What happened
Following landing, the pilot reported that braking action was very poor due to a heavily irrigated section of the runway. The irrigation affected the area from midfield to the departure end of runway 16. As the aircraft attempted to decelerate, the tires appeared to hydroplane on the wet grass runway surface. Consequently, the pilot was unable to stop the aircraft before it overran the end of the runway and struck a fence.
The investigation
An FAA inspector examined the aircraft and identified specific structural damage. The inspection revealed that the bottom wing skin was torn and one aileron contained a puncture hole.
Findings
The pilot noted that the accident could have been prevented through more diligent monitoring of the runway watering system and by performing physical checks of the entire runway surface prior to takeoff to identify any variances in condition.