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Variations in rainwater quality from roof catchments

The quality of rainwater from a tile and a galvanized-iron type roof catchments were analysed over a period of 5 months. Examination of staggered I litre samples collected during a rainfall event showed that the concentration of various pollutants were high in the first litre but decreased in subseq...

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Main Authors: Yaziz, Mohammad Ismail, Gunting, H, Sapari, Nasiman, Ghazali, A. W.
Format: Article
Language:English
English
Published: Maxwell Pergamon Macmillan 1989
Online Access:http://psasir.upm.edu.my/id/eprint/40076/1/Variations%20in%20rainwater%20quality%20from%20roof%20catchments.pdf
http://psasir.upm.edu.my/id/eprint/40076/7/1-s2.0-004313548990211X-main.pdf
http://psasir.upm.edu.my/id/eprint/40076/
http://www.sciencedirect.com/science/article/pii/004313548990211X
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spelling my.upm.eprints.400762024-07-19T08:10:21Z http://psasir.upm.edu.my/id/eprint/40076/ Variations in rainwater quality from roof catchments Yaziz, Mohammad Ismail Gunting, H Sapari, Nasiman Ghazali, A. W. The quality of rainwater from a tile and a galvanized-iron type roof catchments were analysed over a period of 5 months. Examination of staggered I litre samples collected during a rainfall event showed that the concentration of various pollutants were high in the first litre but decreased in subsequent samples with few exceptions. Faecal coliform and total coliform counts ranged from 8–13 (tile roof) and 4–8 (iron roof) to 41–75 (tile roof) and 25–63 (iron roof) colonies per 100 ml, respectively. However, no faecal coliforms were detected in the fourth and fifth litre samples from both roofs. The pH of rainwater collected from the open was acidic but increased slightly after falling on the roofs. The average zinc concentrations in the run-off from the galvanized-iron roof was about 5-fold higher compared to the tile roof, indicating leaching action but was well below the WHO limits for drinking water quality. Lead concentrations remained consistently high in all samples collected and exceeded the WHO guidelines by a factor of 3.5. For the roof area studied, a “foul flush” volume of 51. would be the minimum to safeguard against microbiological contamination but the high metals content in the water indicate the need for some form of treatment. Rainfall intensity and the number of dry days preceeding a rainfall event significantly affects the quality of run-off water from the catchment systems. Maxwell Pergamon Macmillan 1989-06 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/40076/1/Variations%20in%20rainwater%20quality%20from%20roof%20catchments.pdf text en http://psasir.upm.edu.my/id/eprint/40076/7/1-s2.0-004313548990211X-main.pdf Yaziz, Mohammad Ismail and Gunting, H and Sapari, Nasiman and Ghazali, A. W. (1989) Variations in rainwater quality from roof catchments. Water Research, 23 (6). pp. 761-765. ISSN 0043-1354; ESSN: 1879-2448 http://www.sciencedirect.com/science/article/pii/004313548990211X 10.1016/0043-1354(89)90211-X
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
English
description The quality of rainwater from a tile and a galvanized-iron type roof catchments were analysed over a period of 5 months. Examination of staggered I litre samples collected during a rainfall event showed that the concentration of various pollutants were high in the first litre but decreased in subsequent samples with few exceptions. Faecal coliform and total coliform counts ranged from 8–13 (tile roof) and 4–8 (iron roof) to 41–75 (tile roof) and 25–63 (iron roof) colonies per 100 ml, respectively. However, no faecal coliforms were detected in the fourth and fifth litre samples from both roofs. The pH of rainwater collected from the open was acidic but increased slightly after falling on the roofs. The average zinc concentrations in the run-off from the galvanized-iron roof was about 5-fold higher compared to the tile roof, indicating leaching action but was well below the WHO limits for drinking water quality. Lead concentrations remained consistently high in all samples collected and exceeded the WHO guidelines by a factor of 3.5. For the roof area studied, a “foul flush” volume of 51. would be the minimum to safeguard against microbiological contamination but the high metals content in the water indicate the need for some form of treatment. Rainfall intensity and the number of dry days preceeding a rainfall event significantly affects the quality of run-off water from the catchment systems.
format Article
author Yaziz, Mohammad Ismail
Gunting, H
Sapari, Nasiman
Ghazali, A. W.
spellingShingle Yaziz, Mohammad Ismail
Gunting, H
Sapari, Nasiman
Ghazali, A. W.
Variations in rainwater quality from roof catchments
author_facet Yaziz, Mohammad Ismail
Gunting, H
Sapari, Nasiman
Ghazali, A. W.
author_sort Yaziz, Mohammad Ismail
title Variations in rainwater quality from roof catchments
title_short Variations in rainwater quality from roof catchments
title_full Variations in rainwater quality from roof catchments
title_fullStr Variations in rainwater quality from roof catchments
title_full_unstemmed Variations in rainwater quality from roof catchments
title_sort variations in rainwater quality from roof catchments
publisher Maxwell Pergamon Macmillan
publishDate 1989
url http://psasir.upm.edu.my/id/eprint/40076/1/Variations%20in%20rainwater%20quality%20from%20roof%20catchments.pdf
http://psasir.upm.edu.my/id/eprint/40076/7/1-s2.0-004313548990211X-main.pdf
http://psasir.upm.edu.my/id/eprint/40076/
http://www.sciencedirect.com/science/article/pii/004313548990211X
_version_ 1805889930287644672
score 13.211869

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