720.10(1) Obstruction-free area
a. The following areas of the airport shall be free of any obstructions with the exception of operational and frangible equipment that is essential for the operation of the airport:
(1) Within 30 feet of runway edge markers along the entire length of a nonpaved runway.
(2) Within 125 feet of the centerline of a paved runway.
(3) Within 200 feet of the end of any paved runway.
(4) In no case shall a building be closer than 50 feet from a prepared runway surface. If buildings are on both sides of a runway, they shall be no closer than 125 feet from the runway centerline.
b. An object of natural growth, terrain, or permanent or temporary construction within the areas listed in paragraph “a” of this subrule shall be removed by the sponsor.
c. The following areas of the airport shall be free of all agricultural activities (i.e., crops or farm equipment) in excess of 8 inches in height:
(1) Within 50 feet of paved runway surfaces and 200 feet from paved runway ends.
(2) Within 60 feet of a nonpaved runway centerline.
(3) Within a 100-foot radius of automated weather observing system equipment.