Performance of grassed swale as stormwater quantity control in lowland area

Grassed swale is a vegetated open channel designed to attenuate stormwater through infiltration and conveying runoff into nearby water bodies, thus reduces peak flows and minimizes the causes of flood. UTHM is a flood-prone area due to located in lowland area, has high groundwater level and low infi...

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Main Author:	Mustaffa, Nurhazirah
Format:	Thesis
Language:	English English English
Published:	2018
Subjects:	QE701-760 Paleontology
Online Access:	http://eprints.uthm.edu.my/356/1/24p%20NURHAZIRAH%20MUSTAFFA.pdf http://eprints.uthm.edu.my/356/2/NURHAZIRAH%20MUSTAFFA%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/356/3/NURHAZIRAH%20MUSTAFFA%20WATERMARK.pdf
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spelling	my-uthm-ep.3562021-07-25T00:58:57Z Performance of grassed swale as stormwater quantity control in lowland area 2018-04 Mustaffa, Nurhazirah QE701-760 Paleontology Grassed swale is a vegetated open channel designed to attenuate stormwater through infiltration and conveying runoff into nearby water bodies, thus reduces peak flows and minimizes the causes of flood. UTHM is a flood-prone area due to located in lowland area, has high groundwater level and low infiltration rates. The aim of this study is to assess the performance of grassed swale as a stormwater quantity control in UTHM. Flow depths and velocities of swales were measured according to Six-Tenths Depth Method shortly after a rainfall event. Flow discharges of swales (Qswale) were evaluated by Mean- Section Method to determine the variations of Manning’s roughness coefficients (ncalculate) that results between 0.075 – 0.122 due to tall grass and irregularity of channels. Based on the values of Qswale between sections of swales, the percentages of flow attenuation are up to 54%. As for the flow conveyance of swales, Qswale were determined by Manning’s equation that divided into Qcalculate, evaluated using ncalculate, and Qdesign, evaluated using roughness coefficient recommended by MSMA (ndesign), to compare with flow discharges of drainage areas (Qpeak), evaluated by Rational Method with 10-year ARI. Each site of study has shown Qdesign is greater than Qpeak up to 59%. However, Qcalculate is greater than Qpeak only at a certain site of study up to 14%. The values of Qdesign also greater than Qcalculate up to 52% where it shows that the roughness coefficients as considered in MSMA are providing a better performance of swale. This study also found that the characteristics of the studied swales are comparable to the design consideration by MSMA. Based on these findings, grassed swale has the potential in collecting, attenuating, and conveying stormwater, which suitable to be applied as one of the best management practices in preventing flash flood at UTHM campus. 2018-04 Thesis http://eprints.uthm.edu.my/356/ http://eprints.uthm.edu.my/356/1/24p%20NURHAZIRAH%20MUSTAFFA.pdf text en public http://eprints.uthm.edu.my/356/2/NURHAZIRAH%20MUSTAFFA%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/356/3/NURHAZIRAH%20MUSTAFFA%20WATERMARK.pdf text en validuser mphil masters Universiti Tun Hussein Onn Malaysia Faculty of Civil Engineering and Built Environment
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	QE701-760 Paleontology
spellingShingle	QE701-760 Paleontology Mustaffa, Nurhazirah Performance of grassed swale as stormwater quantity control in lowland area
description	Grassed swale is a vegetated open channel designed to attenuate stormwater through infiltration and conveying runoff into nearby water bodies, thus reduces peak flows and minimizes the causes of flood. UTHM is a flood-prone area due to located in lowland area, has high groundwater level and low infiltration rates. The aim of this study is to assess the performance of grassed swale as a stormwater quantity control in UTHM. Flow depths and velocities of swales were measured according to Six-Tenths Depth Method shortly after a rainfall event. Flow discharges of swales (Qswale) were evaluated by Mean- Section Method to determine the variations of Manning’s roughness coefficients (ncalculate) that results between 0.075 – 0.122 due to tall grass and irregularity of channels. Based on the values of Qswale between sections of swales, the percentages of flow attenuation are up to 54%. As for the flow conveyance of swales, Qswale were determined by Manning’s equation that divided into Qcalculate, evaluated using ncalculate, and Qdesign, evaluated using roughness coefficient recommended by MSMA (ndesign), to compare with flow discharges of drainage areas (Qpeak), evaluated by Rational Method with 10-year ARI. Each site of study has shown Qdesign is greater than Qpeak up to 59%. However, Qcalculate is greater than Qpeak only at a certain site of study up to 14%. The values of Qdesign also greater than Qcalculate up to 52% where it shows that the roughness coefficients as considered in MSMA are providing a better performance of swale. This study also found that the characteristics of the studied swales are comparable to the design consideration by MSMA. Based on these findings, grassed swale has the potential in collecting, attenuating, and conveying stormwater, which suitable to be applied as one of the best management practices in preventing flash flood at UTHM campus.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Mustaffa, Nurhazirah
author_facet	Mustaffa, Nurhazirah
author_sort	Mustaffa, Nurhazirah
title	Performance of grassed swale as stormwater quantity control in lowland area
title_short	Performance of grassed swale as stormwater quantity control in lowland area
title_full	Performance of grassed swale as stormwater quantity control in lowland area
title_fullStr	Performance of grassed swale as stormwater quantity control in lowland area
title_full_unstemmed	Performance of grassed swale as stormwater quantity control in lowland area
title_sort	performance of grassed swale as stormwater quantity control in lowland area
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Faculty of Civil Engineering and Built Environment
publishDate	2018
url	http://eprints.uthm.edu.my/356/1/24p%20NURHAZIRAH%20MUSTAFFA.pdf http://eprints.uthm.edu.my/356/2/NURHAZIRAH%20MUSTAFFA%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/356/3/NURHAZIRAH%20MUSTAFFA%20WATERMARK.pdf
_version_	1747830590545068032

Performance of grassed swale as stormwater quantity control in lowland area

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