Determination Of Water Quality Depth For Stormwater Facilities In Peninsular Malaysia

Urbanization increases the amount of pollution carried out to downstream waterways. Best Management Practises (BMPs) have been identified as an approach to solve the problems. The effectiveness of BMPs depends on the volume of storm runoff that can be captured and treated by them, which is referred...

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Main Author:	Alang Othman, Mazlina
Format:	Thesis
Language:	English
Published:	2018
Subjects:	T Technology
Online Access:	http://eprints.usm.my/56149/1/Determination%20Of%20Water%20Quality%20Depth%20For%20Stormwater%20Facilities%20In%20Peninsular%20Malaysia_Mazlina%20Alang%20Othman.pdf
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spelling	my-usm-ep.561492022-12-28T08:36:29Z Determination Of Water Quality Depth For Stormwater Facilities In Peninsular Malaysia 2018-07-01 Alang Othman, Mazlina T Technology TC Hydraulic engineering. Ocean engineering Urbanization increases the amount of pollution carried out to downstream waterways. Best Management Practises (BMPs) have been identified as an approach to solve the problems. The effectiveness of BMPs depends on the volume of storm runoff that can be captured and treated by them, which is referred as water quality volume (WQV) and requires a fixed depth of runoff which is referred to as "Water Quality Depth" (WQD). The recommended WQD value for Malaysia stands at 40 mm and generated from limited data. This research aims to determine WQD by using local rainfall data and develop WQD distribution map for Peninsular Malaysia. It shows that 90th percentile is an optimum rainfall depth value for Northern and Central regions of Peninsular Malaysia while 95th percentile for Southern and East Coast regions. At 90th percentile, WQD was found to be in the range of 33 - 57 mm. However, WQD at 95th percentile was much higher which is in the range of 44 - 90 mm. Therefore, WQD of 40 mm was insufficient for Peninsular Malaysia and it is suggested that the WQD be reviewed. Findings of this study can be used for such a purpose. This study also shows that, due to the small number of significant increasing trends in extreme value identified, it was unnecessary to include extreme value in WQD estimation to avoid over design in BMPs facilities. For WQD distribution map, Inverse Distance Weighting (IDW) was chosen as the most reliable method for WQD interpolation at 90th percentile while Ordinary Kriging at 95th percentile. A field study at a constructed wetland was carried out to ascertain the relationship between WQD and BMPs facilities treatment performance. TSS recorded higher performance when rainfall depth was below than WQD value. However, BOD, COD, TN, TP and AN recorded higher performance when rainfall depth exceeded WQD value. 2018-07 Thesis http://eprints.usm.my/56149/ http://eprints.usm.my/56149/1/Determination%20Of%20Water%20Quality%20Depth%20For%20Stormwater%20Facilities%20In%20Peninsular%20Malaysia_Mazlina%20Alang%20Othman.pdf application/pdf en public phd doctoral Universiti Sains Malaysia Pusat Penyelidikan Kejuruteraan Sungai dan Saliran Bandar (REDAC)
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	T Technology T Technology
spellingShingle	T Technology T Technology Alang Othman, Mazlina Determination Of Water Quality Depth For Stormwater Facilities In Peninsular Malaysia
description	Urbanization increases the amount of pollution carried out to downstream waterways. Best Management Practises (BMPs) have been identified as an approach to solve the problems. The effectiveness of BMPs depends on the volume of storm runoff that can be captured and treated by them, which is referred as water quality volume (WQV) and requires a fixed depth of runoff which is referred to as "Water Quality Depth" (WQD). The recommended WQD value for Malaysia stands at 40 mm and generated from limited data. This research aims to determine WQD by using local rainfall data and develop WQD distribution map for Peninsular Malaysia. It shows that 90th percentile is an optimum rainfall depth value for Northern and Central regions of Peninsular Malaysia while 95th percentile for Southern and East Coast regions. At 90th percentile, WQD was found to be in the range of 33 - 57 mm. However, WQD at 95th percentile was much higher which is in the range of 44 - 90 mm. Therefore, WQD of 40 mm was insufficient for Peninsular Malaysia and it is suggested that the WQD be reviewed. Findings of this study can be used for such a purpose. This study also shows that, due to the small number of significant increasing trends in extreme value identified, it was unnecessary to include extreme value in WQD estimation to avoid over design in BMPs facilities. For WQD distribution map, Inverse Distance Weighting (IDW) was chosen as the most reliable method for WQD interpolation at 90th percentile while Ordinary Kriging at 95th percentile. A field study at a constructed wetland was carried out to ascertain the relationship between WQD and BMPs facilities treatment performance. TSS recorded higher performance when rainfall depth was below than WQD value. However, BOD, COD, TN, TP and AN recorded higher performance when rainfall depth exceeded WQD value.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Alang Othman, Mazlina
author_facet	Alang Othman, Mazlina
author_sort	Alang Othman, Mazlina
title	Determination Of Water Quality Depth For Stormwater Facilities In Peninsular Malaysia
title_short	Determination Of Water Quality Depth For Stormwater Facilities In Peninsular Malaysia
title_full	Determination Of Water Quality Depth For Stormwater Facilities In Peninsular Malaysia
title_fullStr	Determination Of Water Quality Depth For Stormwater Facilities In Peninsular Malaysia
title_full_unstemmed	Determination Of Water Quality Depth For Stormwater Facilities In Peninsular Malaysia
title_sort	determination of water quality depth for stormwater facilities in peninsular malaysia
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Penyelidikan Kejuruteraan Sungai dan Saliran Bandar (REDAC)
publishDate	2018
url	http://eprints.usm.my/56149/1/Determination%20Of%20Water%20Quality%20Depth%20For%20Stormwater%20Facilities%20In%20Peninsular%20Malaysia_Mazlina%20Alang%20Othman.pdf
_version_	1776101139153944576

Determination Of Water Quality Depth For Stormwater Facilities In Peninsular Malaysia

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