First flush characteristics of storm runoff from an urban residential area in Malaysia

A. Idris, . and A.A. Mamun, . and W.N.W.A. Sulaiman, . (2008) First flush characteristics of storm runoff from an urban residential area in Malaysia. [Proceedings Paper]

Although first flush is a most likely phenomenon its existence at every drainage outlet is uncertain Various definitions can be found in the literature which are debatable. This paper reports the findings on the first flush phenomenon in urban runoff from a residential area in Malaysia. Three storm events of various intensities and durations were studied Twelve parameters were monitored for the first flush study First flush effect for most of the parameters was uncertain for every storm event. Although it was minor total organic carbon TOC and total suspended solids TSS exhibited first flush during all storm events Irregular and weak first flush phenomena were observed for most of the parameters. As such first flush separation would not be an effective criterion for diffuse or nonpoint pollution control in the study area. Based on the rainfall analysis it was recommended that to avoid the ambiguity pertaining to first flush phenomenon and to simplify the criterion for designing the nonpoint source pollution control structures capture and treatment of first 25 mm runoff would be a good start for Malaysia.

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Abstract

Although first flush is a most likely phenomenon its existence at every drainage outlet is uncertain Various definitions can be found in the literature which are debatable. This paper reports the findings on the first flush phenomenon in urban runoff from a residential area in Malaysia. Three storm events of various intensities and durations were studied Twelve parameters were monitored for the first flush study First flush effect for most of the parameters was uncertain for every storm event. Although it was minor total organic carbon TOC and total suspended solids TSS exhibited first flush during all storm events Irregular and weak first flush phenomena were observed for most of the parameters. As such first flush separation would not be an effective criterion for diffuse or nonpoint pollution control in the study area. Based on the rainfall analysis it was recommended that to avoid the ambiguity pertaining to first flush phenomenon and to simplify the criterion for designing the nonpoint source pollution control structures capture and treatment of first 25 mm runoff would be a good start for Malaysia.

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Item Type:	Proceedings Paper
Additional Information:	Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. GE90 M3I61 2008 Call Number
AGROVOC Term:	Pollution
AGROVOC Term:	Rainfall
AGROVOC Term:	Tropical climate
AGROVOC Term:	Drainage
AGROVOC Term:	Urban areas
Geographical Term:	MALAYSIA
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 05:14
URI:	http://webagris.upm.edu.my/id/eprint/11743

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