A SEMI - DISTRIBUTED HYDROLOGICAL MODEL IN HUMID TROPICAL CLIMATE USING MALAYSIA SOIL DATA

The idea of watershed modeling is implanted in the interrelationships of geospatial and hydro - meteorological data and represented through mathematical abstractions. The behaviour of each process is controlled by its attributes as well as by its interaction with other processes active in the catchme nt. In recent years, distributed watershed models have been increasingly used to implement alternative management strategies in the areas of water resources study. Many of these models share a common base in their endeavour to incorporate the heterogeneit y of the watershed and the spatial distribution of topography, vegetation, land use, soil characteristics and rainfall. For soil maps, all the physical properties were used as input files for SWAT models. The study attempts to assess the whole simulation p rocesses of the SWAT hydrological model using a Malaysia soil data. It was found that the SWAT model can be successfully applied for hydrological evaluation of the Langat River B asin with the coefficient of determination, R2 value of 0.7529. Finally, the p aper concludes by identifying key issues and gives some directions for future research