At 1130 Mountain time, the airplane collided with an airport perimeter fence during landing and nosed over. The Private pilot and three passengers were not injured; the airplane sustained substantial damage. Visual conditions prevailed. According to the pilot, while on final approach, the airplane began descending rapidly. The pilot retracted the flaps 10 degrees and applied full power, but the airplane continued to descend until it struck the airport perimeter fence and nosed over. According to the airport manager, approximately 35 gallons of fuel were drained from the airplane following the accident.