Modeling of non point source pollution from residental and commercial catchments in Skudai, Johor

Sampling of urban runoff was carried out in two small catchments, which represent residential and commercial areas in Skudai, Johor. Ten storm events for residential and seven events for commercial catchments were analysed. Runoff quality showed large variations in concentrations during storms, espe...

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Main Author:	Rahmat, Siti Nazahiyah
Format:	Thesis
Language:	English
Published:	2005
Subjects:	TC Hydraulic engineering Ocean engineering
Online Access:	http://eprints.utm.my/id/eprint/5103/1/SitiNazahiyahRahmatMFKA2005.pdf
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id	my-utm-ep.5103
record_format	uketd_dc
spelling	my-utm-ep.51032018-02-28T06:54:27Z Modeling of non point source pollution from residental and commercial catchments in Skudai, Johor 2005-12 Rahmat, Siti Nazahiyah TC Hydraulic engineering. Ocean engineering Sampling of urban runoff was carried out in two small catchments, which represent residential and commercial areas in Skudai, Johor. Ten storm events for residential and seven events for commercial catchments were analysed. Runoff quality showed large variations in concentrations during storms, especially for SS, BOD5 and COD. Concentrations of NO3-N, NO2-N, NH3-N, and P were also high. Lead (Pb) was also detected in both catchments but the levels were low (<0.001 mg/l). In general, the water quality was badly polluted and fell in class V of the Interim National Water Quality Standards. The hydrographs and pollutographs for both catchments showed rapid increases and decreases equally rapidly. Most pollutants were diluted as storm events progress. In most cases, the peak concentrations preceded the peak runoff. This suggests that the pollutants were of short distant sources/origins and the bulk of the pollutant mass arrived at the catchmentâ€™s outlet much faster than the runoff itself. For the hysteresis loop, both catchments showed most of the parameters were characterized by clockwise hysteresis. Only a few plots were exhibited counterclockwise and figure eight hysteresis loop. The relative strength of the first flush for the commercial catchment was P> COD>SS> NO3-N> NO2-N> BOD5> NH3-N whereas for the residential catchment was SS> COD> BOD5> NH3-N> P> NO3-N> NO2-N. The loadings were higher in the commercial than in the residential catchment and this was attributed to a greater runoff volume per unit area and higher Event Mean Concentration (EMC) in the former. Detail calibration and validation of Storm Water Management Model (SWMM) for modeling water quantity and quality were discussed. The simulation results, evaluated in terms of runoff depth, peak flow and the hydrograph shapes, were satisfactorily. For the water quality modeling, the simulation results were evaluated in terms of total load and peak load. SWMM can model SS load reasonably well for the residential catchment, but was not satisfactory for the commercial catchment. 2005-12 Thesis http://eprints.utm.my/id/eprint/5103/ http://eprints.utm.my/id/eprint/5103/1/SitiNazahiyahRahmatMFKA2005.pdf application/pdf en public https://core.ac.uk/display/11781309 masters Universiti Teknologi Malaysia, Faculty of Civil Engineering Faculty of Civil Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TC Hydraulic engineering Ocean engineering
spellingShingle	TC Hydraulic engineering Ocean engineering Rahmat, Siti Nazahiyah Modeling of non point source pollution from residental and commercial catchments in Skudai, Johor
description	Sampling of urban runoff was carried out in two small catchments, which represent residential and commercial areas in Skudai, Johor. Ten storm events for residential and seven events for commercial catchments were analysed. Runoff quality showed large variations in concentrations during storms, especially for SS, BOD5 and COD. Concentrations of NO3-N, NO2-N, NH3-N, and P were also high. Lead (Pb) was also detected in both catchments but the levels were low (<0.001 mg/l). In general, the water quality was badly polluted and fell in class V of the Interim National Water Quality Standards. The hydrographs and pollutographs for both catchments showed rapid increases and decreases equally rapidly. Most pollutants were diluted as storm events progress. In most cases, the peak concentrations preceded the peak runoff. This suggests that the pollutants were of short distant sources/origins and the bulk of the pollutant mass arrived at the catchmentâ€™s outlet much faster than the runoff itself. For the hysteresis loop, both catchments showed most of the parameters were characterized by clockwise hysteresis. Only a few plots were exhibited counterclockwise and figure eight hysteresis loop. The relative strength of the first flush for the commercial catchment was P> COD>SS> NO3-N> NO2-N> BOD5> NH3-N whereas for the residential catchment was SS> COD> BOD5> NH3-N> P> NO3-N> NO2-N. The loadings were higher in the commercial than in the residential catchment and this was attributed to a greater runoff volume per unit area and higher Event Mean Concentration (EMC) in the former. Detail calibration and validation of Storm Water Management Model (SWMM) for modeling water quantity and quality were discussed. The simulation results, evaluated in terms of runoff depth, peak flow and the hydrograph shapes, were satisfactorily. For the water quality modeling, the simulation results were evaluated in terms of total load and peak load. SWMM can model SS load reasonably well for the residential catchment, but was not satisfactory for the commercial catchment.
format	Thesis
qualification_level	Master's degree
author	Rahmat, Siti Nazahiyah
author_facet	Rahmat, Siti Nazahiyah
author_sort	Rahmat, Siti Nazahiyah
title	Modeling of non point source pollution from residental and commercial catchments in Skudai, Johor
title_short	Modeling of non point source pollution from residental and commercial catchments in Skudai, Johor
title_full	Modeling of non point source pollution from residental and commercial catchments in Skudai, Johor
title_fullStr	Modeling of non point source pollution from residental and commercial catchments in Skudai, Johor
title_full_unstemmed	Modeling of non point source pollution from residental and commercial catchments in Skudai, Johor
title_sort	modeling of non point source pollution from residental and commercial catchments in skudai, johor
granting_institution	Universiti Teknologi Malaysia, Faculty of Civil Engineering
granting_department	Faculty of Civil Engineering
publishDate	2005
url	http://eprints.utm.my/id/eprint/5103/1/SitiNazahiyahRahmatMFKA2005.pdf
_version_	1747814564167155712

Modeling of non point source pollution from residental and commercial catchments in Skudai, Johor

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