Investigating the Relationship between the Manning Coefficients (n) of a Perforated Subsurface Stormwater Drainage Pipe and the Hydraulic Parameters

Subsurface perforated pipes drain infiltrated stormwater runoff while attenuating the peak flow. The Manning roughness coefficient (n) was identified as a fundamental parameter for estimating roughness in various subsurface channels. Hence, in this work, the performance of a six-row non-staggered sa...

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Main Authors: Abdullah J., Mohd Arif Zainol M.R.R., Riahi A., Zakaria N.A., Yusof M.F., Shaharuddin S., Alias M.N., Mohd Kasim M.Z., Abdul Aziz M.S., Mohamed Noor N., Zawawi M.H., Ikhsan J.
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Published: MDPI 2024
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spelling my.uniten.dspace-343352024-10-14T11:19:08Z Investigating the Relationship between the Manning Coefficients (n) of a Perforated Subsurface Stormwater Drainage Pipe and the Hydraulic Parameters Abdullah J. Mohd Arif Zainol M.R.R. Riahi A. Zakaria N.A. Yusof M.F. Shaharuddin S. Alias M.N. Mohd Kasim M.Z. Abdul Aziz M.S. Mohamed Noor N. Zawawi M.H. Ikhsan J. 55109846800 57193313971 55812065900 25643674100 37050433500 55927985200 57190672417 57792384000 36695908700 25221616600 39162217600 55926014300 Manning coefficient sand-slot perforated pipe stormwater runoff urban subsurface drainages Malaysia drainage basin flow velocity hydraulic property peak flow runoff subsurface flow Subsurface perforated pipes drain infiltrated stormwater runoff while attenuating the peak flow. The Manning roughness coefficient (n) was identified as a fundamental parameter for estimating roughness in various subsurface channels. Hence, in this work, the performance of a six-row non-staggered sand-slot perforated pipe as a sample of the subsurface drainage is investigated experimentally in a laboratory flume at Universiti Sains Malaysia (USM) aimed at determining the Manning roughness coefficients (n) of the pipe and assessing the relationship between the Manning�s n and the hydraulic parameters of the simulated runoff flow under the conditions of the tailgate channel being opened fully (GFO) and partially (GPO), as well as the pipe having longitudinal slopes of 1:750 and 1:1000. Water is pumped into the flume at a maximum discharge rate of 35 L/s, and the velocity and depth of the flow are measured at nine points along the inner parts of the pipe. Based on the calculated Reynolds numbers ranging from 38,252 to 64,801 for both GFO and GPO conditions, it is determined that most of the flow in the perforated pipe is turbulent, and the calculated flow discharges and velocities from the outlets under GFO are higher than the flow and velocity rates under GPO with similar pipe slopes of 1:750 and 1:1000. The Manning coefficients are calculated at nine points along the pipe and range from 0.004 to 0.009. Based on the ranges of the calculated Manning�s n, an inverse linear relationships between the Manning coefficients and the flow velocity under GFO and GPO conditions are observed with the R2 of 0.975 and 0.966, as well as 0.819 and 0.992 resulting from predicting the values of flow velocities with the equations v = ((0.01440 ? n)/0.009175), v = ((0.01330 ? n)/0.00890), v = ((0.02007 ? n)/0.01814), and v = ((0.01702 ? n)/0.01456) with pipe slopes of 1:750 and 1:1000, respectively. It is concluded that since the roughness coefficient (Manning�s n) of the pipe increases, it is able to reduce the flow velocity in the pipe, resulting in a lower peak of flow and the ability to control the quantity of storm water in the subsurface urban drainages. � 2023 by the authors. Final 2024-10-14T03:19:08Z 2024-10-14T03:19:08Z 2023 Article 10.3390/su15086929 2-s2.0-85156116802 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85156116802&doi=10.3390%2fsu15086929&partnerID=40&md5=a407d44cd0cf3497c5d48afc79910758 https://irepository.uniten.edu.my/handle/123456789/34335 15 8 6929 All Open Access Gold Open Access MDPI Scopus
institution Universiti Tenaga Nasional
building UNITEN Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Tenaga Nasional
content_source UNITEN Institutional Repository
url_provider http://dspace.uniten.edu.my/
topic Manning coefficient
sand-slot perforated pipe
stormwater runoff
urban subsurface drainages
Malaysia
drainage basin
flow velocity
hydraulic property
peak flow
runoff
subsurface flow
spellingShingle Manning coefficient
sand-slot perforated pipe
stormwater runoff
urban subsurface drainages
Malaysia
drainage basin
flow velocity
hydraulic property
peak flow
runoff
subsurface flow
Abdullah J.
