Where the extent of present development is substantial, alternate strategies such as flood proofing can be considered. Flood proofing, a combination of long-term, non-structural and minor structural measures, as well as emergency actions, is important not only in reducing damage due to flooding, but also in preventing the negative impacts on the environment such as the spread of pollutants. It includes provision of quick drainage facilities such as the cleaning of primary and secondary drainage channels and clogged cross-drainage works before the onset of the flooding season.

Flood proofing measures include, among others, removing goods, equipment and harmful industrial, agricultural and domestic chemicals, beyond the area subject to flooding or out of contact with floodwaters, by constructing high ground or small embankments. Existing facilities for drinking water supply have the potential to get contaminated. The sewerage disposal and treatment infrastructure located in the flood plains can cause nuisance and spread of diseases and pollution, affecting the health of the population. Provision should be made for the protection of such infrastructure. (WMO 2006a)