Carpark B at the Stoke Mandeville Hospital had been out of action for a number of months due to drainage and flooding issues. Hercules were employed at short notice to remove the existing carpark and construct a new 100 space parking area. The improvements were required to alleviate the hospital’s loss of parking revenue and to improve access and parking problems exacerbated by Covid-19 related issues.

The scheme involved innovative drainage design to eliminate future flooding and increase on site retention of storm water. This incorporated storage tanks and a diffuser system allowing excess water to be retained within the carpark subbase and capping layers. After removal of the existing carpark, two underground storage tanks were constructed using poly-storm PSM1 attenuation units surrounded in a welded geomembrane.

20mm shingle surrounded the sealed tanks to protect the membranes before overlaying with a permeable road construction. All Kerb and drainage work was carried out at weekends to ensure the tank construction programme was not delayed; this also reduced the overall project duration. This initiative resulted in the handover of the new car park 2 weeks ahead of the original opening date.

Due to the short lead time and urgency to re-open the car park; the design hadn’t been completed. Hercules worked collaboratively with the client’s team to design and build during the construction phase of the project.

All drainage, ducting, floodlighting, CCTV bases and 7 electric car charging points were installed by Hercules before arranging our asphalt contractor and white line teams to facilitate the safe handover of the car park back to the NHS trust.

The Carpark was opened ahead of schedule and used as a temporary Covid-19 vaccination centre on the 9th December 2021 due to the increase in Covid -19 cases at that time.

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