After delivering a part load of water at a Rig, a water tanker was travelling to deliver the remainder of water at the Rig camp. Whilst negotiating a left bend on the graded road, the driver lost control of the vehicles and swerved off the road where the vehicle rolled over. The Driver and helper escaped through passenger side door window. Employees from the Rig 49 camp witnessed the incident and came to their aid in a pick up vehicle. The driver and helper received first aid treatment before being sent to Yibal Clinic then Nizwa hospital before being discharged with minor injuries.