Investigation of Flood Warning Standard in Urban Areas
Date Issued
2014
Date
2014
Author(s)
Chiang, Cheng- Cheng
Abstract
In this study, a new flood warning standard (FWS) is proposed to fulfill the flood prevention demand of the government. The sizes of flood inundation areas are determined by rainfall durations, terrain, water conservancy facilities and river levels. For the purpose of investigating the effect of river levels at the outflow boundaries and rainfall durations on the flood inundation area, the Wayaogou drainage channel basin is adopted as a study region which is located in the Zhonghe and Yonghe Districts in Taiwan. Various river levels at the outflow boundaries and various rainfall durations are used to conduct the flood inundation simulations to find flood inundation areas of the study region. The ratio of the flood inundation area and the total area of the study region exceeding 5% is viewed as a warning criterion. Based on the criterion, different combinations of river levels at the outflow boundaries and rainfall durations are provided in the new FWS. Comparing with the original FWS established by the Water Resources Agency (WRA), the new FWS involving the factor of river levels at the outflow boundaries in addition to the factor of rainfall durations is more reliable on preventing the occurrence of disaster.
Subjects
淹水預警
淹水警戒
淹水模擬
都市淹水
SDGs
Type
thesis
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