COMHAIRLE CONTAE ÁTHA CLIATH THEAS
SOUTH DUBLIN COUNTY COUNCIL
MEETING OF ENVIRONMENT, PUBLIC REALM AND CLIMATE CHANGE SPC
Wednesday, November 25, 2020
HEADED ITEM NO.
HEADED ITEM: M. McAdam
Update on Minor Flood Alleviation and Surface Water Schemes
REPLY:
SURFACE WATER MINOR WORKS PROGRAMME 2020 and 2021
- Minor Surface Water Capital Works 2020:
Provision was made for the following surface water minor capital works and assessments to be carried out during 2020 at a cost of €435k. However with the Covid 19 situation in 2020 several of these works have had to be deferred:
|
Location |
Project Details |
Projected Exp. For 2020 |
|
Rathcoole Park |
Regrade River bank to alleviate overspill during heavy rainfall migrating down to Rathcoole village. €50,000 est. At design stage. Works deferred to 2022. |
€0 |
|
Tay Lane Rathcoole |
Road Design required to Regrade road and allow installation of upsized Surface Water pipe. €80,000 est. At design stage. |
€0 |
|
Templeogue Village Main Street |
Initial assessment and feasibility for new surface water sewer – slit trenches to determine location of underground services. Works planned for early 2021. |
€0 |
|
Old Lucan Road near village centre |
New surface water pipeline required to facilitate road drainage. €160,000 est. At design stage. |
€0 |
|
Corkagh Park |
Level Survey of existing flood alleviation works and desiltation of channels. Move project to Camac FAS. |
€0 |
|
Butterfield Park |
New surface water sewer required to allow separation of surface water and foul to alleviate foul sewer flooding – joint funding to be agreed with IW. Topographical road survey to be completed in 2020 and pipeline design and tender to be advertised by end 2020. Construction to commence in 2022. |
€2,000 |
|
Woodville/Esker Lane |
New surface water pipeline required to connect road gulleys to existing surface water network. |
€30,000 |
|
Cloverhill Road from Palmerstown Woods to Millford Lawns |
New surface water pipeline required to provide improved connection to surface water network. Contract to be tendered and let by end 2021. Reinstatement of Road to by Roads through their improvement project. Works planned for 2021. |
€25,000 |
|
Adamstown Road |
Link from Castlegate to Finnstown to remove Surface Water Pumping Station. Project halted midway and with Law. |
€2,000 |
|
Elkwood Park |
French drain replaced in park to alleviate flooding in Knocklyon Drive. Completed August 2020 |
€40,000 |
|
Fortunestown Road |
Relaying of surface water sewer to accommodate drainage for planned N81 cycle scheme. Completed July 2020 |
€42,000 |
|
Sylvan Avenue |
Relocation of surface water discharge line in the road. Replacement of old damaged sewer to resolve blockage and flooding issue. Project was redesigned during construction to avoid trunk watermain that was incorrectly mapped. Project to be completed by end of 2020. |
€40,000 |
|
Corner Park, Newcastle |
Upsizing of diverted surface water sewer |
€50,000 |
|
Idrone Knocklyon |
Surface water realignment and baffle for insert into manhole to address drainage issues in Knocklyon Green and Avenue, and Delaford Lawns. |
€6,000 |
|
Total |
|
€237,000 |
- Flood Alleviation Minor Capital Works – River & Stream 2020
Provision was made in 2020 of €250k for Flood Alleviation Minor Capital Works to address pluvial and other flooding issues at various locations. However with the Covid 19 situation in 2020 several of these works have had to be deferred:
|
Location |
Project Details |
Projected Exp. For 2020 |
|
Camac and Dodder Rivers |
Clearing of fallen trees and overgrowth. Works complete. |
€45,000 |
|
Poddle River |
Clearing of vegetation. Works complete. |
€30,000 |
|
Jobstown Stream Tributary |
Camera surveys and pipe clearance on pipework and surveying from N81/Deselby to discharge to 525mm. Works to be let by end 2020. |
€5,000 |
|
Owendoher Stream |
Tree survey and clearing of fallen trees and overgrowth. Annual clearing works and tree survey complete. Further tree removal on banks to be carried out as per survey recommendations. |
€45,000 |
|
Oldcourt Stream |
Outfall bank stabilisation works. Ecological impact assessment in progress and plan to start works by end 2020. |
€45,000 |
|
Mill Ponds & Camac Screen at Toyota |
Replace River Screens. Delayed until 2021 as screen design has to be approved by Camac FAS. €15,000 est. |
€0 |
|
Ballycragh Lake |
Clear out debris and silt from lake. Scoping to be carried out and ecological impact assessment. Deferred to 2021. €25,000 est. |
€0 |
|
Telemetry installations and upgrades |
2 no. further cameras to be installed to show river screens at N81 Jobstown Stream and on Camac at Mill Lane and Nangor road. Partially complete and awaiting ESB connections. Remainder of works plan to complete by end 2020. |
€40,000 |
|
Total |
|
€210,000 |
SURFACE WATER MINOR WORKS PROGRAMME 2021
- Minor Surface Water Capital Works 2021:
A provision has been made for the following surface water minor capital works and assessments to be carried out during 2021 at a cost of €435k:
|
Location |
Project Details |
Projected Exp. For 2021 |
|
Templeogue Village Main Street |
Initial assessment and feasibility for new surface water sewer – slit trenches to determine location of underground services |
€220,000 |
|
Palmerstown Woods |
New surface water pipeline required to provide improved connection to surface water network |
€210,000 |
|
Rathfarnham Lake supply upgrade |
Relaying of part of surface water supply pipeline in private property and installation of alarm. |
€5,000 |
|
Various projects carried over from 2020 per above, to be programmed and progressed |
|
|
|
Total |
|
€435,000 |
The majority of the above schemes are at design stage and are subject to detailed design and full budgetary estimates.
- Flood Alleviation Minor Capital Works – River & Stream 2021
A provision has been made in 2021 of €250k for Flood Alleviation Minor Capital Works to address pluvial and other flooding issues at various locations as follows:
|
Location |
Project Details |
Projected Exp. For 2021 |
|
Camac River |
Clearing of fallen trees and overgrowth |
€20,000 |
|
Dodder River |
Clearing of fallen trees and overgrowth |
€25,000 |
|
Poddle River |
Clearing of vegetation |
€30,000 |
|
Jobstown Stream Tributary |
Upsize/replace pipework from N81/DeSelby to discharge to 525mm to remove botteneck. |
€45,000 |
|
Mill ponds and Camac screen |
Replace river screens |
€15,000 |
|
Owendoher Stream |
Clearing of fallen trees and overgrowth per tree survey 2020 |
€25,000 |
|
Oldcourt Stream |
Outfall bank stabilisation works |
€30,000 |
|
Ballycragh Lake |
Clear out debris and silt from lake |
€60,000 |
|
Total |
|
€250,000 |