EE WAS IN THE PROCESS OF PULLING A LOAD OF WATER UP THE ROAD WHEN SOMETHING BROKE ON THE TRUCK CAUSING THE TRUCK TO GO BACKWARDS APPROX 40-50 FEET. THE TRUCK CAB TURNED OVER ON ITS LEFT SIDE. EMPLOYEE RECEIVED 5 STITCHES TO THE LEFT SIDE OF HIS HEAD. HE WAS TAKEN TO HAZARD HRH WHERE HE WAS TREATED AND RELEASED.