Climate change influences over years clearly can affect a catchment area in terms of
quantity and quality of water. High annual rainfall in Malaysia does not solve water
scarcity problems during the El Nino phenomenon and can cause severe flooding
during La Nina. A simulation from year 1980 to 2006 has been done at Sg. Ketil
streamflow station at Kuala Pegang, Kedah in the North region of Malaysia according
to availability of data. The monthly streamflow later has been calibrated and validated
using SWAT-CUP. Water level data was obtained from an inventory water level station
recorded at the station. Land-use, soil type and slope are taken account to produce a
number of hydrologic response units (HRU). This study used developed gridded daily
hydrometeorological data set for Peninsular from 1980-2006using interpolation
technique. The results shown that the calibrated model is able to simulate the flow for
the river basin successfully with the R2
= 0.65 and NSE=0.52 and validated value of
R
2=0.5 and NSE=0.43. A recommendation is purposed to simulate the catchment using
hydrometeorological data set in the stations located in the area to compare the results
for further study.