dominated coastlines three epochs are predicted and associated ‘buffers’ for each coastline are also supplied. For inundation/flood dominated coasts the 1:200 yr level (including sea-level rise) is used to generate a single region with additional ‘buffer’ lines also provided to accommodate coastal paths and mapping accuracy.