A six-year-old boy, Raju drowned in an under-construction drainage canal, when he was playing near his house, at Kandriga of Vijayawada. They went missing last evening and his dead body was seen floating in the drainage canal this morning, his relatives said. The police have arrived at the spot and have sent the dead body for post mortem. However, there is no sign of officials at the spot. There should have been a barricade to prevent children from playing near the canal, the victim's relatives said.