2.4 Disaster vulnerability factors
Reviews of disaster vulnerability factors, found that the most
crucial factors may be organised as six groups of factors which are:
topography, slope, density of building, distance from the river,
drainage system & soil type, and distance to road. Topography
refers to current elevation and surface water flow paths [12-16].
Slope refers to upstream source of flooding, flood susceptibility
and overflow sensibility [13, 15-16]. Density of building refers to
land value per floor space and land use [12, 14].The distance from
the river refers to area flooding risk [12, 14-16]. Drainage system &
soil refer to vulnerable community and critical, soil erodibility, soil
drainage, soil moisture, soil scape in fragile environmental balance
and soil composition [12-15]. Distance to road refers to distance of
historical sites to road [12, 15-16].