How to create a property damage shapefile

1. You will need a point shapefile or csv format text file that represents your property data. This can be added to your project if it is a shapefile (also csv files can be imported as new shapefiles), however it is not essential as you will have the option to browse to this file later in the process.

   Two main sources of property data available for use in flood and coastal erosion risk management in England and Wales are:

   • National Property Dataset (NPD).
   • National Receptor Dataset (NRD) Property Points Layer.

   

2. If you have not pre-selected a property shapefile (from your main Flood Modeller interface) then you need to use the adjacent browse button to specify either a shapefile or csv format file.

   

3. Select your depth damage data source. This is the database defining the depth damage relationship for each property type.
   Guidance on how to define new depth damage datasets is available elsewhere in the user guide.

   Note also that the selected data will represent particular attributes of flooding. These are:

   • Year data was defined, e.g. MCM data are revised annually.

   • Flood duration, e.g. 12hr or 36hr.

   • Warning – different damage curves are used to represent no warning, <8hr warning and >8hr warning.

   • Saline – damages can vary if flood water is saline.

   • Sewage – damages can vary if flood water is contaminated.

   • With / without cellars – damages can vary if cellars are considered for certain property types.

   • Wave – tidal flooding can vary damages due to wave affects (effectively increasing flood depths)

The database is selected on the settings tab of the Damage Calculator interface. A button is provided to browse to your damage database.