Mohd Arif Zainol M.R.R.
Riahi A.
Zakaria N.A.
Yusof M.F.
Shaharuddin S.
Alias M.N.
Mohd Kasim M.Z.
Abdul Aziz M.S.
Mohamed Noor N.
Zawawi M.H.
Ikhsan J.
Investigating the Relationship between the Manning Coefficients (n) of a Perforated Subsurface Stormwater Drainage Pipe and the Hydraulic Parameters
description Subsurface perforated pipes drain infiltrated stormwater runoff while attenuating the peak flow. The Manning roughness coefficient (n) was identified as a fundamental parameter for estimating roughness in various subsurface channels. Hence, in this work, the performance of a six-row non-staggered sand-slot perforated pipe as a sample of the subsurface drainage is investigated experimentally in a laboratory flume at Universiti Sains Malaysia (USM) aimed at determining the Manning roughness coefficients (n) of the pipe and assessing the relationship between the Manning�s n and the hydraulic parameters of the simulated runoff flow under the conditions of the tailgate channel being opened fully (GFO) and partially (GPO), as well as the pipe having longitudinal slopes of 1:750 and 1:1000. Water is pumped into the flume at a maximum discharge rate of 35 L/s, and the velocity and depth of the flow are measured at nine points along the inner parts of the pipe. Based on the calculated Reynolds numbers ranging from 38,252 to 64,801 for both GFO and GPO conditions, it is determined that most of the flow in the perforated pipe is turbulent, and the calculated flow discharges and velocities from the outlets under GFO are higher than the flow and velocity rates under GPO with similar pipe slopes of 1:750 and 1:1000. The Manning coefficients are calculated at nine points along the pipe and range from 0.004 to 0.009. Based on the ranges of the calculated Manning�s n, an inverse linear relationships between the Manning coefficients and the flow velocity under GFO and GPO conditions are observed with the R2 of 0.975 and 0.966, as well as 0.819 and 0.992 resulting from predicting the values of flow velocities with the equations v = ((0.01440 ? n)/0.009175), v = ((0.01330 ? n)/0.00890), v = ((0.02007 ? n)/0.01814), and v = ((0.01702 ? n)/0.01456) with pipe slopes of 1:750 and 1:1000, respectively. It is concluded that since the roughness coefficient (Manning�s n) of the pipe increases, it is able to reduce the flow velocity in the pipe, resulting in a lower peak of flow and the ability to control the quantity of storm water in the subsurface urban drainages. � 2023 by the authors.
author2 55109846800
author_facet 55109846800
Abdullah J.
Mohd Arif Zainol M.R.R.
Riahi A.
Zakaria N.A.
Yusof M.F.
Shaharuddin S.
Alias M.N.
Mohd Kasim M.Z.
Abdul Aziz M.S.
Mohamed Noor N.
Zawawi M.H.
Ikhsan J.
format Article
author Abdullah J.
Mohd Arif Zainol M.R.R.
Riahi A.
Zakaria N.A.
Yusof M.F.
Shaharuddin S.
Alias M.N.
Mohd Kasim M.Z.
Abdul Aziz M.S.
Mohamed Noor N.
Zawawi M.H.
Ikhsan J.
author_sort Abdullah J.
title Investigating the Relationship between the Manning Coefficients (n) of a Perforated Subsurface Stormwater Drainage Pipe and the Hydraulic Parameters
title_short Investigating the Relationship between the Manning Coefficients (n) of a Perforated Subsurface Stormwater Drainage Pipe and the Hydraulic Parameters
title_full Investigating the Relationship between the Manning Coefficients (n) of a Perforated Subsurface Stormwater Drainage Pipe and the Hydraulic Parameters
title_fullStr Investigating the Relationship between the Manning Coefficients (n) of a Perforated Subsurface Stormwater Drainage Pipe and the Hydraulic Parameters
title_full_unstemmed Investigating the Relationship between the Manning Coefficients (n) of a Perforated Subsurface Stormwater Drainage Pipe and the Hydraulic Parameters
title_sort investigating the relationship between the manning coefficients (n) of a perforated subsurface stormwater drainage pipe and the hydraulic parameters
publisher MDPI
publishDate 2024
_version_ 1814061116919119872
score 13.222552