Case study:Day Brook Restoration - Gedling

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Location: 52° 59' 39", -1° 8' 15"
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Project overview

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Status Complete
Project web site
Themes Flood risk management, Habitat and biodiversity, Urban
Country England
Main contact forename John
Main contact surname Brewington
Main contact user ID User:John Brewington
Contact organisation Environment Agency
Contact organisation web site http://www.environment-agency.gov.uk
Partner organisations Groundwork Greater Nottingham, Environment Agency, Nottinghamshire County Council, Gedling Borough Council
Parent multi-site project
This is a parent project
encompassing the following
projects
No
Project picture

Project summary

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This project restored natural features to a section of the Day Brook as it flows through a small park on the outskirts of Nottingham city.

The brook was moved from the existing heavily modified and shaded channel into a more natural course. Brook length has been increased with the introduction of meanders along with shallower, soft banks and variation in flow and bed conditions. We aim to improve water quality through the planting of marginal vegetation and the creation of a reed bed at the outfall of a surface water sewer.

With the material produced from the channel excavations, a shallow bund has been constructed to retain flood waters within the park in order to help reduce flooding of downstream properties.

In an effort to raise awareness of the watercourse and to create a more attractive park environment, 2 new bridges now take an existing path over the new brook channel.

This part of the brook is one of the few sections not within a culvert as it flows through Gedling Borough. Downstream the brook mostly flows within a heavily modified channel and the entire length is subject to pollution from diffuse, urban sources.

This project is a sister project to the Day Brook rain gardens - http://restorerivers.eu/wiki/index.php?title=Case_study%3ADay_Brook_Rain_Gardens

Restoration work commenced in February 2014 and was completed in May 2014.

Photos of the works are available at https://www.flickr.com/photos/environment-agency/sets/72157644692138259/?view=sq.

Increase community awareness of urban catchment challenges.

Monitoring surveys and results

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Lessons learnt

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Image gallery


Day Brook before
Day Brook before
Day Brook construction
New channel and reed bed 23 April 2014.JPG
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Catchment and subcatchment

Catchment

River basin district Humber
River basin Lower Trent and Erewash

Subcatchment

River name Day Brook from Source to River Lean
Area category 10 - 100 km²
Area (km2)
Maximum altitude category 100 - 200 m
Maximum altitude (m) 153
153 m
0.153 km
15,300 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Suburban
Waterbody ID GB104028052860



Other case studies in this subcatchment: Day Brook Rain Gardens


Site

Name
WFD water body codes GB104028052860
WFD (national) typology
WFD water body name Day Brook from Source to River Lean
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) 115
115 m
0.115 km
11,500 cm
Project started
Works started 2014/02/03
Works completed
Project completed
Total cost category
Total cost (k€)
Benefit to cost ratio
Funding sources Environment Agency - Nottinghamshire County Council - Gedling Borough Council - B&Q

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design 1 - 10 k€ Groundwork Greater Nottingham Paul Crawford
Stakeholder engagement and communication Less than 1 k€ WatersideCare Lee Copplestone
Works and works supervision 100 - 500 k€ Groundwork Greater Nottingham Paul Crawford
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure Flood risk management
Hydromorphology Channel pattern/planform, Quantity & dynamics of flow, Width & depth variation
Biology
Physico-chemical Nutrient concentrations, Specific synthetic pollutants, Oxygen balance
Other reasons for the project Community demand, Landscape enhancement


Measures

Structural measures
Bank/bed modifications Channel reprofiling, Recovery of channel morphology
Floodplain / River corridor Floodplain reconnection
Planform / Channel pattern Channel naturalisation, Re-meandering
Other
Non-structural measures
Management interventions
Social measures (incl. engagement) Awareness raising
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



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Additional links and references

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Supplementary Information

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