A Study on the Utilization of Flood Plain
The recent economic developments has improved living standards of residents in Taiwan, and therefore a better environmental quality has to be promoted accordingly. Due to limited land sources and high land costs in Taiwan, the utilization of flood plain as recreational area is urgently needed. However the utilization of flood plain is often limited by law that any activities causing flow retardation are prohibited. This article recommends to use the excessive free board for the increase of water surface elevation caused by flood plain utilization under the condition that flood safety shall be maintained. A safe free board is defined in this article as V2/2g for straight reaches and 1.66V2/2g for reaches with gradual bend, and allowable flow velocities are suggested for flood plain utilization based on existing free boards. This article further provides methods of calculating allowable density for planting and recreational facilities as well as calculating roughness coefficients after flood plain utilization. The study results could be used as a tool for planning of flood plain utilization. Hopefully, the conflict between flood plain utilization and the limitation of flow retardation could be resolved.
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