| Summary: | 碩士 === 國立臺灣大學 === 生物環境系統工程學研究所 === 103 === Due to global warming, extreme climate change, the level in Southern Taiwan area is low and coastal area causes subsidence because of groundwater extraction when heavy rain come, for example, Typhoon and Plum rain season. Stream surge and over-flooding cause the heavy loss about property and life of residents.
In conclusion of these flooding disaster reasons, it can be understood that the easiest flooding disaster reason is the problem of plan, design, control, and management. These drainage facilities are maintained not well, designed bad, under the standard of flood protection. And this problem is 36.36% (48/132). The secondary one , hard discharging of inner water, is 21.97% (29/132). It is because of low-lying and bad congenital conditions in Southern Taiwan area, extreme climate changes the weather patterns, short precipitation, short rainfall duration, rainfall centralization, high intensity, and the higher peak discharge, the areas can not deal with excessive flooding instantly. The inner water can not discharge smoothly because of drainage facilities hard-working , let the large-scale flooding happen.
Comprehensive water management thinking, the core value is reducing the load of river. It can suffer larger flood events based on existing foundation. For the part of plan, the project embodiment of comprehensive water management strategy includes all the watershed , not part of rivers. And the strategies are flood mitigation, flood storage, and escaping.
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