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Modelling for Climate Adaptation in Urban Drain Design with Orifice Flow Restrictor

Due to the increasing stormwater runoff in urban areas, stormwater infrastructure requires modification to address the flash flooding issues. Occurrences of floodwater overflowing the urban drain have urged drainage engineers to re-look its design. Conventionally, the urban drain is designed to free...

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Main Authors:	Mah, Yau Seng, Merry Tang, Shi Ting, Rosmina, Ahmad Bustami, Wong, Yoke Seng, Nurhayati, Nurhayati, Frederik Josep, Putuhena
Format:	Article
Language:	English
Published:	Semarak Ilmu Publishing 2024
Subjects:	TA Engineering (General). Civil engineering (General) TD Environmental technology. Sanitary engineering TH Building construction
Online Access:	http://ir.unimas.my/id/eprint/46585/1/ARFMTSV123_N2_P162_174.pdf http://ir.unimas.my/id/eprint/46585/ https://semarakilmu.com.my/journals/index.php/fluid_mechanics_thermal_sciences/article/view/12039 https://doi.org/10.37934/arfmts.123.2.162174
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id	my.unimas.ir-46585
record_format	eprints
spelling	my.unimas.ir-465852024-11-12T01:41:39Z http://ir.unimas.my/id/eprint/46585/ Modelling for Climate Adaptation in Urban Drain Design with Orifice Flow Restrictor Mah, Yau Seng Merry Tang, Shi Ting Rosmina, Ahmad Bustami Wong, Yoke Seng Nurhayati, Nurhayati Frederik Josep, Putuhena TA Engineering (General). Civil engineering (General) TD Environmental technology. Sanitary engineering TH Building construction Due to the increasing stormwater runoff in urban areas, stormwater infrastructure requires modification to address the flash flooding issues. Occurrences of floodwater overflowing the urban drain have urged drainage engineers to re-look its design. Conventionally, the urban drain is designed to free flow following the provided drain slope. This paper is challenging the old design by introducing orifices into the drain. The lesser-known stormwater characteristics restricted by orifices in open drains were investigated. In this case, twenty-four units of terrace houses were selected as the study area with special attention to the 170 m front drain with a dimension of 0.5 m x 0.55 m. The drain was inserted with one to three orifices of 0.45 m diameter separating the drain into one or more compartments. Three scenarios were formulated, namely S1 with one orifice plate at 170 m, S2 with two orifice plates at 86 and 170 m, and S3 with three orifices at 50, 110 and 170 m, from the starting point. Storm Water Management Model version 5.0 (SWMM5) was utilized to simulate and represent the unique characteristics of the three scenarios subjected to a 5-minute, 10-year average recurrent interval design storm. The analysis found that S1 had similar patterns with the existing condition and therefore, was insignificant. However, S2 and S3 demonstrated improved regulation of flow and water level along the drain. Between the two scenarios, S3 repeatedly displayed the most stable patterns, for example, S3 had a tight range of water levels between 0.30-0.34 m (compared to existing condition with fluctuating water levels between 0.32-0.50 m) and a tight range of flows between 0.01-0.08 m3/s (compared to existing condition with wider range of flows between 0.01-0.18 m3/s). The flows in S3 were reduced by half by introducing these series of orifices. These results point to an important finding that orifices were not worsening flood flushing in open drain but capable to regulate the flow and water level better than existing condition without any orifice. The capability of orifices to lower water levels allowing more spaces within the drain channel to accommodate climate-induced floodwater. Semarak Ilmu Publishing 2024-11-10 Article PeerReviewed text en http://ir.unimas.my/id/eprint/46585/1/ARFMTSV123_N2_P162_174.pdf Mah, Yau Seng and Merry Tang, Shi Ting and Rosmina, Ahmad Bustami and Wong, Yoke Seng and Nurhayati, Nurhayati and Frederik Josep, Putuhena (2024) Modelling for Climate Adaptation in Urban Drain Design with Orifice Flow Restrictor. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 123 (2). pp. 162-174. ISSN 2289 - 7879 https://semarakilmu.com.my/journals/index.php/fluid_mechanics_thermal_sciences/article/view/12039 https://doi.org/10.37934/arfmts.123.2.162174
