Agenda Item No



The Vale of Glamorgan Council


Cabinet Meeting: 15th October, 2012


Report of Cabinet Member for Environment and Visible Services


Llanmaes Flood Alleviation Scheme


Purpose of the Report

1.         To inform Members of the position with a flood risk management scheme for the village of Llanmaes following a recent funding announcement by the Welsh Government Finance Minister.


1.         That Members note plans to progress with the construction phase of the Llanmaes Flood Alleviation Scheme during 2013/14 as a consequence of the full funding now being available.

2.         That a further report be provided to Cabinet and the relevant Scrutiny Committees when the final design details and construction costs for the scheme are known.   

Reasons for the Recommendations

1.         To inform members of recent progress on this important project aimed at reducing future flood risk in the village of Llanmaes.

2.         To ensure that members are kept aware of the relevant details of the scheme as it progresses. 


2.         The site is situated at Llanmaes, some 3.5 miles to the South West of Cowbridge. The site comprises primarily privately owned residential properties. There is also a public house and three farms. A few of the houses in the village are hundreds of year old but the majority were built in the latter half of the last century. The development of the once marshy land, along West Road and what is now Tyle House Close, took place 37 years ago and consists mainly of detached properties.

3.         The area slopes from north to south, with the main drainage artery being the small unnamed stream through the village that discharges to the Llanmaes Brook, which runs along the southern boundary of the village.

4.         The surrounding catchment has been changed from the old enclosure fields, into very large fields for arable use, by the removal of the hedges. Surface water runoff therefore discharges quickly from these fields, sometimes into the roadways via gate entries, through hedges, or via footpaths into the village.

5.         In the past some attempts have been made by the Council to deal with the flooding. A 1.35 m x 1m concrete culvert was laid under the road at Plaisted House, and twin 300 mm diameter plastic pipes take water from Gadlys Road by the Blacksmith’s Arms to the brook running through the village green. This however has not completely solved the flooding problems on Gadlys Road.

6.         A “Pre-Feasibility Study” of the flood risk issues in Llanmaes was completed in 2002 and some strategic outline scheme proposals were recommended, including;

·               Initial appraisal at pre-feasibility suggests that it would be technically & economically viable to promote capital flood alleviation improvement work at this location.

·               It will be necessary to liaise with the landowners and the statutory undertakers at an early stage.

·               It is essential that a comprehensive catchment analysis, and statutory undertakers enquiries, be carried out prior to any specifications being drawn up for the requisite works.

·               A detailed topographical survey of areas of Llanmaes will be required.

·               Ordinary Watercourse Consent will be required for the scheme.

·               The most recent incident affecting both properties and highways occurred in November 2007 when Gadlys Road and two properties were affected. Prior to this, flooding has occurred on average every 5 years often with properties affected.

Relevant Issues and Options

7.         The Welsh Government confirmed its commitment to fund the scheme to the next stage of Project Appraisal Report (PAR) with its match funding at 85% with the Council providing the 15% match funding.

8.         Following a competitive tendering process consultant Martin Wright Associates were appointed to complete the Project Appraisal Report. 

9.         The object of the appraisal was to identify a preferred scheme option to provide alleviation of flooding to the residential properties at Llanmaes. The appraisal was carried out using DEFRA guidance.

10.      In order to address the flooding problem, six options were considered. These options included the baseline “do-nothing” option; a “maintain” option and four “improve” options. Two of the improve options have been considered to the 1 in100 year indicative standard which is considered appropriate for such improvement works in this part of the Vale of Glamorgan.

11.      The preferred solution, Option 6 of the appraisal, involves laying a 900mm diameter drain from the Village Green to the Llanmaes Brook at Bridge House Farm via West Road. This drain would act in tandem with the existing stream as well as intercepting all those flows that run down the western catchment roads. This option was identified as the optimum solution after consideration of all the parameters.

12.      Following submission of the appraisal report to Welsh Government confirmation was given to proceed to the next stage of the scheme that of detailed design and contract document preparation. Initially it has been necessary for the Council to fund this phase of the project utilising its revenue budgets and this decision was taken early this financial year to ensure that the scheme kept progressing, whilst the major funding element was awaited. 

13.      Following a competitive tendering process consultants 'Mott MacDonald' were appointed to complete this stage of the scheme. 

14.      The object of the design was to confirm and proceed with the preferred option as identified in the PAR.

15.      Mott MacDonald are currently carrying out the detailed design of the scheme and it is anticipated that the design will be completed by the end of November 2012. After which time a further report will be provided to members advising of the full construction details of the scheme 

16.      The Welsh Government Finance Minister and Assembly Member for the Vale of Glamorgan, Jane Hutt, issued a press release on 9 October 2012 advising of   Increased Investment in Welsh Government funding for its Flood Alleviation Programme, including that for Llanmaes. This now enables a suitable flood alleviation scheme for the area to be constructed during 2013/14

17.      The Council will be required to apply to Welsh Government for this funding in accordance with the requirements and conditions of the grant aid funding.

Resource Implications (Financial and Employment)

18.      The capital cost for each of the options identified in the PAR was calculated and the cost of the preferred option was estimated at £1.114m. It is estimated that when completed the total cost for the feasibility and design stage work will be circa £65k. The funding received to date from the Welsh Government totals £11k.

19.      To take the scheme forward to detailed scheme design and construction, a Capital bid of £167k for the provision of the Council's 15% match funding has been submitted for 2013/14.

Sustainability and Climate Change Implications

20.      This area is frequently flooded and whilst there is no empirical evidence that this particular flooding frequency is linked to changes in the environment affecting rain fall patterns, there is no likelihood of the flood risk reducing without some form of physical intervention. The scheme will be designed to take into account national predictions of future environmental change.   

Legal Implications (to Include Human Rights Implications)

21.      There are no legal implications to this report.

Crime and Disorder Implications

22.      There are no Crime and Disorder implications to this report.

Equal Opportunities Implications (to include Welsh Language issues)

23.      There are no Equal Opportunities implications to this report.

Corporate/Service Objectives

24.      Implement the Shoreline Management Plan along with improved drainage and flood control measures.

Policy Framework and Budget

25.      This report is within the policy framework and budget.

Consultation (including Ward Member Consultation)

26.      Local ward members have been involved in the efforts to obtain this funding in the past as have the local Community Council. Due to timescale issues neither have been consulted on the details of this report, though all are aware of the recent funding announcement.

Relevant Scrutiny Committee

27.      Economy and Environment.

Background Papers

Press release dated 9 October 2012 from the Welsh Government Finance Minister and Assembly Member for the Vale of Glamorgan, Jane Hutt.


Contact Officer

Andrew Loosemore - Operational Manager Highways


Officers Consulted

Accountant Visible Services and Building

Senior Accountant - Capital

Operational Manager Legal Services


Responsible Officer:

Miles Punter - Director of Visible Services and Housing