Project Commenced: March 2020
Project Completed: May 2020
Client: Network Rail
About the Project
Elmstead Woods Station was one of a several stations scheduled for minor refurbishment works to upgrade the passenger experience, and the works included a number of safety enhancements including the addition of tactile paving on the platforms, and platform resurfacing. These works were contracted to BCM under the CAPEX framework for Network Rail (South East).
At Elmstead station, additional issues were raised with regard to the existing dished drainage channel on Platform 1. This provided a tripping hazard to persons accessing the platform from the footbridge, and it was reported that during heavy rain, ponding of water was observed.
An additional dished channel to the rear of the platform at the London End of the platform was also scheduled for replacement.
The initial scope called for the dished platform drainage channels to be replaced with covered ACO channels which were to utilise the existing below ground drainage outlet points. Following a topographical survey and on-site investigations of the existing drainage, it was determined that a section of the channel by the footbridge fell away from the outlet, and the channel at the London End discharged down the platform ramp into the cess. This therefore required a more detailed hydraulic design than initially envisaged, but to the same tight deadline.
Multiple options were considered and designed, including for soakaways, which were discounted due to spatial constraints including existing buried HV cables. In the end, further intrusive investigations of the wider existing drainage network were undertaken, and suitable connection points identified that the new drainage could be connected to.
- Topographical Survey – prior to any design works, the existing site was surveyed to determine the extent of the existing drainage channel, manhole locations and existing falls.
- Visual and intrusive investigation of the existing drainage network.
- Buried service identification and tracing.
- Coordination with the client regarding allowable surface water discharges.
- Hydraulic design of surface water ACO channels and new surface water drainage runs, futureproofed considering enhanced storm intensities.
- Coordinated design including resurfacing and new tactiles along platform edge.
- Installation (by BCM Construction) of drainage, tactiles and platform resurfacing.
Outputs and Benefits:
Public Safety: Removal of a significant tripping hazard in an area subject to high pedestrian flow will reduce the number of safety incidents at the station.
Flood Prevention: Incidence of ponding of water at this location should alleviate crowding issues (when avoiding standing water) and improve customer satisfaction at the station.