(a) each strip associated with runways 04-22 and 14-32 consisting of an inclined plane having a ratio of one (1) foot measured vertically to fifty (50) feet measured horizontally, rising to an imaginary horizontal line drawn at right angles to the projected centre line of each strip one thousand (1,000) feet measured vertically above the elevation at the end of each strip and fifty thousand (50,000) feet measured horizontally from the end of each strip, the outer ends of each imaginary horizontal line being eight thousand (8,000) feet from each projected centre line, and
