Saturday, February 10, 2007
flood prevention
COLDHARBOUR FLOOD RELEIF PROJECT.
RUSKIN PARK FAWNBRAKE AVE COLDHARBOUR LANE RAILTON ROAD TULSEHILL
Aim
The purpose of this project is to reduce the risk of sewer flooding at 417 properties in the Brixton area of Lambeth. The number of properties may change as more information becomes available.
As well as disrupting people's lives and businesses, sewer flooding can be an unpleasant and distressing experience - so it is vital that we make improvements to reduce the risk of it happening
Background
Reports of flooding at a small number of properties had been recorded by Thames Water prior to 2004, but there were insufficient numbers to justify the development of a strategic solution. Since 1999 a number of properties in the Rattray Road area have been protected against flooding by Thames Water by the installation of drainage devices.
Following a high number of reports of flooding in 2004 a joint task force, created by the London boroughs of Lambeth & Southwark, assisted Thames Water in identifying additional properties at risk of flooding.
A study to identify the cause of flooding was undertaken by Thames Water between July 2005 and July 2006. The study included investigations into the flow within the Effra Trunk Sewer, monitoring of groundwater levels, sewer flow monitoring, and the development of a hydraulic model.
Results of engineering study
The main results of the study are as follows:
- The sewer network is clear of debris, maintenance of the sewers in this area is effective and is not the prime cause of flooding in this catchment.
- There does not appear to be significant correlation between high flows in the Effra Trunk Sewer, high groundwater and sewer flooding.
- The trunk sewers have adequate capacity to carry the flows generated by the combined sewer catchment in the Brixton area.
- Flooding occurs during storm rainfall events due to the lack of hydraulic capacity of the local sewer network.
- A number of solutions to improve the hydraulic performance of the network have been identified. The solutions include increasing sewer capacity, flow diversion and storage. Solutions have been identified to avoid flooding downstream.
Project Proposals & Programme
The major elements of the project are as follows:
| | Element of work | Provisional programme |
| | | |
| | Sewer Upsize | Summer 07- Spring 08 |
| 1 | Fawnbrake Avenue | |
| 2 | Flaxman Road & Eastlake Road | |
| | | |
| | Storage & pumping station | Spring 08 - Autumn 08 |
| 3 | Millbrook Road & Coldbarbour Lane, Wyck Gardens, | |
| | | |
| | Flow Diversion | Summer 07- Spring 08 |
| 4 | Northway Road ( through Ruskin Park, crossing Denmark Hill ) | |
| 5 | Tulse Hill | |
| | | |
| | Major tunnelling, sewer upsizing, storage & pumping station | |
| 6 | Rush Common, Railton Road, Kellet Road, Mervan Road,Talma Road, Effra Parade, Dexter Road Adventure Playground. | 2008 |
| | | |
| 7 | Installation of additional drainage devices to protect individual properties. | 2007 |
Communication with Stakeholders
This is a major flooding project which will impact on a high number of stakeholders and customers in the area and is likely to include a number of planning applications. Thames Water's communication plan includes the following:
- Briefing L B Lambeth Officers, including streetworks coordination
- Briefing L B Lambeth Members
- Letters/leaflets to customers
- Press releases
- Customer Drop in sessions (exhibitions) in advance of planning applications and works
- One to one meeting with customers
- Consultation with land owners in accordance with Thames Water code of practice
- Road signing, advanced warning & diversion routes etc
Andy Wolfe
Project Manager
Thames Water Engineering
February 2007
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