Modified and applied water quality index for Pak Phanang River, Nakhon Si Thammarat, Thailand

Name: Titamaporn Srichun

Organization : Walailak University. School of Civil and Environmental Engineering

Email : titamaporn.gif@gmail.com

Name: Chuthamat Rattikansukha

Organization : Walailak University. Center of Excellence in Sustainable Disaster Management

Email : chuthamat.ra@wu.ac.th

LCSH: Water quality -- Indexes

LCSH: Water -- Pollution -- Measurement

LCSH: Multivariate analysis

LCSH: Principal components analysis

LCSH: Enterobacteriaceae

Abstract: Pak Phanang River is important for agriculture, aquaculture, and water supply in Nakhon Si Thammarat Province. However, water quality in this river usually degrades during the rainy season. Stakeholders in this area are concerned about water quality, and they need a simple warning system to communicate with river users. In this study, a water quality index was developed using principal component analysis (PCA) with SPSS to identify major parameters influencing water quality in the river. Water quality data from Pak Phanang River from 2008–2018 were used to develop an appropriate water quality index for this river. The results showed that parameters were divided into three components explaining 78.65% of the water quality variation in the river. The first component included total coliform bacteria (TCB) and fecal coliform bacteria (FCB); the second component included dissolved oxygen (DO) and ammonia (NH₃); and the third component included biochemical oxygen demand (BOD₅). Consequently, three parameters from each component, including TCB, DO, and BOD₅, were selected to develop the water quality index (WQI) for the river. The developed WQI demonstrated 73.8% similarity with the WQI of the Pollution Control Department, which uses five parameters to rate overall water quality status in Thailand.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2021

Modified: 2026-01-29

Issued: 2026-01-29

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BibliograpyCitation : In Thai Institute of Chemical Engineering and Applied Chemistry. The 30th Thai Institute of Chemical Engineering and Applied Chemistry Conference (TIChE 2021) (ESD01). Nakhon Ratchasima : Suranaree University of Technology

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