Wairau/Awatere Resource Management Plan 20 November 2009 rises so that it penetrates or becomes close to the horizontal surface, then,with the written permission of the Director of Civil Aviation, this surface may be adjusted in conformity with the ground so as to provide a vertical clearance of 10 metres above ground level. i) Conical Surface The conical surface extends from the periphery of the horizontal surface upwards and outwards at a slope of 5% until a height of 150 metres above the airfield datum is reached.Where ground rises so that it penetrates or becomes close to the conical surface then this surface may, with the written permission of the Director of Civil Aviation,be adjusted in conformity with the ground so as to provide vertical clearance of 10 metres. Note: All height restrictions are based on Civil Aviation (AC 139.06A) obstacle limitation surfaces. All elevations in this notice are provided in metres above average mean sea level unless otherwise stated. Designation for State Highways - Description of State Highway Purposes To control, manage and improve the state highway network including planning, design, research, construction and maintenance relating to all land within the designation.Such activities may involve realigning the road, altering its physical configuration, culverts, bridges and associated protection works. App B - 14