3.2 Discharge

The annual discharge of the Palasjan River between 2004 and 2019, has been determined and presented in Figure \ref{147045} by utilizing the daily data from the Eskandari meteorological station, which serves as the watershed outlet (refer to Figure \ref{652980}). The results of assessing the presence of a trend in the discharge time series, are plotted in Table \ref{974045}. The MK test indicated an upward trend in discharge with a slope of 0.078. However, the z-statistic (z=0.49) and p-value (p=37.94) suggested that the trend was not statistically significant. Even after addressing autocorrelation in the prewhitened series the upward trend was still insignificant. The discharge data analysis suggested that the amount of water flowing out of the Eskandari watershed experienced no marked fluctuations over 16 years.