Integrated rainfall-runoff simulation and factorial analysis approach for watershed systems modeling under uncertainty

A hybrid rainfall-runoff model was developed to simulate the extreme rainfall event in the Swift Current Creek Watershed in Canada. The influence of five uncertain hydrological parameters on modeling outputs was evaluated through factorial analysis. The results show that variations in overland flow runoff coefficient (CQOF), root zone threshold value for overland flow (TOP), and root zone threshold value for inter flow (TIF) have significant effect on peak flow; and variations in maximum water content in root zone storage (Lmax) and root zone threshold value for inter flow (TIF) have highly significant effect on accumulated water volume.