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The Damage Calculator helps you to quickly assess the overall economic impact of flooding on a catchment, allowing you to better understand the severity of a flood event. It also allows you to calculate risk to life data.

The tool uses data on flood depth, property location, property type and depth-damage curves to estimate direct property damages. The method used in the calculations is based on the Multi-Coloured Manual (Penning-Rowsell et al, 2005).

Flood Modeller Pro’s Damage Calculator produces results in CSV format, which can be easily loaded and viewed in Excel or a similar spreadsheet package. The tool compliments your flood modelling, providing an efficient way to quickly analyse economic impacts from multiple, different flood scenarios.

Data is calculated both as overall totals for a measure of overall impact and at a per property level, enabling identification of the properties impacted the most by each flood scenario.

Useful tip: It should be easy to import the Damage Calculator CSV outputs into GIS software as a point Shapefile to enable you to locate the most impacted properties.

How to use the Damage Calculator

Before the Damage Calculator can be used, your data needs to be prepared (detailed here).

The tool can be accessed within Flood Modeller Pro via: Toolbox > Post-Processing Tools > Damage Calculator and is easy to use. If you have your depth grids (in ASCII format) loaded in your Flood Modeller Pro map view, then you will be prompted to automatically load any selection of these into the Damage Calculator interface upon start-up. Alternatively, you can browse to your depth grids from within the Damage Calculator interface.

If you have multiple depth grids loaded for analysis in Damage Calculator then you will need to specify a return period for each grid. You then have the option to also calculate an annualised average damage (AAD) for each property in your property dataset.

Use the provided browse buttons to specify the property dataset and depth damage database to utilise in your analysis. For the latter you can select a specific curve set if your database contains multiple curve sets, e.g. for different flood durations.

Your damage analysis can then be run, after which the results are loaded into the Damage Calculator interface for inspection (in the Results and Output Log tabs). Functionality is provided to export this data into Microsoft Excel as CSV format.

The Damage Calculator user interface also provides options to calculate damages above a specified depth threshold or with an uplift factor applied for salinity.

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