## 4 Results
### Hydrological Assessment
\begin{table}
\begin{tabular}{c l c c c c c c} \hline \hline
**No** & \multicolumn{2}{c}{**Parameter Name**} & \multicolumn{2}{c}{**Parameter**} & \multicolumn{2}{c}{**Original**} & \multicolumn{2}{c}{**Final**} & \multicolumn{2}{c}{**Fitted**} \\ \hline
1 & \multicolumn{2}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} \\
2 & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} \\
3 & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} \\
4 & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} \\
5 & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} \\
6 & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} \\
7 & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} \\
8 & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} \\
9 & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{}{} \\
10 & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} \\
11 & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} \\
12 & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} & \multicolumn{1}{c}{}{} \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Soil and Water Assessment Tool (SWAT) parameters (*1 most sensitive based on final range). Figure 6 shows the temporal variability and statistical analysis of the SWAT monthly streamflow using the gauge and the three IMERG products. The results show that all the precipitation products had a better performance in the monthly streamflow simulation compared to the daily streamflow simulation. The IMERG_F is the only product that categorized a \"very good\" performance, with NSE, R\({}^{2}\) and RB values of 0.86, 0.9 and \(-\)7.1%, respectively. In addition, the IMERG_E outperformed the IMERG_L in the monthly streamflow simulation, indicating the reprocess scheme within the IMERG_L is less beneficial in this tropical basin. Similarly, the IMERG_E and IMERG_L showed a significant underestimation of SWAT monthly streamflow by 28.3% and 36.6%, respectively.