Design of Ecological Flow (E-Flow) Considering Watershed Status Using Watershed and Physical Habitat Models

Ecological flow (E-flow) determination is an essential component of stream management and the preservation aquatic ecosystems within a watershed. E-flow should be determined while considering overall status watershed, including hydrological cycle, hydraulic facility operation, ecology. The purpose this study to determine by watershed through coupled modeling with SWAT PHABSIM. was calibrated ensure reliability when coupling two models, using observed data that included streamflow dam inflows. calibration result showed averages R2, NSE, RMSE were 0.62, 0.57, 1.68 mm/day, respectively, showing satisfactory results. Flow duration analysis results performed apply discharge boundary conditions for Q185 (mid-range flows) Q275 (dry conditions) suitable simulate fish habitat. habitat suitability index derived survey applied PHABSIM estimate E-flow. estimated at 20.0 m3/s model compared notified instream Ministry Environment. demonstrate high level applicability approach between physical simulation models. Our attempt can utilized status.