COMHAIRLE CONTAE ÁTHA CLIATH THEAS
SOUTH DUBLIN COUNTY COUNCIL

MEETING OF ENVIRONMENT, PUBLIC REALM AND CLIMATE CHANGE SPC

Monday, September 03, 2018

HEADED ITEM NO.

HEADED ITEM: M. Maguire

Update on Flood Alleviation (Including CFRAMS) and Surface Water Schemes

REPLY:

The update on the flood alleviation schemes and the surface water schemes is as follows:

Ballycullen Stream Flood Alleviation Scheme

The 12 month defects period, we continue to monitor all reinstatements to ensure thay comply with the specification and that all green areas grow back to the required standard.

River Poddle Flood Alleviation Scheme 

The River Poddle Flood Alleviation Scheme has progressed to Stage 1 – Scheme Development and Preliminary Design following the appointment of Nicholas O’ Dwyer Ltd as Consulting Engineers on March 20^th 2018.

Current works being carried out under Stage 1 is the collecting of rainfall and river level flow data and advance surveys of existing infrastructure such as culverts along the route, reviewing of SDCC and DCC Planning data along with the gathering of GIS storm water network data to enable Hydrological Analysis and Hydraulic Modelling of flood events. A Draft Hydraulic Report has been completed and is currently under review by SDCC the OPW and DCC.

Preliminary meetings have also been held with stakeholders residing on the route and with the relevant Local Authority Drainage Inspectors to assist in identifying historical problem areas and in regard to the current maintenance of the River Poddle.

Preliminary Design is expected to be completed in late 2018 to early 2019, Public Consultation on the proposed sollutions for the scheme will occur in Q3 and Q4 2018.

Once the prelimainary Design is completed a Part X planning Application will go to An Bord Pleanala, this is expected in Q1 2019. We will then await the decision of the Board, the time scale for this is outside of our control but is gernerall between 6 and 8 months.

Whitechurch Stream Flood Alleviation Scheme

The Whitechurch Stream Flood Alleviation Scheme is a cost benificial scheme, as set out in the Dodder CFRAMS project.The OPW have confirmed funding for this scheme.

The OPW Design office are carrying out some of the design work on this scheme they will produce the Hydraulic modelling this project. In order to progress this modelling they have already completed culvert and channel surveys aswell as topographical surveys. The overall project design and Planning will be carried out by consultant. The consultant will also act as Project Supervisor Design Process (PSDP) for the project. SDCC have completed the procurement and consultants will be appointed in September 2018 to progress this scheme in co-operation with the OPW.

Camac Flood Alleviation Scheme

The overall scheme for the Camac did not meet the OPW cost benefit criteria to progress work on the river in its entirety. A steering group has been set up to consider works at specific locations on the Camac River, SDCC and the OPW have met on site and walked the Camac. The OPW have drafted a brief for the appointment of Consultants to carry out the design of flood alleviation measures at these specific locations and this is currently being reviewed by SDCC and DCC. 

SURFACE WATER MINOR WORKS PROGRAMME:
1 Surface Water Sewer Systems;
Location	Project	Update on Project
Tay Lane, Rathcoole	Flood Alleviation	In Planning - road regrading required to accommodate upsizing of pipes.
Glenmaroon	Localised surface water improvement – to alleviate flooding on Glenmaroon Road.	Works Complete.
Peamount Road, Newcastle.	Ditch to be cleared	Completed May 2018.
Main street, Newcastle.	Main street - Localised surface water improvement	In Planning.
Celbridge Road, Lucan	Surface water improvement scheme – collapsed culvert restoration.	Works complete.
Ballyowen Lane, Lucan.	Surface water improvement scheme - - to address localised flooding and to provide  a discharge pipeline from Public Realm pitch drainage works	Construction has commenced and works to be completed late September 2018
Templeogue Village	Section 1 – provide surface water discharge line from Main Street at Morgue Pub to discharge to existing surface water system on Lane to Riverside Cottages.	Section 1 –Survey is complete. It is hoped that construction will start November 2018
Templeogue Village	Section 2 - Main street - Initial assessment and feasibility study of pipeline along the main street. (anticipated co-funding from IW to be agreed )	Section 2 -Liaison with Irish Water.
Stocking Lane, Rathfarnham.	Provide improved drainage on road	Phase 1- Assess condition of current drainage and Planning. Carried forward from 2017
Old Lucan Road near village	Localised surface water improvement	Multi annual scheme in planning in conjunction with Roads
Butterfield Park	Localised surface water improvement (anticipated co-funding from IW to be agreed ).	In planning.
Nangor Road/Ninth Lock Road Junction, Clondalkin.	Localised surface water improvement	In planning. Carried over from 2017
The majority of the above schemes are at preliminary stage and are subject to detailed design and full budgetary estimates. In cases where the new surface water pipeline will provide additional capacity in the foul sewer, co-funding is anticipated from IW and amounts need to agreed.
2 Flood Alleviation Minor Capital Works – Rivers & Streams;
Location	Project	Update on Project
Camac River	Clearing and regrading	Regrading at Mayfield done in May and minor clearing works in September
Poddle River	Clearing and regrading	Annual clearing works to be carried out September 2018
Jobstown stream	Regrading, dredging and cleaning. Provision of a better aesthetic area to discourage illegal dumping into the stream.	In planning
River CCTV & Telemetry	Provide 4 no. outstations on: - Camac screen at Toyota, Jobstown stream screen before N81 culvert and 2 No. on the Poddle river.	The 2 no. sites on Poddle are complete and further unit to be fitted @ Toyota, Nangor rd. Screen on Camac before end of year. Permission to be sought from Toyota.
Rathfarnham Castle	Clean up and regrade inlet and outlet watercourse to lakes and clean lake.	Completed Aug 2018
Rain Gauge Upgrade	5 sites	In planning
Owendoher Stream	Clearing and regrading	In planning