BWB was delighted to be involved in the creation of a 9,000 space car park at Manchester Airport, the third busiest airport in the UK. The new long-stay facility was needed to replace the spaces lost when an existing car park was integrated into the nearby Airport City development.
BWB were commissioned by Galliford Try to complete the detailed design for the car park including earthworks and drainage. The 29 hectare site is directly under the flight path at the end of Runway 1 so all parking spaces had to be uniformly positioned perpendicular to the flightpath to reduce the risk of glare for the pilots.
Two new vehicular accesses were also provided - one off an existing highway and the other off a re-aligned highway which was not yet open to the public. Both were carried out under S278 highway agreements. BWB also delivered electrical design services for the lighting, barriers and CCTV.
The car park was handed over in three phases, with the completion in December 2014 being both on time and budget.
BWB provided a cut/fill balance on 30,000m3 of material which was re-graded to form a gradual slope from one corner of the site to the other. An open graded porous gravel running surface allowed rainwater to pass through the gravel to the filter drains which removing the need for any channel drains or gullies.
We also value engineered the tender design by replacing two pumping stations with a single gravity outfall to a nearby watercourse. Large underground attenuation tanks were replaced with a series of filter drains and the landscape formed to create local small valleys that allow water to store above ground in large storm events. This saved the client in excess of £500,000 and eliminated the operational costs of pumping stations.