The Pednormead End project
The scheme is located in the Pednormead End community in Chesham. The scheme has 2 objectives:
- reduce the risk of localised flooding
- ensure the local culvert remains safe and does not deteriorate
We're committed to managing flood risk and the proactive maintenance of our structure. This is one of several flood risk management projects.
Background
In 2015, Atkins (a consultancy group) investigated flood management options for Pednormead End. We used their findings to develop this project.
The investigation showed that over 100 homes are susceptible to potential flooding in Pednormead End, Chesham.
Previous (and possible future) flooding in this area is caused by:
- excessive surface water
- water rising over the top of the banks on the River Chess (caused by heavy rain)
- rising groundwater
Flooding at Pednormead End has occurred for over 100 years. The most extensive flooding happened in 1918, but more recent flooding happened in 2001, 2006 and 2014.
Property Flood Resilience (PFR) packages
The Property Flood Resilience (PFR) packages provide property owners with practical and cost-effective measures which reduce the amount of water entering buildings.
PFR help to reduce flood risk by identifying:
- products which are appropriate for the type of flooding experienced
- requirements and constraints of the property itself
- the needs of home and business owners
There is a range of measures which can be used to limit water entry including:
- barriers on windows and doors
- use of non-return vales to prevent backing-up of floodwaters
- automatically closing airbricks and pump systems
We carried out a number of webinars in 2021. You can view our virtual event question and answer session summary.
Update - January 2025
We will soon install barriers outside the Queen’s Head public house on the junction of Pednormead End and Church Street. This will be a temporary measure to prevent vehicles parking on the footpath. Bollards previously in place have been damaged over the years and a suitable permanent alternative is being assessed. We will have a single overnight closure in place in February 2025 for our operatives to complete this work.
Later in the spring we will have several nights where our operatives will be working in the area using Ground Penetrating Radar (GPR) to explore and identify any issues that need fixing.
We appreciate local frustrations with the duration of the scheme at Pednormead End. During this time, as well as working on design alternatives for this scheme, we have completed a number of other flood alleviation measures, both in Chesham and across Buckinghamshire. Our mitigation measures have helped to reduce the risk of flooding for local properties. We are currently reviewing the full impact of these additional measures to inform works on the culvert. Our first priority is the safety of the local community; however, we are reviewing proposed works to minimise disruption for nearby residents, businesses, and other affected stakeholders.
The flooding model review, incorporating the impact of recent schemes and to the latest standards, is currently underway and further updates will be made available through this page in due course. We will ensure that nearby residents and affected parties are kept up to date. Significant updates will be included in the Highways Highlight report, please sign up to be added to our newsletter here: Highways Highlight Subscribe | Buckinghamshire Council.
Previous works
You can see previous updates and details on plans for our work at Pednormead in the list below.
We've postponed the planned culvert replacement construction work on Pednormead End Chesham, which was due to start on 27 June 2022. It will now start in summer 2023.
This is due to technical issues found during our pre-construction surveys.
The other part of the flood scheme, Property Flood Resilience measures, (offered to houses impacted by internal flooding) is now close to being completed and this will help to mitigate against floods which may occur in the future for those properties at risk.
We apologise for the inconvenience caused and thank you for your patience.
If you have any queries, you can reach us at [email protected] or call us on 01296 382416.
Background of the culvert replacement
To help reduce flooding during the more frequent flood events, the existing piped culvert that carries a tributary of the River Chess under the Missenden Road is to be replaced with a precast concrete box culvert.
In addition to this work, a section of the Bury Pond culvert that runs under Church Street near the Queens Head Pub, will be also repaired. To help mitigate high ground water levels in the area, filter drains will also be installed on either side of the new box culvert.
Design
The design has been careful to ensure the size of the new culvert is suitable to fit into the restricted space available and ensuring that its capacity does not push more flood water downstream.
Project stages
The first stage of the project was undertaken between June 2020 to December 2020 and began by focusing on lowering and diverting utility services ahead of the culvert replacement.
Unfortunately, due to the complexity of the utility diversions and high ground water levels, the project was put on hold with the intention of resuming work in summer 2021.
Once again high groundwater levels in 2021 meant it was not safe to resume underground high voltage electricity diversion works at this time and the project was put on hold once again.
The replacement and scheme overview for Pednormead End
Planned work in 2022
The work planned in 2022 has been postponed to 2023, due to technical difficulties.
The planned work will take 12 weeks to complete and will be carried out in 3 phases:
Phase 1
Diversion of an underground high voltage electricity cable and repair of a damaged section of the Bury Pond culvert that runs under Church Street near the Queens Head Pub.
Phase 2
Replace the existing River Chess culvert from its outlet adjacent to the Queens Head Pub to the Missenden Road/Wey Lane junction and reinstate.
Phase 3
Replace the existing River Chess culvert from the Missenden Road/Wey Lane junction to its inlet adjacent to house number 5 Missenden Road and reinstate.
Resurface carriageway and replace road markings.
The project
The project is a £3.3m flood management project to limit future damage caused by flooding, including:
- building a bigger culvert under Church Street
- offering property flood resilience packages to every affected home
Benefits
There are multiple benefits of the proposed project, including:
- improved flood resilience for properties against flooding
- property owners will be increasingly self-sufficient and resilient during a flood event
- improved safety and structural integrity of the culvert under Church Street
- improved drainage of surrounding roads leading to less standing water, reducing the instance of pot holes, and therefore fewer maintenance costs, improved safety and reduced disruption
- enhanced peace of mind, reduced stress and improved quality of life for property owners concerned with flood risk
- businesses able to operate and trade during and after a flood event
Project progress
By the end of June 2022, installation will have been completed for the most part at all properties within the scheme.
This involved receiving listed building consent for 13 properties and Highways Departure from Standards (DfS) consents for flood barriers facing public footpath.
Next steps
The PFR scheme is in its final stages, with the following activities still ongoing:
- snagging (final minor works at properties)
- post installation surveys by the independent surveyors RAB Consultants
- issuing of post installation flood risk reports (PIFRR) to homeowners
Reflections and Recommendations
View our Reflections and Recommendations document (PDF, 1.6 MB)
Contact
If you have any questions about the Pednormead End Culvert replacement, or would like to enquire about how to participate in the Property Flood Resilience (PFR) packages, make contact with us.
Email: [email protected]