The Weighted Annual Average Damage (WAAD) Estimation Tool

This “ballpark” estimation tool can be used if you have little or no understanding of the techniques of flood loss assessment and if you have no data for calculating the potential flood losses.  The tool provides an indication of the potential annual benefits (or avoided annual flood losses) provided by a flood defence scheme for residential and non-residential (commercial) properties only.   

Click on the Image below to download the tool as an Excel spreadsheet (1.6mb)

Warning: This is average data and may not be a true representation of a flood event at your locale.  We do not recommend using it at a detailed scale (e.g.. street level).

A more complex calculator and cost-benefit analysis case study

Level 3 provides a more complex benefits tool, incorporating all of the stages in calculating the benefit:cost ratio and other indices of scheme worthwhileness.

The same section gives a deeper understanding of the CBA process in the form of a “walk through” case study, based on a genuine appraisal for Filey in North Yorkshire.  See Level 3 for further details.

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