Study of Suitable Distance for Rain Gauge Installation

Abstract

­­This paper aims to examine the quality of rain gauge data and study the correlation coefficient in order to analyze the suitable distance of rain gauge installation. The study area are in Tron and Phichai District of Uttaradit Province and Muang District of Khon Kaen Province. In this study, Double Mass Curve method was used to examine the reliability of rain gauge data. The annual accumulated rainfall were used to analyze the correlation coefficient of rain gauge data that located in the study area. The results of the reliability of rain gauge data from 10 rain gauge stations in Tron and Pichai District of Uttaradit Province were examined by Double Mass Curve method, 9 stations were passed and 1 station must be adjusted while the result from all 11 rain gauge stations in Muang District of Khon Kaen Province were passed. The analysis of the correlation coefficient of the annual accumulated rainfall in each rain gauge station in order to be used to analyze the suitable distance of rain gauge installation showed the results that the suitable distance for installing the rain gauge station is in the range of 5 to 10 kilometers for Tron and Phichai districts of Uttaradit Province and Muang District of Khon Kaen Province.