Morphometric analysis for delineation flood hazard zone of Batang Padang catchment, Perak, Peninsular Malaysia

In the present study, flood hazard zone is identified by morphometric analysis of Batang Padang catchment, Perak, Peninsular Malaysia using remote sensing and GIS techniques. Survey of Malaysia topographic map and ASTER GDEM is used for the study and Geographical Information System (GIS) is used for the delineation of linear, aerial and relief aspect of the seven sub-watersheds (SW) of the catchment (350.47 km2 area). Horton (1945) stream ordering method was used for stream ordering of the catchment. The analysis has revealed that the total number of stream segments is maximum in first order streams and decreases as the stream order increases but deviation behaviour in stream length except in two sub-watersheds. Variation in bifurcation ratio, high drainage density, dendritic drainage pattern with fine texture, high stream frequency, low drainage intensity, steep slope, form factor, circularity ratio and elongation ratio were determined which indicate that the area falls under high flood zone. Furthermore, on the basis of above analysis a flood hazard zone map also developed.