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Glynneath Flood Alleviation Scheme

Current flood risks

  • Flooding to properties on Rock Street and Robert Street from the Gelliceibryn Brook. The existing drainage system does not have enough capacity to convey surface water during certain storms.
  • Flooding to Glynneath town centre. This is from a ford on Glynmelyn Road located on the Nant Y Gwyddyl to the east of Glynneath.

Proposed works

The proposed works will be in two phases.

Works are likely to start August 2022 until November 2023.

Phase 1 and Phase 2 – duration likely to be 14 months

Phase 1 - Works at Rock Street and Lancaster Close.

  • The construction of a new inlet structure / trash screen in the woodland
  • An overflow culvert from the woodland to the River Neath to divert flood flows.

Phase 2 - Works on Nant y Gwyddyl

  • The construction of a new culvert on the ford on Glynmelyn Road. 

Current stage

All the pipework has been installed at from Lancaster Close to the River Neath. 

The intake works are near completion with finishing works to be complete within the next month; July 2023. The drainage improvement and tarmac works at Gelliceibryn are near completion.

The outstanding works are chamber covers to be installed along Lancaster Close, fencing and tarmac around the intake structure.

Phase 2 of the works have already started with service diversions being undertaken by utility companies and Knights Brown.


  • Reduce the risk of flooding to residential and commercial properties from the Gelliceibryn Brook and Nant Y Gwyddyl ford.
  • Protection to the centre of Glynneath, including Rock Street, Robert Street and Trem Y Glyn Carehome.

Likely disruption

  • Lane closures on Lancaster Close for chamber cover installation.
  • Access to Gelliceibryn will my managed during finishing works.
  • Increased construction traffic to the site compound located in the south field off Park Avenue.
  • Road Closure of Glynmelyn Road at the ford. A temporary access road will be available during the construction period to maintain access to Glynmelyn Road from Heol Y Glyn (A4109).


The scheme is funded by the Welsh Government and Neath Port Talbot County Borough Council. 

The current investment value of this scheme is in the region of £3 million pounds.


If you have any queries on the scheme please contact Neath Port Talbot County Borough Council Drainage department:

Drainage Project Manager
Richard Coleman pref