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This document is for flood risk management authorities including:
lead local flood authorities (LLFAs)
internal drainage boards
any person involved in developing surface water flood mapping on their behalf
The updated flood map for surface water will combine local detailed mapping with
national mapping to form a single source of surface water flood mapping for England and
The document outlines the differences between the updated national scale surface water
mapping and previous national scale surface water mapping. It describes how LLFAs can
check if their mapping is compatible to be included in the updated flood map for surface