RedactedNarrative: V1 was drifting in the current of Townsend Canal approaching a concrete structure / spillway at the Caloosahatchee River. The operator tried to anchor V1 on the upstream side of structure. The anchor could not hold V1 and V1 came in contact with the structure along its starboard side. It was lodged against structure until the force of the flowing water rotated it clockwise. The bow of V1 went over the top of the structure and the foot of the trolling motor lodged against the structure. Due the small size of V1, the fast flowing water caused V1 to capsize, ejecting both occupants into the water. Operator managed to swim to a nearby buoy line and pulled himself the land. The occupant succumbed to the turbulent waters and drowned. His body was recovered approximately 6 hrs. later.