Water supply will be affected in parts of Delhi today due to the annual flushing programme of the underground reservoir and booster pumping stations, Delhi Jal Board (DJB) announced in an advisory. The affected areas include the Sultanpuri area, Sector-3 Pocket-F 23 Rohini, Sector-3 Pocket-A-1 Rohini, Filling Point and Karala Village, along with surrounding areas and Sector-3 Pocket-B 10 Rohini.