A Study of Building Rainwater Permeation and Catchment Planning－The Case of “Public Building Courtyard” in Ka-Lu-Lan District, Taitung
Date Issued
2005
Date
2005
Author(s)
Chan, Dar-Fa
DOI
zh-TW
Abstract
Due to the global deficiency of water resources, most countries probe into design techniques and building site rainwater preservation and recycling techniques, in order to maximize water preservation and to effectively preserve and recycle permeate water resources.
Taiwan has an annual precipitation of 2510 millimeter, theoretically, water resource should not be a problem; but due to the precipitous topography, short but rapid river flow, water preservation is not an easy task. According to past statistics, only approximately 18% of the total annual flow rate can be preserved. Moreover, an uneven distribution of rain between rain and dry seasons in the past years, over-developed land, and wide use of impermeable materials, have contributed to the cause of two major problems, floods and water shortage, that often occur alternately.
Traditional courtyards usually have the function to modulate the microclimate where the building is located. This traditional technique is lost through inadequate development hindering the natural water cycle, and is one of the major reasons to cause urban heat island effect and floods in urban area.
This study will discuss the German eco-community, the city of Kronsberg as presented in EXPO 2000. The new German rainwater process systems presented by the above mentioned city, are a manifested design concept of site water catchment, preservation and recycle system, which altered the past drainage design concept, and the design enables permeate water recycling, water storage among other functions. This new concept is very effective for increasing rainwater infiltration in domestic courtyard constructions, reducing the surface water runoff, improving rainwater recycling, and hence to bring about a further multiplicity in reuse.
In order to accord with the promotion of domestic green building design concepts, this study will probe into the layout of courtyard permeation and catchment system, but also implementing actual projects to try to result with a feasible design model to including the following six aspects: pavements, gutter, maintenance well、permeation reservoirs、landscape water pool、rainwater catchment pool and recycle system.
Finally, the study includes an assessment of the relevant contents promulgated by the government in its green building design site water maintain index (modified version of 2003), to further discuss and examine legality and benefits of maintaining site water. The evaluation resulted that it not only accord with the law, but exceeds it. In addition, after the construction finished, the site experienced typhoon and heavy rain conditions, and results show that this system has sufficient permeation and catchment functions, hence assures the practicality and feasibility of the recommended model. The purpose of this study is to serve as reference guideline for the future planning and design projects for industry and academic circles in Taiwan.
Subjects
基地保水
雨水儲集系統
溢流設計
水循環
Rainwater storage in building site
rainwater catchment system
overflow design
water cycle
Type
thesis
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