Design visualization of Cardiff Arena 2024

Update on Cardiff Arena Pre-Enabling Works and Sewer Diversion

Knights Brown are carrying out the pre-enabling works in advance of the Cardiff Arena and Hotel development. Following on from previous communications, we would like to update and advise as we move into the next stage of our works – diversion of the storm-water sewer running underneath Schooner Way and the anticipated timeline for each operation and the adjustments to access this will have in the local area.

Unfortunately, inconsistent ground conditions were encountered along the route of the new sewer.

This has meant that a new construction methodology has had to be been implemented, which is now underway, but has affected the activity dates previously advised. The updated dates are now provided below.

As previously advised, we have provided an alternative footpath around the site hoarding. However, following work by others in relation to a new telecomms mast, the poor condition of the existing footpath within the park has meant the diversion via Lloyd George Avenue will remain in place until the works in the park are completed by others.

click to view welsh map

Locations C and D – 14/10/24

Setup of “over-pumping” equipment that will effectively divert water from C to D to allow our construction of the new sewer to be completed under dry conditions. The generator we require to run these pumps will need to run 24hrs/day. Having assessed the situation We have made the decision to place this in the County Hall car park, approx. 70m away from the nearest residence. In addition, we will also install “noise blankets” that further dampen sound output. A combination of the selected generator location and additional noise mitigation should lead to an output quieter than a passing vehicle.

Location E – 21/10/24

Excavation for manhole SD1 at the start of the newly diverted sewer route.

The Installation of the new sewer pipe linking SD2 to SD1is anticipated to commence 11/11/24.

Location F – 02/12/24

Excavation for manholes SD3 and Car Park connection which also includes removal of an existing manhole at the end of the newly diverted sewer route.

Installation of the new sewer pipe linking SD2 to SD3 is anticipated to commence 06/01/25.

The above phases of the sewer diversion works are scheduled to be completed by March 2025. We understand that our work can cause disruption and we’d like to assure you that we will complete the work as quickly as possible.


Please note that all stated dates could be subject to change in the event of unforeseen issues or weather conditions.

If you have any concerns or queries, please feel free to get in contact with me on 07977091261 or by email at talktous@knightsbrown.co.uk.

Tracy Beall
Community Engagement and Social Value Officer

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