American Society of Civil Engineers


Water Quality Assessment during River Channel Alteration for Flood Mitigation in Metro Manila, Philippines


by R. Gilbuena, (Department of Civil and Environmental Engineering, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo, 192-0397, Japan E-mail: gilbuena-romeojr@ed.tmu.ac.jp), A. Kawamura, (Department of Civil and Environmental Engineering, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo, 192-0397, Japan), R. Medina, (Woodfields Consultants, Incorporated, 153 Kamias, Road Extension, Quezon City, Philippines, 1102 E-mail: reynaldo.medina@wci.com.ph), N. Nakagawa, (Department of Civil and Environmental Engineering, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo, 192-0397, Japan), and H. Amaguchi, (Department of Civil and Environmental Engineering, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo, 192-0397, Japan)
Section: 9th Urban Watershed Management Symposium, pp. 580-591, (doi:  http://dx.doi.org/10.1061/9780784412312.062)

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Document type: Conference Proceeding Paper
Part of: World Environmental and Water Resources Congress 2012: Crossing Boundaries
Abstract: This study investigates the water quality of the Pasig River in Metro Manila during the construction of river improvements through channel alteration. Statistical and trend analysis of surface water have been performed using the records (2008-2011) of 5 water quality parameters (pH, dissolved oxygen, biochemical oxygen demand, total suspended solids and EC) at 4 observation sites along the Pasig River. The trend analyses were performed using a moving average approach and non-parametric Spearman’s rho technique. The results indicate that most of the water quality parameters do not show significant trend; except for BOD and EC where these were found to significantly increasing in some of the observation sites. TSS was significantly decreasing in one site. Apart from these analyses, 14 other water quality parameters, collected annually, were assessed by comparing the values with the Philippine water quality standards. The findings of this study provide useful references for the monitoring of river water quality in Metro Manila.


ASCE Subject Headings:
Water quality
Channels
Floods
Philippine Islands