## 4 Results and Discussion
### Estimation of Water Yield between 2020 and 2029
#### 4.4.2 Water Yield Estimation under Wet Year Scenario  
Table 18 displays the annual water yield of simulated LULC between 2020 and 2029 under the wet year scenario with 3686.00 mm rainfall. According to the results, the estimated annual water yield varies from 2347.42 mm (1225.48 million m\({}^{3}\)) to 2379.23 mm (1242.08 million m\({}^{3}\)), with an average annual water yield of 2361.84 mm (1233.00 million m\({}^{3}\)). In addition, the estimated annual evapotranspiration varies from 934.30 mm to 936.10 mm, with an average annual evapotranspiration value of 935.27 mm. The annual evapotranspiration of Phuket Island under this scenario is relatively stable. Additionally, as with the dry year scenario, these findings indicate that LULC change affects water yield through its hydrologic component and evapotranspiration because, as significant input data for water yield estimation, rainfall data are fixed. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Year**} & \multicolumn{5}{c}{**Hydrological Component (mm)**} \\ \cline{2-7}  & **Surface Runoff** & **Lateral Flow** & \begin{tabular}{c} **Groundwater** \\ **(Shallow Aquifier)** \\ \end{tabular} & \
\begin{tabular}{c} **Groundwater** \\ **(Deep Aquifier)** \\ \end{tabular} &
\begin{tabular}{c} **Evapotranspiration** \\ \end{tabular} & **Water Yield** \\ \hline
2020 & 575.23 & 110.68 & 264.10 & 17.35 & 1298.60 & 967.36 \\
2021 & 578.95 & 109.98 & 262.55 & 17.25 & 1297.90 & 968.73 \\
2022 & 582.68 & 109.41 & 260.65 & 17.14 & 1297.50 & 969.89 \\
2023 & 587.34 & 110.49 & 257.20 & 16.92 & 1296.90 & 971.96 \\
2024 & 590.45 & 107.93 & 258.30 & 16.95 & 1295.70 & 973.63 \\
2025 & 601.77 & 106.19 & 252.51 & 16.58 & 1294.20 & 977.05 \\
2026 & 646.69 & 100.71 & 229.32 & 15.20 & 1286.70 & 991.92 \\
2027 & 652.05 & 99.15 & 228.90 & 15.11 & 1284.10 & 995.21 \\
2028 & 656.34 & 98.73 & 226.44 & 14.97 & 1283.60 & 996.48 \\
2029 & 664.12 & 96.80 & 223.77 & 14.79 & 1281.50 & 999.49 \\ \hline Average & 613.56 & 105.01 & 246.37 & 16.23 & 1291.67 & 981.17 \\ \hline \hline \end{tabular}
\end{table} 
Table 16: Annual water yield of Phuket Island between 2020 and 2029 under dry year scenario. \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Month**} & \multicolumn{5}{c}{**Water Yield between 2020 and 2029 (Million m\({}^{3}\))**} & \multirow{2}{*}{**Average**} \\ \cline{2-11}  & **2020** & **2021** & **2022** & **2023** & **2024** & **2025** & **2026** & **2027** & **2028** & **2029** \\ \hline January & 10.40 & 10.38 & 10.36 & 10.34 & 10.26 & 10.18 & 11.03 & 11.04 & 11.04 & 11.07 & 10.61 \\ February & 4.13 & 4.12 & 4.10 & 4.08 & 4.13 & 4.09 & 3.66 & 3.64 & 3.61 & 3.59 & 3.92 \\ March & 1.93 & 1.92 & 1.91 & 1.88 & 1.88 & 1.86 & 1.77 & 1.76 & 1.75 & 1.73 & 1.84 \\ April & 19.24 & 19.39 & 19.56 & 19.84 & 20.04 & 20.42 & 20.58 & 20.92 & 21.04 & 21.32 & 20.24 \\ May & 15.11 & 15.19 & 15.28 & 15.46 & 15.47 & 15.68 & 16.92 & 17.17 & 17.28 & 17.46 & 16.10 \\ June & 61.31 & 61.66 & 61.98 & 62.49 & 62.28 & 63.22 & 69.93 & 70.40 & 70.89 & 71.49 & 65.57 \\ July & 80.55 & 80.79 & 81.01 & 81.40 & 81.71 & 82.43 & 84.31 & 84.61 & 84.83 & 85.29 & 82.69 \\ August & 70.92 & 71.01 & 71.10 & 71.27 & 71.57 & 71.87 & 73.22 & 73.58 & 73.67 & 74.03 & 72.22 \\ September & 66.82 & 66.79 & 66.73 & 66.67 & 66.92 & 66.81 & 65.22 & 65.30 & 65.20 & 65.14 & 66.16 \\ October & 102.30 & 102.40 & 102.50 & 102.60 & 103.00 & 103.40 & 101.60 & 101.60 & 101.60 & 101.80 & 102.26 \\ November & 39.46 & 39.33 & 39.16 & 38.86 & 38.57 & 38.09 & 38.59 & 38.65 & 38.53 & 38.29 & 38.75 \\ December & 32.88 & 32.78 & 32.69 & 32.49 & 32.46 & 32.07 & 30.98 & 30.88 & 30.77 & 30.61 & 31.86 \\ \hline Average & 42.08 & 42.14 & 42.19 & 42.29 & 42.40 & 42.51 & 43.20 & 43.29 & 43.35 & 43.48 & 42.68 \\ \hline \hline \end{tabular}
\end{table} 
Table 17: Monthly water yield of Phuket Island between 2020 and 2029 under dry year scenario.