台灣都市地區時常面臨乾旱缺水或颱風淹水等課題，所以都市之建築物需設置在乾旱時能蓄水抗旱、颱風暴雨時能蓄洪防洪的蓄水滯洪設施。根據相關研究與規範，現今新建建築物多已將筏基空間納入滯洪空間評估計算，以符合新法規之規定要求。未來國內新建建築物之筏基空間作為滯洪功能，並兼作雨水利用之空間使用勢將越來越普遍。惟建築物之滯洪功能與雨水利用操作，有其原理上之衝突情況，必須從基地所在位置全年旱季與雨季之分佈考量，並適度導入正確之營運管理操作模式，才能真正發揮建築規劃設計，亦達成筏式基礎貯集空間之防洪抗旱之功能。本研究依據既有文獻重新歸納分類雨水貯集與滯洪池合併設計系統，模擬雨水回收利用系統，並利用累加公式計算雨水貯集池之雨水累積量，再依據雨水收集面積與最適雨水貯集容積，建立建築筏基空間模擬運作模式，搭配地區性雨量之變化，達到有效利用滯洪池與雨水再利用之目的，以及評估各模式用於建築類型之節水效益。本研究成果包括：(1)經過資料蒐集與分析，有效歸納出建築筏基雨水貯集滯洪系統，可提供建築工程師之設計參考。(2)模擬運作模式，能提升建築物筏基空間的減儲洪效益，並提供各運作模式之表現及評估流程以供參考。(3)透過案例蒐集、分析，驗證各案例節水率提升之規劃策略，提供雨水替代效益分析結果於建築設計階段參考。綜觀本研究模式運算結果，透過增加集雨面積與貯集容積之方式，能有效提升雨水替代效益，並利用筏基空間貯集雨水及滯洪，較能有效利用於都市建築之雨水回收策略，以降低都市洪患與乾旱缺水的調供。

In Taiwan, urban areas often have water shortage issue during drought, and flood issue during the typhoon, that is the reason why the buildings in the urban area need to set the facilities which capable of storing water to resist the drought and flood control to resist typhoon storms. According to the relevant research and specifications, most new constructions have incorporated raft foundation spaces into the flood detention spaces for evaluation and calculation to comply with the new regulations, and this situation will become more common in the future. However, due to the fact that the principles of flood detention and rainwater use operations are in conflict with each other, it is necessary to consider the distribution of the dry season and the rainy season throughout the year from the site location and introduce the correct operation and management mode to truly achieve the benefits of architectural planning and design, and equip the functions of the flood control and drought resistance in the storage spaces of the raft foundation. Based on the literature, this study summarizes and classifies "rainwater storage and detention pond merge design system", simulates the rainwater recycling system, calculates the cumulative amount of rainwater in the rainwater storage pool by using the cumulative formula, formulates the "raft foundation simulation operation mode" according to the rainwater collecting area and the optimal rainwater storage volume. With regional changes in rainfall, achieves the effective use of the purpose of the detention pond and rainwater reuse, as well as assessing the water saving benefits of the various models for different building types. The result of this research includes: (1) through the data collection and analysis, the “raft foundation rainwater storage detention system” can be effectively summarised, which can provide a reference for the design of a building engineer; (2) simulate operation mode can improve the rainwater storage efficiency and flood detention effectiveness of the raft foundation space, and provide the performance and assessment process of each operation mode for reference; (3) collect and analyze the cases, to verify the planning strategies for improving the water conservation rate of each case, and provide the results of rainwater alternative benefit analysis for reference during the architectural design phase. Summarize the results of the mode operation in this research, the effectiveness of rainwater replacement can be effectively improved through the increase of rain collection area and storage volume, in addition, it can be effectively used of the rainwater recycling strategies for urban buildings by utilizing the raft foundation to store rainwater and flood detention, to reduce the urban water crisis due to floods and drought.

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