3.1.6. Drains discharging to Mediterranean Sea
The objective of the statistical analysis was to evaluate temporal trends in water quality over time. In MediterraneanSea, there are four drains discharging directly to it. Drain No. 1 and Tabia Drain show significant improving waterquality trend (P < 0.05 on both; Table 3). In addition, temporal changes in the year of measurement can explain 61.7%and 48.7%, respectively of the temporal variability observed in the WQI (Table 3). While, water quality of GharbiaDrain and Max pump station fluctuated during the study period (2002–2013) temporal trends ensure that increasing ordecreasing water quality of those drains had no significance trends. Therefore, a high P value (P = 0.791 and 0.255 forGharbia Drain and Max pump station, respectively; Table 3) suggests that the year of measurement has a small impacton water quality of those two drains. In addition, temporal changes in year of measurement can explain only 0.8% and14.1% of the temporal variability observed in the WQI (Table 3).