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31/05/2018 10:36:20

The Damage Calculator tool is designed to estimate direct property damages (residential and commercial) caused by flooding. In addition, it can, at the same time, perform annual averaged damage (AAD), present value damage (PVD), effect of property level protection and risk to life calculations.

The tool takes inputs of series of flood maps (depth grids for different return periods and from different Epochs) and combines these with property datasets (providing property locations and metadata) and depth-damage curves to calculate the damage for each property affected directly by flooding. These data are then summed to obtain total damage figures for each flood event. Damage analyses can be output in spreadsheet or shapefile format.

The tool requires you to initially post-process your model results to obtain maximum extent depth grids in ASCII format (.asc), which can then be input and analysed in Damage Calculator.

In addition to calculating damages from a single model result, Damage Calculator can also process multiple results from the same Epoch to calculate AAD and multiple results from multiple Epochs to also calculate PVD. Furthermore, with the addition of flood hazard data inputs, damage analyses can also include risk to life calculations.

The tool has been significantly enhanced within Flood Modeller v4.4 and was developed in collaboration with the Flood Hazard Research Centre (FHRC), who are part of the University of Middlesex, UK. Their research provides property depth damage data for the UK Multi-Coloured Manual (MCM) in a format that can be used directly within Flood Modeller v4.4’s Damage Calculator, with these data now available to download from their website. Alternatively, you can generate your own depth damage data in the same format (for guidance, a sample is provided as part of the Flood Modeller example data). Furthermore, this format is described in the user guide at “How do I setup my Damage Calculator depth damage curve data”.

New features within Flood Modeller’s (v4.4) Damage Calculator, include:

  • Multiple depth grids can be analysed from a single Epoch to give an average annual damage figure (AAD)
  • Multiple Epochs can be specified (each containing 2 or more depth grid datasets) and the AAD values obtained can be used to calculate a present value damage figure (PVD)
  • Options are provided to specify appraisal period, interpolation method for AAD values over the appraisal period (stepped, linear or combined linear then stepped), discount rates (against time) and capping against market values for each property
  • The results table in the interface can now be customized. You can filter data, e.g. only show properties with damages > £100,000, re-order by a column, e.g. show properties with maximum PVD or AAD, you can group data by a user selected column and you can add or remove columns from the display
  • The data displayed in the results table (filtered or not) can be exported as a new point shapefile containing only the visible data as attributes. This export can be repeated to produce shapefiles with different content and you can automatically add these data to your Flood Modeller project map view as it is created
  • Select depth damage curve sets for residential and non-residential properties individually

For further information with regards to processing your flood depth grid model outputs to calculate likely damages to affected properties, including how to also calculate annual average and present value damage values (when you have multiple depth grid results), click here

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