The Council proposes to carry out land drainage improvement and culvert network rehabilitation works to an unnamed ordinary watercourse that originates from Llanwonno Road to outfall into the River Cynon, adjacent to Penrhiwceiber Road.
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Scheme Summary
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Strategic Flood Risk Area
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Mid Cynon 2
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Flood Action Plan Reference
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SFRA7 A2
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Location
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Llanwonno Road, Mountain Ash
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Properties Benefitting
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Approximately 20 residential properties and 1 business
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Type of scheme
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Culvert Network Rehabilitation
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Status
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Environmental Impact Assessment (Land Drainage Improvement Works) Regulations 1991 Notice live
Awaiting funding for construction phase
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Funding Source
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Welsh Government Flood and Coastal Erosion Risk Management Capital Grant
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Scheme Background
Mountain Ash is noted as an area of high surface water and ordinary watercourse flood risk based on Natural Resources Wales’s (NRW) Flood Risk Assessment Wales (FRAW) maps. The community of Mountain Ash is also identified as the 75th most at risk community for ordinary watercourse and surface water flooding in Wales according to the Communities at Risk Register (CaRR) 2024 which was developed by NRW to provide an objective means of identifying risk and prioritising flood risk management activities at a Wales-wide, community level.
The consequences of being a high-risk flood area have been particularly evident over the past 5 years, with Storm Dennis in 2020 and Storm Bert in 2024 leading to widespread internal flooding across the community.
Proposed Scheme Objectives
- Reduce risk to life by reducing the number of people exposed to risk of flooding of significant depth and velocity.
- Reduce community disruption by reducing the amount of residential and commercial property exposed to flood risk.
- Result in no detriment to downstream receiving River/Watercourse
- Improve community resilience to flood events and climate change, promoting sustainability and wellbeing.
- Deliver a preferred option that works with natural processes and promotes green infrastructure.
- Enhance local biodiversity and support the resilience of ecosystem services.
- Improve the resilience of flood risk assets against climate change - Promoting accessibility and low maintenance requirements.
- Reduce the impact of climate change – mitigating the extent of the projects carbon footprint.
- Improve community wellbeing through the enhancement of local amenity.
Proposed Scheme Description
The Council proposes to carry out land drainage improvement works on an unnamed ordinary watercourse that originates at Llanwonno Road to the rear of Arthur Street in Mountain Ash and conveys to its outfall within the River Cynon.
The location of these works will take place in and around Llanwonno Road, Arthur Street and Bush Road within Mountain Ash.
The works are intended to structurally rehabilitate the culverted ordinary watercourse network via internal relining and patch repair methods. This will reduce the risk of structural failure to the existing ordinary watercourse culvert networks. These improvement works also form part of council’s Flood Action Plan, which has been designed to actively manage the risk of surface water and ordinary watercourse flooding to properties within RCT.
Environmental Impact Assessment (Land Drainage Improvement Works) Regulations 1999 Notice
The Council does not intend to prepare an environmental statement in respect of the proposed improvement works. With reference to Schedule 2 of the Environmental Impact Assessment (Land Drainage Improvement Works) Regulations 1999, the reasons for not intending to prepare an environment statement are that, considering the characteristics of the improvement works, the environmental sensitivity of geographical areas likely to be affected by the improvement works and the type and characteristics of the potential impact on the environment of the improvement works, it is considered that the proposed works will not have a significant effect on the environment. A notice for these works was served on the 04th April 2025. View the Environmental Impact Assessment (Land Drainage Improvement Works) Regulations 1999 Notice
Flood Risk Management
Highways, Transportation and Strategic Projects,
Rhondda Cynon Taff County Borough Council
Floor 2
Llys Cadwyn
Pontypridd
CF37 4TH
Email: FRM@rctcbc.gov.uk