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Flood Map for Surface Water 1:30 Rainfall (AfA177)
19 December 2013
Flood and Coastal Risk Management - Incident Management.
Flood Map for Surface Water 1:30 Rainfall dataset is the second generation Surface Water Flood Maps shows areas susceptible to flooding from overland flow before the runoff enters any water course or sewer. Usually associated with high intensity rainfall (typically >30mm/hr) resulting in overland flow and ponding in depressions in the topography, but can also occur with lower intensity rainfall or melting snow where the ground is saturated, frozen, developed to otherwise low permeability. Surface water flooding does not include sewer surcharge in isolation but these maps do account of surface water drainage systems as appropriate. This is a spatial dataset.