An Improved Design of Fishways Under High Variation of Headwaterby Kuo-Cheng Hsieh, Dep of Hydraulic Engineering, Taipei, Taiwan,
Sue-Jen Wu, Dep of Hydraulic Engineering, Taipei, Taiwan,
Che-Yuan Huang, Dep of Hydraulic Engineering, Taipei, Taiwan,
Abstract: For the purpose of mitigating environmental impact, it is necessary to build fish passing facilities for fish migration when a dam is constructed on a river. But when the headwater variation is sufficiently high, it is generally difficult to design a fishway which is both economic and free of manual operations. Two categories of fishways are usually applied when the headwater elevation is varying. One is the mechanical fishway, the other is the vertical slot type fishway. However, when the headwater variation is too high, only the mechanical one is applicable. The fishway design of the Sulin dam, which is located in a remote area in Taiwan, is discussed in this paper where the headwater variation is 7 m. Since the mechanical fishway needs high construction budget and maintenance fee as well as labor forces, it is not economical and not suitable for this dam site. Hence, the vertical slot type fishway, which is originally not appropriate in this case study, is reconsidered. By some modifications in the layout, the vertical slot type fishway becomes applicable in Sulin Dam. The suggested design not only saves a lot of budget but also is free from labor operations.
Subject Headings: Fishways | Hydraulic design | Fish management | Budgets | Construction sites | Economic factors | Taiwan | Asia
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