| dc.description.abstract | Flood is one of the disaster threats downstream of Welang river, Pasuruan. A flood
susceptibility map is needed to anticipate floods disasters. This research aimed to map flood
Susceptibility in the Welang watershed using a Geographical Information System. In
determining flood hazard, the Frequency Ratio (FR) approach was used. Flood locations were
identified from the interpretation of field survey data as training data and model validation. The
data were represented in a Digital Elevation Model (DEM) map, geological data, land use, river
data, and Landsat Satellite Imagery and processed into a spatial database on the GIS platform.
The factors that caused flooding consisted of Flood inventory, slope, Elevation, Topographic
Wetness Index (TWI), Standardized Precipitation Index (SPI), Flow Accumulation, Distance to
the river, River Density, Rainfall, Vegetation Index (NDVI), and Landuse. The map results with
acceptable accuracy showed that the FR model gained an Area Under Curve (AUC) value of
90%, and the incidence for the Area Under Curve ( AUC ) was 93%. It is known that 1% of the
flood-prone area is very high. The local Government can use the research to minimize the risk
of flooding in the Welang watershed. | en_US |
