\(\begin{equation} \label{eq:8} \bar{P}=\frac{1}{A} \sum_{i=1}^n p_i a_i \end{equation}\)
 Where \(\overline{p}\) represents the average precipitation across the basin, i=1,2,., n, and A is the overall area of the watershed. The area of the ith Thiessen polygon and its corresponding precipitation are represented by ai and pi, respectively \cite{a2012}. Table \ref{599106} provides information on the area, location, and average precipitation for each Thiessen polygon from 2004 to 2019. The average precipitation of the studied area using the Thiessen method was equal to 391 mm over the 16 years.