Statistical Indicators Calibration Period (1999-2003) Validation Period (2004-2005) Observed Simulated Observed Simulated Mean (m3/s) 33.41 33.95 33.80 33.67 STDEV (m3/s) 37.90 34.15 46.34 42.98 MAE (m3/s) 9.70 10.33 RMSE (m3/s) 19.73 28.9 NSE 0.88 0.80 R2 0.87 0.81 P-factor (%) 0.87 0.99 R-factor 0.59 0.55

Table 3: ArcSWAT model performance statistics in simulating daily streamflows.