Case study:Nobles Green Ditch River Restoration

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Location: 51° 35' 11", 0° 36' 18"
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Project overview

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Status Complete
Project web site
Themes Habitat and biodiversity, Hydromorphology, Water quality
Country England
Main contact forename Matt
Main contact surname Butcher
Main contact user ID
Contact organisation
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project
encompassing the following
projects
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Project summary

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Installing woody debris flow deflectors to improve habitat and morphology of Nobles Green Ditch. Nobles Green Ditch has historically ben heavily modified to improve flood protection and land drainage. It is failing to meet its WFD objectives for invertebrates. The mitigation measures assessment for the river revealed that measures were needed to improve in-channel morphological diversity. This project aims to address these issues.

Monitoring surveys and results

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Research undertaken by the wildlife trusts concluded that 147 species of river invertebrates are closely associated with woody debris. These features directly provide habitat for such species. Furthermore, woody debris flow deflectors improve river morphology, creating differential areas of fast and slow flowing water. Energetic, faster flowing water improves sediment transfer, helping to keep gravels clean. It is also important for the formation of features such as riffles and pools as well as meanders. Slower flowing water provides a refuge for fish and invertebrates from high flows, and allows silt to settle out, eventually forming berms which will improve diversity of flow and plant communities.

Lessons learnt

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Involving communities in river restoration projects not only improves understanding and ensures long term support for projects but volunteers can help keep project costs down, enabling us to achieve more limited budgets.


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Catchment and subcatchment



Site

Name
WFD water body codes GB105037028743
WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body No
National/international site designation
Local/regional site designations
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 500 - 1000 k€ 1000
1,000 k€
1,000,000 €
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



Additional documents and videos


Additional links and references

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Supplementary Information

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