In response to the challenges of extreme climatic conditions, various countries have used fluvial geomorphology to determine the extent of fluvial corridors, areas where a river is allowed to move freely and display its processes of sedimentation and erosion. This study proposed a procedure for demarcating Taiwan’s fluvial corridors.Four boundaries mapping area of historical channels, area of potential occupation, area prone to deposition, and area prone to inundation are used to determine the extent of fluvial corridors. The corridors can then be subdivided into zones of erosion, deposition, and inundation for management purposes. The Wu River and the Zengwen River were used as examples for determining the extent of fluvial corridors and suggestions were made to improve their floodcontrol measures. The recommended procedure of mapping and subdividing fluvial corridors can be used in flood control planning to allow river adequate space for energy dissipation, minimize cost on flood-control works, while enabling the river to provide its valuable eco-system services.
Key Words: Fluvial corridor, fluvial morphology, river planning