**2.1 Data statistical analysis**

The rainfall data consistency was tested using multiple mass curves [5, 6], while the discharge data normality test was conducted using probability density function (pdf) analysis with the criterion being that normally distributed data will form a linear or straight line. Moreover, the discharge probability was analyzed using the cumulative distribution function (CDF).

The statistical analysis is usually conducted to determine:


The criteria are divided into two, which are as follows:

