While, one of them had significant improving water quality trend (No. 11 Drain, P < 0.05, R2= 55.2%,rate of improvement water quality = 1.315 point/year on WQI scale; Table 3). Whereas, four drains had no significanttemporal trends (Nashart Drain, Tira Drain, No. 7 Drain and Lower No. 8 Drain P > 0.05; Table 3). Therefore, thisprocedure ensures that increasing or decreasing WQI of those four drains is fluctuated through most of the year andnot due to year variation. In general, the water quality of those five drains is mostly rated as marginal to fair for aquaticuses (Fig. 6).