Risk based analysis for detention pond overflow at Iskandar Malaysia (Nusajaya), Johor

Overflow risk of detention pond is defined as the probability of having a rainfall event that produces a runoff volume more than the available storage capacity of detention pond. Overflow risk analysis depends on the waiting period (elapse time) and draining time. This study dealt with risk analysis...

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Main Author:	Suif, Zuliziana
Format:	Thesis
Language:	English
Published:	2008
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/9863/1/ZulizianaSuifMFKM2008.pdf
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id	my-utm-ep.9863
record_format	uketd_dc
spelling	my-utm-ep.98632018-07-25T08:06:30Z Risk based analysis for detention pond overflow at Iskandar Malaysia (Nusajaya), Johor 2008-06 Suif, Zuliziana TA Engineering (General). Civil engineering (General) Overflow risk of detention pond is defined as the probability of having a rainfall event that produces a runoff volume more than the available storage capacity of detention pond. Overflow risk analysis depends on the waiting period (elapse time) and draining time. This study dealt with risk analysis of detention pond overflow at Ledang Heights, Nusajaya, Johor Bahru. Monte Carlo simulation the simplest application to estimate the probability of occurrence of the 10 year rainfall interevent timeswas applied during this study. The maximum value for interevent time was 8 hr and 6 hr occurred with probability 24.18% and 28.39% after 5000 and 10000 trials respectively using Gamma distribution. The most likely range for interevent time were 2 to 18 hr (1.34%-1%) and 2 to 22 hr (3.84%-0.05%). The equation by Guo (2002) was applied during this study. The highest overflow risk obtained was 0.425 for the longest drain time of 71.75 minutes and for shortest elapse time. The overflow risk increases as the drain time increases and the elapse time decreases. Therefore, the selection of a proper drain time (recession time) is very important for reducing risk of overflow. Size of detention pond at the site is 70 m length x 70 m width x 3 m depth. The new size suggested was 82 m length x 70 m width x 3 m depth. The storage capacity of detention pond was larger than the volume of maximum rainfall data. The new size of detention pond is appropriate at the area because it could collect the maximum volume of runoff over a longer time period at the lowest overflow risk. It is suggested to design at lower elapse and drain time to minimize the overflow risk. 2008-06 Thesis http://eprints.utm.my/id/eprint/9863/ http://eprints.utm.my/id/eprint/9863/1/ZulizianaSuifMFKM2008.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Civil Engineering Faculty of Civil Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) Suif, Zuliziana Risk based analysis for detention pond overflow at Iskandar Malaysia (Nusajaya), Johor
description	Overflow risk of detention pond is defined as the probability of having a rainfall event that produces a runoff volume more than the available storage capacity of detention pond. Overflow risk analysis depends on the waiting period (elapse time) and draining time. This study dealt with risk analysis of detention pond overflow at Ledang Heights, Nusajaya, Johor Bahru. Monte Carlo simulation the simplest application to estimate the probability of occurrence of the 10 year rainfall interevent timeswas applied during this study. The maximum value for interevent time was 8 hr and 6 hr occurred with probability 24.18% and 28.39% after 5000 and 10000 trials respectively using Gamma distribution. The most likely range for interevent time were 2 to 18 hr (1.34%-1%) and 2 to 22 hr (3.84%-0.05%). The equation by Guo (2002) was applied during this study. The highest overflow risk obtained was 0.425 for the longest drain time of 71.75 minutes and for shortest elapse time. The overflow risk increases as the drain time increases and the elapse time decreases. Therefore, the selection of a proper drain time (recession time) is very important for reducing risk of overflow. Size of detention pond at the site is 70 m length x 70 m width x 3 m depth. The new size suggested was 82 m length x 70 m width x 3 m depth. The storage capacity of detention pond was larger than the volume of maximum rainfall data. The new size of detention pond is appropriate at the area because it could collect the maximum volume of runoff over a longer time period at the lowest overflow risk. It is suggested to design at lower elapse and drain time to minimize the overflow risk.
format	Thesis
qualification_level	Master's degree
author	Suif, Zuliziana
author_facet	Suif, Zuliziana
author_sort	Suif, Zuliziana
title	Risk based analysis for detention pond overflow at Iskandar Malaysia (Nusajaya), Johor
title_short	Risk based analysis for detention pond overflow at Iskandar Malaysia (Nusajaya), Johor
title_full	Risk based analysis for detention pond overflow at Iskandar Malaysia (Nusajaya), Johor
title_fullStr	Risk based analysis for detention pond overflow at Iskandar Malaysia (Nusajaya), Johor
title_full_unstemmed	Risk based analysis for detention pond overflow at Iskandar Malaysia (Nusajaya), Johor
title_sort	risk based analysis for detention pond overflow at iskandar malaysia (nusajaya), johor
granting_institution	Universiti Teknologi Malaysia, Faculty of Civil Engineering
granting_department	Faculty of Civil Engineering
publishDate	2008
url	http://eprints.utm.my/id/eprint/9863/1/ZulizianaSuifMFKM2008.pdf
_version_	1747814782791057408

Risk based analysis for detention pond overflow at Iskandar Malaysia (Nusajaya), Johor

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