Exploring the best management practice of urban drainage system in Chung Ho and Yung Ho Districts
Date Issued
2014
Date
2014
Author(s)
Ho, Mei-Hua
Abstract
Due to the raising population and extreme rainfall, urban flood becomes a severer problem. In Taiwan, the rapid increase of impervious surface area raise the probability of occurrence of urban flooding and enlarge its influenced area. For example, Typhoon Megi, Typhoon Fanapi and 0612 strom events all caused severe floods in recent years. In high-density urban, building more storm sewers has limited effects on improving flooding conditions .Therefore, in recent years, the Water Resources Agency and the Ministry of Interior try to use low-impact development techniques to reduce the chance of flooding. LID emphasizes on maintaining or restoring the site hydrological conditions back to predevelopment. And its strategy is combining distributed, parallel connection and small-scale devices functioning as infiltration, interception, rainwater storage or detention facilities to increaseinfiltration chances for runoff. The common LID facilities include rain gardens, vegetative swales, green roofs, permeable pavement ... and so on.
Study area was chosen as Chung Ho and Yong he District, New Taipei City. Through the SWMM model to establish the drainage system model, and set several scenarios that include the LID facilities strategy, detention pond strategy, storm sewer strategy and integrated strategy. Then use the results of surface runoff and excess overflow to evaluate the effectiveness of strategies, and estimate the project''s cost .Finally, compare the cost-effectiveness of each strategy as a best management measures reference.
The results show that under the same cost, best management practices should be adopted detention ponds, storm sewers, permeable pavement, bio-retention cell with each other. The effect is not only superior to the traditional
approach to build a large storm sewer, but also has benefit of landscape, ecology, green, slowing the urban heat island effect ... etc.
Subjects
低衝擊開發(LID)
最佳管理措施(BMP)
SWMM
透水性鋪面
Type
thesis
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