institution	Universiti Malaysia Sarawak
building	Centre for Academic Information Services (CAIS)
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaysia Sarawak
content_source	UNIMAS Institutional Repository
url_provider	http://ir.unimas.my/
language	English
topic	TA Engineering (General). Civil engineering (General) TD Environmental technology. Sanitary engineering TH Building construction
spellingShingle	TA Engineering (General). Civil engineering (General) TD Environmental technology. Sanitary engineering TH Building construction Mah, Yau Seng Merry Tang, Shi Ting Rosmina, Ahmad Bustami Wong, Yoke Seng Nurhayati, Nurhayati Frederik Josep, Putuhena Modelling for Climate Adaptation in Urban Drain Design with Orifice Flow Restrictor
description	Due to the increasing stormwater runoff in urban areas, stormwater infrastructure requires modification to address the flash flooding issues. Occurrences of floodwater overflowing the urban drain have urged drainage engineers to re-look its design. Conventionally, the urban drain is designed to free flow following the provided drain slope. This paper is challenging the old design by introducing orifices into the drain. The lesser-known stormwater characteristics restricted by orifices in open drains were investigated. In this case, twenty-four units of terrace houses were selected as the study area with special attention to the 170 m front drain with a dimension of 0.5 m x 0.55 m. The drain was inserted with one to three orifices of 0.45 m diameter separating the drain into one or more compartments. Three scenarios were formulated, namely S1 with one orifice plate at 170 m, S2 with two orifice plates at 86 and 170 m, and S3 with three orifices at 50, 110 and 170 m, from the starting point. Storm Water Management Model version 5.0 (SWMM5) was utilized to simulate and represent the unique characteristics of the three scenarios subjected to a 5-minute, 10-year average recurrent interval design storm. The analysis found that S1 had similar patterns with the existing condition and therefore, was insignificant. However, S2 and S3 demonstrated improved regulation of flow and water level along the drain. Between the two scenarios, S3 repeatedly displayed the most stable patterns, for example, S3 had a tight range of water levels between 0.30-0.34 m (compared to existing condition with fluctuating water levels between 0.32-0.50 m) and a tight range of flows between 0.01-0.08 m3/s (compared to existing condition with wider range of flows between 0.01-0.18 m3/s). The flows in S3 were reduced by half by introducing these series of orifices. These results point to an important finding that orifices were not worsening flood flushing in open drain but capable to regulate the flow and water level better than existing condition without any orifice. The capability of orifices to lower water levels allowing more spaces within the drain channel to accommodate climate-induced floodwater.
format	Article
author	Mah, Yau Seng Merry Tang, Shi Ting Rosmina, Ahmad Bustami Wong, Yoke Seng Nurhayati, Nurhayati Frederik Josep, Putuhena
author_facet	Mah, Yau Seng Merry Tang, Shi Ting Rosmina, Ahmad Bustami Wong, Yoke Seng Nurhayati, Nurhayati Frederik Josep, Putuhena
author_sort	Mah, Yau Seng
title	Modelling for Climate Adaptation in Urban Drain Design with Orifice Flow Restrictor
title_short	Modelling for Climate Adaptation in Urban Drain Design with Orifice Flow Restrictor
title_full	Modelling for Climate Adaptation in Urban Drain Design with Orifice Flow Restrictor
title_fullStr	Modelling for Climate Adaptation in Urban Drain Design with Orifice Flow Restrictor
title_full_unstemmed	Modelling for Climate Adaptation in Urban Drain Design with Orifice Flow Restrictor
title_sort	modelling for climate adaptation in urban drain design with orifice flow restrictor
publisher	Semarak Ilmu Publishing
publishDate	2024
url	http://ir.unimas.my/id/eprint/46585/1/ARFMTSV123_N2_P162_174.pdf http://ir.unimas.my/id/eprint/46585/ https://semarakilmu.com.my/journals/index.php/fluid_mechanics_thermal_sciences/article/view/12039 https://doi.org/10.37934/arfmts.123.2.162174
_version_	1817848734358175744
score	13.244413

Modelling for Climate Adaptation in Urban Drain Design with Orifice Flow Restrictor

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