*3.2. Trend of Each Component of Water Balance*

Analyzing the trend part of the time series for each term of the water balance, only the outflow (Q), lake level (H), and the groundwater source (GS) seem to have a clear trend from around 2010, whereas rainfall (PL), water inflow (E), and the lake volume variation (ΔV) seem to fluctuate around the average with no trend (Figure 4). Therefore, subtracting the seasonal component from the original time series (Figure 4), the time series adjusted for seasonality supported that only outflow (Q), lake level (H), and groundwater (GS) had a significant trend (Table 2).

**Table 1.** Results of break point analysis on monthly main water balance terms adjusted for seasonality.


**Table 2.** Results of Mann–Kendall test applied on the main water balance terms.


**Figure 4.** Main water balance terms adjusted for seasonality: (**a**) direct rainfall on lake PL, (**b**) water inflow E, (**c**) lake level variation ΔV, (**d**) outflow from the lake Q, (**e**) groundwater source GS, and (**f**) lake level H. In addition, (**d**–**f**) report the break point indicated in Table 1.
