Prediction of Streamflow and the Effect of Input Parameters in Small Urban Catchments

The importance of prediction of streamflow or hydrological cycle in new town development project for ecosystem and human activity along the river front is gradually increasing in Korea. For the streamflow prediction of natural catchments, much kind of conceptual hydrologic models were developed and applied successfully with few parameters in gauged catchments [Perrin et al., 2001] and much of papers are focused on the objective function and optimization method.In the case of new town development, especially highly developed and ungauged area, the optimized parameters of the conceptual lumped model could not describe the changes of topography, land use, soil type and it is difficult to predict the streamflow changes.Therefore, the authors use a distributed hydrologic model, WEP (Water and Energy transfer Process model, [Jia et al., 2001] and WEP+ (Pre and Post Processor of WEP, [KICT, 2006]) for assessing surface and groundwater flow variations after new town development.