A GIS-based framework for flood hazard vulnerability evaluation in Thudawa area, Sri Lanka.

Abstract

Tue objecti,·es of our research were identifying and classifying flood risk areas into different classes in Thudawa area, Sri Lanka, and developing a geographical infonnation system (GIS) model to identify flood nilnerability areas accurately in Thudawa area. It was e:tpec.ted to propose pre,·enrive guidelines of flood hazard vulnerability using geo-informatics. The methodologic-al procedure is extremely imponant in this type of researc.h thus, the spatial multi-criteria decision analysis (MCDA) procedure "·as used. For this research, analytical hierarc.hy process {AHP) ,vas used for the criterion weighting. AHP calculations nm upon the results of esperts • judgment as proposed by the Satty incorporating pair-"ise comparison method. The results of this study attempt to analyse the existing flash flood risk levels using the GIS-based multi-criteria analysis technique wbic.h allowed ranl.Ug of risk areas sinc.e it is important in the decision-making proc,ess to mitigate the flood risk in the study area.