The aircraft was on a private flight to Katoomba. As the airstrip was not licenced, the pilot rang the operator for permission to land there. He was not advised of any hazards at the airstrip. On arrival in the circuit area, the pilot determined that the wind conditions favoured landing in the 06 direction, and observed power lines crossing the approach path. The pilot reported that he decided to land the aircraft further along the runway than normal, to ensure adequate clearance from the power lines during the approach. After landing, he applied the brakes and steered the aircraft to the left side of the strip, prior to making a right turn to backtrack. However, the nose wheel struck a deep rut near the side of the strip, collapsing the nose landing gear, and allowing the propeller to strike the ground.