The feeder channel taking off from the Lower Sarda Barrage is long, feeds the five branches of Dariyabad, Barabani, Haideganj, RaeBareil and Purva, and is designed to carry a discharge of . The Sarda Sahayak feeder channel meets the Haidergarh branch at and Raibareli branch at . The entire canal system is considered the largest in Asia and designed to provide irrigation to a Culturalable Command Area (CCA) of covering 14 districts in 168 blocks with a gross command area of .