Date of Publication

12-2023

Document Type

Dissertation

Degree Name

Doctor of Philosophy in Civil Engineering

Subject Categories

Civil and Environmental Engineering | Civil Engineering | Engineering

College

Gokongwei College of Engineering

Department/Unit

Civil Engineering

Thesis Advisor

Renan T. Tanhueco

Defense Panel Chair

Mario P. De Leon

Defense Panel Member

Aileen Orbecido

Arnel Beltran

Miguel A. Salazar

Abstract/Summary

This study investigated the probability of infection and health risk associated from the contaminated water measured in Pandurucan River, San Jose, Occidental Mindoro from September 2019 to December 2022 by analyzing the water quality parameters, rainfall-runoff characteristics, exposure pathways and dose-response relation. The Water Quality Index considered the analysis of water samples for temperature, pH, dissolved oxygen, total dissolved solids, total suspended solids, phosphate, nitrate, oil, and grease, chloride and E. coli. The results of the water quality index showed poor water quality in the mid sections of the river while the results of the Principal Component Analysis showed that dissolved oxygen, total dissolved solids, total suspended solids and oil and grease were highly significant during wet seasons and dissolved oxygen, chloride, total dissolved solids and temperature have strongest relationship with water quality index during the dry seasons. The Soil Water Assessment Tool evaluated the impacts of existing land use, climate pattern, and soil type on the water quality of the river resulted to 25 sub basins with 57 distinct Hydraulic Response Units based on threshold of 10% for land use, 10% for soil and 5% for slope. Results of the Soil and Water Assessment Tool showed that Soil Conservation Curve number or the ability of the soil to allow infiltration and moisture soil condition is the most sensitive parameter affecting the stream flow while the bacteria partition coefficient and temperature are the most important parameters affecting the growth of the E. coli in the catchment. Lastly, the health risk from the accidental ingestion of river water for children and adult showed higher exposure during dry seasons and varies increasingly as exposure volume increases. The risk assessment considering the exposure to flood depths, population density and inundated areas showed equal probability risk of infection for children and adults. The study estimates 17 people with infection risks from E. coli present in floodwater.

Keywords: Water quality index, Soil and Water Assessment Tool, Hydraulic Response Unit, E. coli, exposure dose, quantitative microbial risk assessment, risk of infection

Abstract Format

html

Language

English

Format

Electronic

Keywords

Water quality; Microbial ecology

Upload Full Text

wf_yes

Embargo Period

12-11-2023

Download

Share

COinS