Investigation on probability distribution of water volume in region of Eastern Thailand

Abstract

The purpose of this study is to study water supply volume data and investigate the probability distribution that fit to the data in region of Eastern Thailand. The water supply volume are collected from Provincial Waterworks Authority Region 1 from October 2009 to September 2015 for 5 branches; Laem Chabang, Pattaya, Rayong, Chachoengsao and Prachin Buri. The probability distributions of interest are Normal, Log-normal, Weibull and Log-logistic distribution. Anderson Darling test is applied to test whether the interested distribution is fitted to the data. The results show that at Laem Chabang, Rayong and Chachoengsao, the probability distribution of water supply volume is Normal distribution and at Pattaya and Prachin Buri the probability distribution of water supply volume is Log-normal distribution.