Filtration plays vital role to improve the efficacy and reduce the maintenance of
drip irrigation systems. The experiment was conducted to evaluate drip irrigation
filters (gravel, disk filter and their combination) for groundwater filtration. Water
quality parameters responsible for emitter plugging, such as total solids,
turbidity, Ca, Mg, CO3 and HCO3 were analyzed at the entry and exit points of
filters. The filtration efficiency for water quality parameters was estimated with
individual filters and in combination. Significant improvement was observed for
turbidity, total solids, carbonate and bicarbonate. The filtration efficiency with
combination filter was 14.3±8.8% for turbidity and 16.3±9.31% for bicarbonates.
Gravel filter gave better results for filtration of bicarbonate in comparison to the
disk filter. Emitters protected by the gravel media filter experienced the largest
flow rate reductions but emitters protected by combination filters experienced
least flow rate reduction. Backwashing of filters reduces the filtration efficiency
and head loss. To reduce emitter plugging by removal of accumulated sediment,
flushing of mains, submains and laterals are recommended. Higher improvement
in uniformity coefficient was observed in subsurface drip after flushing
operation. The results may be utilized in planning and design of subsurface drip
irrigation system to diminish emitter clogging incidence.