The official has been identified as D Rao Sahib who is a native of Maharashtra and is posted at the Central Armed Force's camp in Bawana, said a police official.
Sahib went to the canal with his friends and allegedly fell after he slipped off. His friends failed to rescue him and called up the police control room.
Later, a rescue operation was launched by Delhi Fire Services and the district administration but Sahib could not be traced till late night, the offcial added.