Separation of surface flow from subsurface flow in catchments using runoff coefficient

Separating surface flow (SF) from subsurface (SSF) based on direct runoff measurements in river gauges is an important issue hydrology. In this study, we developed a simple and practical method, coefficient (RC), for separating SF SSF. RC depends mainly soil texture, land use cover, but also considered the effect of slope rainfall intensity. We assessed our RC-based method three different types by comparing value obtained with laboratory simulator data. The correlation between observed calculated data exceeded 0.93 0.63 when estimating SSF, respectively. was then used to separate SSF two catchments (Heng-Chi San-Hsia) Northern Taiwan, results were compared those produced geomorphological instantaneous unit hydrograph (GIUH) model. Test revealed that, if accurately, proposed can satisfactorily at catchment scale.