In previous years the runway has, at times, had to close during the winter months. Consultants were employed to review and recommend improvement works that would resolve this. They have concluded that the areas become waterlogged because water is unable to penetrate the top 18 inches of the surface.
Taking into account these findings, they have recommended that the surface be regraded and a drainage system is built into the runways and aircraft movement areas.
The re-grading process involves:
• Remove and discard top 20mm grass and soil
• Remove and retain 200mm of topsoil
• Using laser guided specialist equipment cut drainage channels, fill and then resurface
This creates a flat surface, which will also have a gradient of up to 2% across the runways to assist the drainage.