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Development of surface and sub-surfa...

Luu, Toan Manh.

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Development of surface and sub-surface hydrologic model for storm water infiltration practices.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Development of surface and sub-surface hydrologic model for storm water infiltration practices./
作者:	Luu, Toan Manh.
面頁冊數:	165 p.
附註:	Source: Dissertation Abstracts International, Volume: 76-09(E), Section: B.
Contained By:	Dissertation Abstracts International76-09B(E).
標題:	Civil engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3702079
ISBN:	9781321731729

Development of surface and sub-surface hydrologic model for storm water infiltration practices.
Luu, Toan Manh.

Development of surface and sub-surface hydrologic model for storm water infiltration practices. - 165 p.

Source: Dissertation Abstracts International, Volume: 76-09(E), Section: B.

Thesis (Ph.D.)--University of Colorado at Denver, 2015.

Urban development results in increases of runoff rates and volumes. Since the early years in 1970's, storm water detention has been recommended as an effective means to reduce the peak of flow generated from the extreme events. Through the years from 1990 to 2000, the renaissance of urban storm water management leads to a new era under the new concept of low-impact-development (LID). The LID approach is mainly developed to cope with the small, frequent storm events. With both flood mitigation and LID approaches, an urban watershed's hydrologic regime can be preserved.

ISBN: 9781321731729Subjects--Topical Terms:

860360
Civil engineering.

Development of surface and sub-surface hydrologic model for storm water infiltration practices.
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245 1 0 $a Development of surface and sub-surface hydrologic model for storm water infiltration practices.
300 $a 165 p.
500 $a Source: Dissertation Abstracts International, Volume: 76-09(E), Section: B.
500 $a Adviser: James C.Y Guo.
502 $a Thesis (Ph.D.)--University of Colorado at Denver, 2015.
520 $a Urban development results in increases of runoff rates and volumes. Since the early years in 1970's, storm water detention has been recommended as an effective means to reduce the peak of flow generated from the extreme events. Through the years from 1990 to 2000, the renaissance of urban storm water management leads to a new era under the new concept of low-impact-development (LID). The LID approach is mainly developed to cope with the small, frequent storm events. With both flood mitigation and LID approaches, an urban watershed's hydrologic regime can be preserved.
520 $a Among many creative ideas for developing engineering LID devices, rain garden is the most popular storm water infiltrating facility designed for on-site runoff volume reduction and water quality enhancement. A rain garden consists of a surface storage basin and subsurface infiltrating media. The storage basin is designed to store the water quality capture volume (WQCV) while the subsurface infiltrating system is composed of two layers of filtering media. The upper layer is filled with sand-mix and the lower layer is formed with gravels. The drain time is the most important design parameter for rain garden's operation. A short drain time will lead to an inadequate residence time for sedimentation process and not delay the peak runoff flow while a long drain time will raise the risk to have the next storm event before the basin dries up. A new rain garden usually has a high infiltration capacity through the filtering layers therefore rain garden's drain time is short. Over years of service, the clogging effect in the filtering layers will slow down its infiltration rate or prolong its drain time. To improve the performance of a rain garden through its life cycle, it is recommended that a cap-orifice be installed at the outlet of the perforated underdrain pipe.
520 $a The challenges in rain garden design include how to (1) select the design event to size the surface basin, how to (2) predict to the surface-subsurface flow through the filtering layers, and how to (3) adjust the cap-orifice to achieve the targeted flow release and drain time according to the stage of rain garden's life cycle.
520 $a In this study, several probability models were evaluated to portray the distributions of event runoff depths generated from 30 to 40-year long-term one-hr continuous rainfall events recorded in 9 metropolitan areas in the US continent. It was confirmed that the log-normal distribution gives the overall best fitted curve that can be further used to select the water quality capture volume (WQCV) to size the rain garden's storage basin. WQCV is found to be related to the local statistics of event rainfall depths, watershed imperviousness, and targeted runoff treatment percentage. The optimal WQCV generated from the log-normal distribution for runoff event depths is able to treat 80 to 90% of runoff volume generated from the tributary watershed. This conclusion is close to the US Environmental Protection Agency's recommendation on 80% runoff capture and treatment for stormwater quality enhancement management.
520 $a To predict the sub-surface flow movement, a diffusion-based sub-surface hydrologic model is developed to predict the water infiltrating process through the unsaturated and saturated sand-mix zones underneath a rain garden. The key factors for this numerical model are the soil initial moisture content and hydraulic conductivity which can be calibrated with field data. During the early years in a rain garden's service, the cap-orifice is used to regulate its flow release. For a given history in terms of field data, the numerical procedure developed in this study provides a quantifiable guidance on how to turn the cap orifice up and down to satisfy the design condition.
520 $a In coordination with the Urban Drainage and Flood Control District (UDFCD), Denver, Colorado, a prototype rain garden was built in the City of Lakewood, Colorado as a test site. The proposed methods and models derived in this study were tested and calibrated by 4-year field data collected at the test site. This numerical procedure significantly improves the current subjective and empirical operations at UDFCD. It is expected that this software engineering and algorithm derived in this study for rain garden's operation will be further incorporated in to a remote automation process that can be operated in office to control a rain garden's operation from a distance.
590 $a School code: 0765.
650 4 $a Civil engineering. $3 860360
650 4 $a Water resources management. $3 794747
690 $a 0543
690 $a 0595
710 2 $a University of Colorado at Denver. $b Civil Engineering. $3 2097571
773 0 $t Dissertation Abstracts International $g 76-09B(E).
790 $a 0765
791 $a Ph.D.
792 $a 2015
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3702079