3.1 Model Calibration Results (1999-2000)
During the calibration period, the model simulated flows that matched observed flows with moderate accuracy. The simulated flows were substantially overestimated for 1999 but quite accurately predicted for 2000. The predicted peak discharge closely matched observed values in 2000, differing by only 0.2% but overestimated by 84% in 1999. The simulated monthly flows from the SWAT model reached the high value of both R2 and the ENs -- more than 0.8 (R2=0.805 and ENs=0.848). The scatter plot for model calibration (Fig. 3a) showed the uniform scatter of points above the 1:1 line for low flows, while for the peak flow it plotted very close to the 1:1 line.