## 4 Results and Discussion
### Water Balance Evaluation between 2020 and 2029
#### 4.7.4 Monthly Water Balance with the Consideration of Ecological Water Requirements  
Table 27 reports the monthly water balance with the consideration of ecological water requirements in terms of surplus and deficit under normal and new normal conditions between 2020 and 2029. As indicated by the results in Table 27, under the dry year scenario in the normal condition, the monthly water balance shows a deficit from November to May. It varies from \(-\)55.37 million m\({}^{3}\) in March to \(-\)7.39 million m\({}^{3}\) in November. However, the monthly water balance indicates a surplus from June to October and varies from 16.03 million m\({}^{3}\) in June to 56.14 million m\({}^{3}\) in October. Under the dry year scenario in the new normal condition, the monthly water balance reveals a deficit from November to May. It varies from \(-\)54.93 million m\({}^{3}\) in March to \(-\)7.08 million m\({}^{3}\) in November. However, the monthly water balance in the same period indicates a surplus from June to October, varying from 16.37 million m\({}^{3}\) in June to 56.47 million m\({}^{3}\) in October. On the contrary, the monthly water balance shows a deficit from January to April under the wet year scenario in the normal condition. It varies from \(-\)52.27 million m\({}^{3}\) in March to \(-\)8.50 million m\({}^{3}\) in January. However, the monthly water balance reveals a surplus from May to December, varying from 8.85 million m\({}^{3}\) in December to 240.35 million m\({}^{3}\) in October. In addition, the monthly water balance indicates a deficit from January to April under the wet year scenario in the new normal condition. It varies from \(-\)51.82 million m\({}^{3}\) in March to \(-\)8.04 million m\({}^{3}\) in January. However, the monthly water balance shows a surplus from May to December, varying from 9.28 million m\({}^{3}\) in December to 240.67 million m\({}^{3}\) in October. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{3}{*}{**Month**} & \multicolumn{3}{c}{**Water Supply (Million m\({}^{3}\))**} & \multicolumn{3}{c}{**Water Demand (Million m\({}^{3}\))**} & \multicolumn{3}{c}{**Water Balance (Surplus or Deficit) (Million m\({}^{3}\))**} \\ \cline{2-10}  & **Dry Year** & **Wet Year** & **Normal** & **New Normal** & **Normal** & **New Normal** & **Normal** & **New Normal** \\ \hline January & \(-\)1.69 & 33.01 & 41.51 & 41.05 & \(-\)43.19 & \(-\)42.74 & \(-\)8.50 & \(-\)8.04 \\ February & \(-\)8.38 & 7.16 & 40.78 & 40.36 & \(-\)49.16 & \(-\)48.74 & \(-\)33.62 & \(-\)33.19 \\ March & \(-\)10.46 & \(-\)7.35 & 44.91 & 44.47 & \(-\)55.37 & \(-\)54.93 & \(-\)52.27 & \(-\)51.82 \\ April & 7.94 & \(-\)9.50 & 41.35 & 40.99 & \(-\)33.41 & \(-\)33.06 & \(-\)50.85 & \(-\)50.50 \\ May & 3.80 & 70.02 & 38.04 & 37.78 & \(-\)34.24 & \(-\)33.98 & 31.98 & 32.24 \\ June & 53.27 & 93.89 & 37.23 & 36.89 & 16.03 & 16.37 & 56.65 & 56.99 \\ July & 70.39 & 85.52 & 37.61 & 37.37 & 32.79 & 33.02 & 47.91 & 48.15 \\ August & 59.92 & 136.24 & 37.86 & 37.62 & 22.06 & 22.30 & 98.38 & 98.62 \\ September & 53.86 & 227.32 & 33.39 & 33.15 & 20.47 & 20.71 & 193.94 & 194.18 \\ October & 89.96 & 274.17 & 33.82 & 33.49 & 56.14 & 56.47 & 240.35 & 240.67 \\ November & 26.45 & 128.32 & 33.85 & 33.53 & \(-\)7.39 & \(-\)7.08 & 94.47 & 94.78 \\ December & 19.56 & 46.62 & 37.77 & 37.33 & \(-\)18.21 & \(-\)17.77 & 8.85 & 9.28 \\ \hline Total & 364.62 & 1085.40 & 458.11 & 454.03 & \(-\)93.48 & \(-\)89.41 & 627.29 & 631.37 \\ \hline \hline \end{tabular}
\end{table} 
Table 27: Monthly water supply and demand balance evaluation with the consideration of ecological water requirements between 2020 and 2029. Figure 16 displays the monthly water balance with the consideration of ecological water requirements in terms of surplus (positive) and deficit (negative) under the dry and wet year scenarios in the normal and new conditions.