3.1.7. Concentration median based on constructed datasetFor the 20 drains discharging to Northern Lakes and Mediterranean Sea, one drain has insufficient data to be analyzedfor trends (Burullus Drain), four drains had significant increases in water quality (Bahr ElBaqar Drain, Drain No. 1,Tabia Drain and No. 11 Drain), one drain (Ramsis Drain) had significant declination in water quality over the timeperiod (2002–2013). While the rest (14 drains) showed no significant trend in either direction (improving or declining)Therefore, water quality fluctuated over the time period (2002–2013).