I have a series of depth-damage functions to estimate damages caused by river flooding. I would like to use these functions as proxy to assess coastal flood damages. We know that damages caused by salt-water will be higher (due to salt content, intrusive water, soil quality lost, etc.). I am looking for specific figures relating damages caused by river and coastal flooding.
The Multi-Coloured Manual, Published by Flood Hazard Research Centre at Middlesex University might be a good place to start? It is, I think, UK based but you can probably extrapolate to some extent.
For actual costs i would consider contacting the insurance companies, they will have very specific data on claims due to flooding. The data may have to be processed and added to but i would be an excellent starting point
Rodrigo, there are two software packages that I'm aware of in the United States that are used for flood damage cost estimation. They are the Federal Emergency Management Agency (FEMA) Hazus software (http://www.fema.gov/hazus) and the U.S. Army Corps HEC-FIA (Flood Impact Analysis; http://www.hec.usace.army.mil/software/hec-fia/). Typically they take GIS-based property valuation data from local communities along with local topographic data and standard depth-damage curves to estimate flood costs. Perhaps looking into these models may help with your questions.
"We know that damages caused by salt-water will be higher (due to salt content, intrusive water, soil quality lost, etc.)." We found on a recent field survey that damage to property due to surge could be less than river flooding because the residence time of the water is much shorter and tends to recede with the tide after a few hours. In addition in many cases the water tends to deposit less sediment so cleaning costs are less.
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