| Abstract: To improve the service life of drip emitters used in tunnel water drainage, this study employed two different flushing methods (Emitter Flushing: E, Lateral Flushing: L) to investigate the trends of relative flow rates, emitter clogging conditions, and flow recovery capabilities under three flushing pressures (0.05, 0.1, 0.15 MPa) and three nominal flow rates (2, 4, 8 L?h-1). The results indicate that flushing measures significantly enhance the clogging resistance of tunnel water drainage emitters. The effective watering frequency (relative flow rate ≥ 75%) of flushed emitters increased by 57.27% compared to the unflushed control group. Overall, lateral flushing outperformed emitter flushing. The flow recovery capabilities of emitters improved significantly with increasing nominal flow rates. After flushing, the effective watering frequencies for emitters at 2, 4, and 8 L?h-1 increased by 24.39%, 33.85%, and 146.47%, respectively, with a recommended flushing pressure of 0.1 MPa. These findings provide a reference for implementing suitable clogging resistance measures in practical production. |