Ascot Racecourse Parade Ring
The Challenge was to install a complete drainage system 9 days before a major event!
The Clerk of the Course at Ascot gave the go ahead to begin the install on 6th October 2014 for a project scheduled to take one week. Five days later our EGRP system was fully installed, the Parade Ring cleaned and fencing reassembled. The whole project was delivered on schedule and in good time for the QIPCO British Champions Day on 18th October, one of the biggest racing events of the year and the culmination of the European Flat Racing season.
Groundwater was collecting along a section of Ascot’s world famous Parade Ring resulting in saturated soil conditions which in turn adversely effected the growth of the signature hedge, which is a major decorative feature of this most prestigious venue. The area requiring drainage was sandwiched between the semi-permeable surface of the parade ring and a concrete viewing stand which meant that access was limited and that great care had to be taken to ensure that no damage was caused to surfaces, fencing or the hedge itself.
Following a thorough site investigation and examination of localised bore hole records a 30 metre long, linear formation of EGRP devices at 2 metre centres were vertically installed to form an exit route for groundwater which was trapped near the surface.
A 2.8 tonne Comacchio specialist drill-rig, mounted on two layers of track mats was used to drill 60 bore holes up to 6 metres deep. EGRP devices were capped and then vertically inserted into the bore holes respectively, penetrating a thick layer of heavy clay near the surface before reaching layers of unsaturated course sand below. These lower layers of course sand relieved the saturated surface area as groundwater which was previously trapped above a heavy clay seam found its way down through each device before being discharged into this more freely draining soil.
In this instance, the ground was almost immediately relieved from saturation leaving the hedgerow to thrive in soil no longer burdened with standing groundwater. Despite several bouts of heavy and prolonged rainfall since the installation there has not been any evidence of surface ponding or waterlogging in the treated areas.