Since the internal property flooding in June 2012, the public and private underground drainage systems have been traced, surveyed and capacity assessed.
Repairs on the defects found in the drainage system were completed in October 2013 and the existing underground drainage capacity maximised, which has helped reduce the frequency of flooding.
However, the underground drainage systems in the area may still be overwhelmed in heavy rainfall.
Short Term Measures
The Regional Community Resilience Group has facilitated the creation of a local community plan which co-ordinates residents, emergency services and government agencies in order to help mitigate the impact of flooding in the area.
The Community Plan for the area was completed early in 2015 and NI Water along with the other agencies has certain obligations under this plan. The agencies have also increased maintenance activities and prioritised the flooding ‘hot spot’ in terms of flooding response and clean up.
NI Water completed work on a £100K project in October 2013, which has helped to reduce the risk of flooding.
The Department for Infrastructure Rivers adopted the undesignated watercourses in early 2015 has undertaken work to improve the structural condition of these watercourses.
Medium Term Measures)
Phase 1a Sicily Park/Marguerite Park
NI Water has taken the lead in a multi-agency project to alleviate flooding in the Sicily/Marguerite Park area of South Belfast, and has been working to design the most appropriate long-term solution. This has included discussions with key landowners to investigate the practicalities of a scheme being undertaken within private lands. However, despite the best efforts of all parties, this option has not been possible.
This scheme will now be incorporated into the larger Glenmachan Project, which will cover flood alleviation for the wider west and south Belfast areas. This larger project will be undertaken in two stages. Work is now underway to advance the first stage which represents an estimated investment of £7.5M and will involve laying a large diameter sewer along Sicily Park, across the Lisburn Road, underneath the main Belfast to Dublin railway line down into Musgrave Park.
Route of proposed new sewers – Sicily Park to Musgrave Park
Work will commence with site investigation and design development in October 2018, with a target construction start of September 2019.
Following completion, NI Water will update the public regarding the second stage, which is a substantially larger capital investment project.
NI Water will continue to liaise closely with residents and Elected Representatives regarding progress on both stages of the Glenmachan Project.
Phase 1b Greystown/Upper Malone
Work commenced on this project in January 2018, with BSG Civil Engineering Ltd appointed as the main contractor. It is anticipated that the work will take approximately 18 months to complete.
This is a multi-agency project representing a £4M investment, jointly funded by NI Water and the Department for Infrastructure (DfI) Rivers. The scheme involves the upgrading of the existing combined sewers and the DfI Rivers culvert from Upper Malone Road to Finnis Close, and when complete will significantly reduce the risk of ‘out of sewer’ flooding and environmental pollution in the area.
Works are progressing well, with pipe laying now complete along Malfin Drive / Upper Malone Park, and currently continuing along Greystown Avenue.
Works on Upper Malone Park
Work has also commenced on the Upper Malone Road, with weekend work currently being undertaken to install a temporary traffic island to assist with traffic management, and lay sewer pipes across the road. During these weekend works, a temporary lane closure will be in place with two way traffic maintained with the use of temporary traffic signals.
Sewer laying work will also be undertaken on the Upper Malone Road from 24th September until the end of November. During the weekday works normal traffic flow will be maintained with a temporary traffic lane open in each direction.
Normal working hours will be 8.30am – 5.30pm for weekend and weekday works.
Construction works on the Upper Malone Road will be suspended during the Department for Infrastructure Christmas Embargo Period.
NI Water will continue to liaise with residents groups and local elected representatives throughout the construction phase of the Greystown/Upper Malone Project, and on the proposals for Sicily Park/Marguerite Park.
Orchardville - Flood Alleviation Proposals
Following an extensive feasibility study a Business Case was completed with a preferred option for further work at Orchardville.
Short Term Measure
A short-term measure was identified to help further reduce the risk of flooding in the interim. This involved the construction of 2 overflow chambers including a screen and construction of an emergency overflow pipe from the existing sewerage network in Orchardville Crescent allowing relief during periods of heavy rainfall.
This work was completed in February 2016.
Long Term Measure
The longer-term option recommends the upgrade of the Orchardville Wastewater Pumping Station and the re-direction of pumping main discharge from the existing combined sewer on Finaghy Road North, to a new combined sewer currently proposed under the Phase 1a Sicily Park/Marguerite Park project.
In the interim the Regional Flood Resilience Community Group plan to visit Orchardville to facilitate the development of a Community Plan for the area.
NI Water will continue to liaise with residents groups and local elected representatives on the proposals for Sicily Park/ Greystown/Glenmachan and the Orchardville area.
Anyone with any questions about the project can contact NI Water's customer relations team via Waterline on 03457 44 00 88 or by emailing firstname.lastname@example.org, quoting 'South Belfast Flood Alleviation Schemes.'