Innovative Design and Application of Rainwater Harvesting System to Control Stormwater Runoff

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Project title

Code/計畫編號

MOST104-2221-E019-030-MY2

Translated Name/計畫中文名

考量雨洪削減效益的雨水貯集系統設計與應用

Project Coordinator/計畫主持人

Chao-Hsien Liaw

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Harbor and River Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=11570003

Year

2015

Start date/計畫起

01-08-2015

Expected Completion/計畫迄

01-07-2016

Bugetid/研究經費

824千元

ResearchField/研究領域

土木水利工程

"台灣降雨時空分配不均及都市化造成的洪澇問題，使都市雨洪問題備受重視。雨水貯集不但能收集雨水供家庭、學校或機關等使用，舒緩缺水壓力，還具降低都市逕流體積與洪峰流量之功能，舒緩都市洪澇問題。然而，傳統雨水貯集僅以供水為主要目的，國內外目前尚無雨水貯集系統同時考慮供水與防洪雙重標地之設計規劃。本研究之主要目地是將雨水貯水設施視為一小型滯洪池，探討雨水貯集系統在設計的改變包括排水孔口設計及滯洪容量使其具防洪功能及建立建築、社區及區域尺度降雨逕流模式，進而評估雨水貯集系統之減洪效益，期能建立分散式都市雨洪管理模式。研究擬分二年度完成：第一年(104.08-105.07) 擬彙整分析國內外有關雨水貯集系統供水與防洪之研究，首先建立不同型式滯洪排水孔口出流量公式，並利用不同設計條件(設計暴雨及雨季實際暴雨) 優選比較雨水貯集系統滯洪排水孔口型式與滯洪體積，進而建立建築及社區尺度降雨逕流模式評估長期供水、防洪效益，並以此模式評估不同降雨地區之設計條件。第二年(105.08-106.07)延續第一年的研究成果，進一步建立雨水貯集系統考慮滯洪體積下對不同屋頂面積之逕流係數削減之理論公式，並與模擬值比較，進而結合SWMM 模式建立社區或區域之降雨逕流模式，評估社區或區域設置雨水貯集系統之減洪效益。進而結合雲端技術建置雲端資料庫並連結模式運算，提供便捷的操作計算及防洪成效評估平台。" "In Taiwan, urbanization and uneven distribution of rainfall in space and time cause urban flooding problems. In recent years, urban stormwater management issues have been raised attention by general public. Rainwater harvesting systems not only collect rainwater for homes, schools, offices, etc. but also mitigate the urban flooding problem in reducing the runoff volume and peak flow. However, the main purpose of traditional rainwater harvesting system is mainly for water supply. In both domestic and abroad, there is limited research concerning design methodology in rainwater harvesting systems to consider both water supply and stormwater mitigation benefits. The purposes of this research are to treat rainwater harvesting system as a small detention pond and investigate the design alternation of rainwater harvesting system in both opening orifice type and detention volume. Therefore, the rainwater harvesting system has the functions of both water supply and stormwater mitigation. Then rainfall runoff models for the scales of building, community and regional scales will be developed. These models will be used to evaluate the benefit of stormwater mitigation for long- term. At the end, the decentralized approach for urban stormwater management will be established. This study takes two years: In the first year (104.08-105.07), literature review is required focusing on rainwater harvesting system for water supply and urban stormwater mitigation. Firstly, discharge equations for different types of opening orifice will be established based on pipe flow equation. And the detention orifices types and detention volume will be analyzed and determined based on designed storm and rainfall record in wet season. Then rainfall-runoff model for building and community scales will be established to evaluate the long-term benefits of water supply and stormwater mitigation. The methodology developed above will be applied to different rainfall zones. In the second year (105.08-106.07), the results of the first year will be used and promoted. The theory formula for estimating the runoff coefficient of installing rainwater harvesting system with detention capacity for different capacities and roof areas will be developed and compared with the simulation results. Then rainfall runoff simulation model for community scale will be also established. To evaluate the stormwater mitigation benefit of regional level, SWMM will be used, establish for evaluating the effectiveness of stormwater control. Using the results combining cloud technology, this study will build cloud computing database and link model, provide the convenient platform for effectiveness evaluation of urban stormwater mitigation."

Keyword(s)

水資源管理
雨水貯集
雨洪削減
低衝擊開發
SWMM
雲端運算
water management
rainwater harvesting
stormwater reduction
low impact development (LID)
SWMM
cloud computing

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Innovative Design and Application of Rainwater Harvesting System to Control Stormwater Runoff

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