Application of Geoinformatics for Water Quality Monitoring in Kwan Phayao, Phayao Province

Abstract

The main objective of the project on the application of Geoinformatics in water quality monitoring a case study of Kwan Phayao province is to apply Geoinformatics technology to monitor water quality and create a water quality index of Kwan Phayao to determine water quality zones. The method of operation consists of 7 steps: 1) geometry correction 2) satellite image classification to extract only the water source 3) creating water quality data layer from survey to geographic coordinates 4) adjusting data according to water quality standards 5) scoring according to the water quality standard for comparison from the water quality index 6) multiplying the score obtained by the weighted value at the specified level and 7) creating a water quality map by defining the water quality standard level by dividing the total standard score. The geospatial data was used to determine the water quality in Kwan Phayao by considering together with the data of 3 variables; 1) Biological Oxygen Demand (BOD); 2) Nitrate nitrogen (NO3-N) and 3) Total phosphate (TP) and use the water quality standard criteria to adjust the standard score range from the water quality index. Finally, the score is multiplied by the weight of the specified level to determine the water quality. The results showed that the values remained at a very good standard for both NO3-N and TP values while the BOD values were mostly good. The area near the city has a fair value. Overview of the three parameters was found to be in very good mainly but near the city was found in good level due to the influence of BOD.