Figure 11: Flood forecast variability expressed by BIAS with catchment scale and characteristic. Red, blue, and gray points represent the small catchment (<200 km2), medium catchment (200~1000 km2), and large catchment (>1000 km2), respectively. And we also divided catchment characteristics into 2 types, mountainous area (>800 m, big point) and flat area (<800 m, small point) considering average elevation (800 m) of the 33 subcatchments.