PERTH AIRPORT Master Plan 2009

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P E R T H A I R P O R T M a s t e r P l a n 2 0 0 9 The Department of Water’s current policy is to minimise increases in drainage inflows to the Swan River. To progress with the airport development plans contained in the Master Plan 2009 it will be necessary to increase the downstream outlet capacity or reduce the flow into the estate. Westralia Airports Corporation will continue to work with the Water Corporation, the Department of Water, the Swan River Trust and surrounding Local Governments to achieve the required outcome through increased upstream compensation and/or downstream outfall capacity to reduce the amount of compensation required on the airport estate. Internal System Capacity Southern Main Drain The Southern Main Drain has a number of limitations which contribute to the potential for localised flooding in peak flow events, in summary as follows: • The two 900 millimetre inlet pipes have insufficient capacity for the approach flow at the airport boundary and as a result localised flood can occur upstream. • The grade of the drain at 1:1500 is very flat, resulting in capacity limitations through the airport estate. • The 1200 millimetre pipes under Horrie Miller Drive and under the runway also have insufficient capacity for the required flows, resulting in flooding onto airport land east and west of Horrie Miller Drive. This land within Commercial Precinct 2 has, for many years, acted as a compensation basin for the drain. Development in this precinct and subsequently planned for elsewhere in this catchment will eliminate the informal compensating areas. • The open unlined drain that is downstream from the airport estate is generally in poor condition and contains several bends that restrict outflow capacity, further restricting flow in the Southern Main Drain within the airport estate. • The Southern Main Drain is designated as a main drain by the Water Corporation on each side of the airport. As the airport estate is on Federal land this section cannot be designated as a main drain by the State Government. The Water Corporation however undertakes the required maintenance on the Southern Main Drain within the airport, with access arranged by WAC. 10.3 Modifications Required For Development Southern Main Drain The alignment of the Southern Main Drain conflicts with the airport development plans in the following ways: • The current drain alignment passes through land required for the parallel Runway 03R/21L. • The current drain alignment passes through land allocated for the development of Precincts 4 and 6. Northern Main Drain The alignment of the Northern Main Drain and the drains that feed into it will conflict with the airport development plans in the following ways: • The current alignment of the Poison Gully Branch Drain passes through the land required for the parallel Runway 03R/21L. • The current alignment of the Northern Main Drain passes through the land required for the apron extension needed for the consolidated airport. • The current alignment of the Northern Main Drain passes through land required for the extension to Runway 06/24. Precinct 1 The current drainage system in Precinct 1 requires upgrading of sections of the piped network to allow for proposed development in this area of the airport following consolidation of airport operations to the International Precinct. 90
P E R T H A I R P O R T M a s t e r P l a n 2 0 0 9 10.4 Drainage System Development Plan Modifications to the existing Northern and Southern Main Drains will be required to enable the airport development plans contained in the Master Plan 2009 to proceed. Fundamental to the detailed design of these modifications will be resolution of the inflow versus outflow imbalance and the volume of onsite compensation required to achieve the desired outcomes. Previous work by the Water Corporation identified that, in addition to the runoff generated on site, the airport is required to accommodate a substantial amount of compensation capacity on site. In order to resolve these complex issues a comprehensive drainage study is being undertaken by Perth Airport to deliver the following outcomes: • a staged approach to drainage system development that will support the airport development plans; • data on the inflow and outflow capacities of the existing system and those required for ultimate airport development; and • delivery of a cost effective solution that meets sustainability targets and which takes into account potential climate change impacts. This study, which is scheduled for completion in 2009, will enable the production of a Drainage Infrastructure Plan across the airport estate. As a result of the high groundwater level at Perth Airport it has been identified that the surface water and groundwater are closely linked on the site. Therefore a detailed hydrological study is being undertaken in combination with the drainage study. Southern Main Drain The Southern Main Drain will need modification of both the route and configuration to allow for the airport development plans. In the short to medium term the drain will need to be modified to ensure that nuisance flooding does not occur. In the longer term modifications will need to be made to allow for the development of aviation infrastructure, including the proposed future parallel runway. The drainage strategy will be developed based on the outcomes of the current drainage study. Any proposed changes to the Southern Main Drain will include a full assessment of potential environmental implications. Incorporated into the upgrade of the Southern Main Drain will be the ‘Living Stream’ project which includes some of the overall retention required in this section of the drainage system. Northern Main Drain Some modifications are required to the alignment of the Northern Main Drain to allow for the airport development plans. Flows from catchments upstream of Perth Airport are currently compensated to some extent in Poison Gully and Munday Swamp. No change to the upstream inflows to the swamps has been considered. The Poison Gully Branch Drain currently passes through land reserved for the proposed future parallel runway. This branch drain will need to be relocated to allow for the parallel runway and associated taxiways. Any proposed changes to the Northern Main Drain will include a full assessment of the potential environmental implications. Minor Drainage Systems Development within Precinct 3 will be undertaken in line with recommendations in the Precinct 3 Drainage Strategy. As part of the wider drainage study detailed investigations will be required in Precinct 1 to identify opportunities to improve sections of this system as the use of the precinct changes over time. As the aviation demand in this precinct diminishes in line with the stage consolidation, changing demands in the large carpark areas will enable upgrades to sections of the drainage system that are under capacity. 91
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Westralia Airports Corporation ABN
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PERTH AIRPORT Master Plan 2009

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