TNAG-2407-FCO40-3500-Airport-issues-in-Hong-Kong-Provisional-Airport-Authority.-W-1992 — Page 47

02-MAR-1992 17:33

G.I.S.

+ 852 537 1540

P.11

there will be no land access from the main

urban area, thus all construction materials

and the workmen must come by sea. The simplest way of providing berthing for the barges. which will deliver the materials, is to construct some of the seawall with a

vertical face.

Storm Drainage

A comprehensive gravity storm drainage system has beeh developed to carry rain water safely to the sea. The system will consist of a combination of pipes and cul- verts leading to even outfalls, and will have the capacity to discharge the rainfall from a one in 200 year storm from areas which are critical to the operation of the airport, and a one in 50 year storm from areas which are less critical. Some local areas of the development which are below sea level will require pumps to lift the drainage water into the gravity system.

For those areas of the airport which may be susceptible to oil contamination of the stormwater, particularly the aprons where aircraft are refuelled and the fuel farms.

special measures have been designed to remove the risk of oil or fuel being dis-

charged into the sea.

Runways, Taxiways and Aprons

Runways and Taxiways

All horizontal and vertical geometry will be in accordance with internationally ac- cepted criteria, and will permit the safe and rapid movement of aircraft of all sizes. Drainage will be achieved by crossfalls. Runway and taxiway lighting, marking and navigational aids will also be built to inter- national standards.

The runways and taxiways will generally be of flexible asphaltic concrete construction

which is able to accommodate small dif-

ferential settlements without distress. This

type of pavement construction is easier to maintain and resurface than cement con-

crete pavement.

At locations where aircraft turn through light radii, especially at the ends of the run- ways, greater resistance to scuffing will be provided by sections of cement concrete

construction. Shoulders, also of flexible con.

struction, will be formed adjacent to each side of the runways and taxiways to resist erosion caused by jet-blast.

Approach Lights

The approach light systems will extend 900m beyond the runway thresholds and into the sea. For the lights located over water, a supporting structure will consist of pile caps, each supported by three piles and connected by walkways. The lights will be supported by frangible mountings, which will fracture in the unlikely event of being struck by an aircraft's under- carriage.

Existing Mud

Typical Seawall Section

kness Varies

Underlayer

Selected Fill

Rock Armour

General Fil

40

23