Case study:River Hogsmill Restoration Project
This case study is pending approval by a RiverWiki administrator.
Project overview
Status | Complete |
---|---|
Project web site | |
Themes | Flood risk management, Habitat and biodiversity, Hydromorphology |
Country | England |
Main contact forename | Dave |
Main contact surname | Bartlett |
Main contact user ID | |
Contact organisation | Epsom & Ewell Borough Council |
Contact organisation web site | http://www.epsom-ewell.gov.uk/EEBC/ |
Partner organisations | Rosebery Housing Association, the Environment Agency, the Countryside Agency, the Big Lottery Fund, Surrey County Council, the Royal Borough of Kingston and the Lower Mole Countryside Management Project |
Parent multi-site project | |
This is a parent project encompassing the following projects |
No |
Project summary
The Hogsmill River is an important wildlife refuge and has great recreational value, but was perceived by many as run down and a shadow of its former self. In places it was steep-sided, concrete-lined, crossed by service pipes and strewn with litter. Despite this, the river which originates as a chalk stream in Ewell still provides a home to fish such as stone loach, minnows and bullhead and if nature lovers are lucky, they can see one of the kingfishers which live along the river.
The Environment Agency has contributed to this project to restore the river and make it a more visible and accessible area for local residents to enjoy with improvements for wildlife and flood defenses.
The benefits of the Environment Agency river restoration work include: an improved river that will attract new wildlife and become a focal point of interest for the local community and which can be used by local schools as an educational resource; creation of a meander and backwater in a previously straightened river, which will improve the habitat for fish; the concrete bed protection on the Bonesgate Stream has been removed which will improve the appearance of the river and the local environment for wildlife; a restored footbridge to complement the adjacent new footbridge and ensuring continued safe access for residents, including wheelchairs and pushchairs; planting of a wildflower meadow, connecting the existing grassland habitats within the river valley to provide benefits for wildlife and especially butterflies; cutting back trees in the existing woodland, allowing light in for other plant life to grow diversifying the habitat and supporting more animals such as dragonflies.
Monitoring surveys and results
Lessons learnt
Catchment and subcatchment
Site
Name | Hogsmill |
---|---|
WFD water body codes | |
WFD (national) typology | |
WFD water body name | |
Pre-project morphology | |
Reference morphology | Actively meandering |
Desired post project morphology | |
Heavily modified water body | No |
National/international site designation | |
Local/regional site designations | Hogsmill Local Nature Reserve |
Protected species present | No |
Invasive species present | No |
Species of interest | |
Dominant hydrology | |
Dominant substrate | |
River corridor land use | |
Average bankfull channel width category | |
Average bankfull channel width (m) | |
Average bankfull channel depth category | |
Average bankfull channel depth (m) | |
Mean discharge category | |
Mean annual discharge (m3/s) | |
Average channel gradient category | |
Average channel gradient | |
Average unit stream power (W/m2) |
Project background
Reach length directly affected (m) | |
---|---|
Project started | |
Works started | |
Works completed | |
Project completed | |
Total cost category | |
Total cost (k€) | |
Benefit to cost ratio | |
Funding sources |
Cost for project phases
Phase | cost category | cost exact (k€) | Lead organisation | Contact forename | Contact surname |
---|---|---|---|---|---|
Investigation and design | |||||
Stakeholder engagement and communication | |||||
Works and works supervision | |||||
Post-project management and maintenance | |||||
Monitoring |
Reasons for river restoration
Mitigation of a pressure | |
---|---|
Hydromorphology | |
Biology | |
Physico-chemical | |
Other reasons for the project |
Measures
Structural measures
| |
---|---|
Bank/bed modifications | |
Floodplain / River corridor | |
Planform / Channel pattern | |
Other | |
Non-structural measures
| |
Management interventions | |
Social measures (incl. engagement) | |
Other |
Monitoring
Hydromorphological quality elements
Element | When monitored | Type of monitoring | Control site used | Result | ||
---|---|---|---|---|---|---|
Before measures | After measures | Qualitative | Quantitative |
Biological quality elements
Element | When monitored | Type of monitoring | Control site used | Result | ||
---|---|---|---|---|---|---|
Before measures | After measures | Qualitative | Quantitative |
Physico-chemical quality elements
Element | When monitored | Type of monitoring | Control site used | Result | ||
---|---|---|---|---|---|---|
Before measures | After measures | Qualitative | Quantitative |
Any other monitoring, e.g. social, economic
Element | When monitored | Type of monitoring | Control site used | Result | ||
---|---|---|---|---|---|---|
Before measures | After measures | Qualitative | Quantitative |
Monitoring documents
Image gallery
Additional documents and videos
Additional links and references
Link | Description |
---|
Supplementary Information
Edit Supplementary Information