Case study:Grantham Blue Green - Urban Reach

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Location: 52° 54' 49.38" N, 0° 38' 17.41" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity
Country	England
Main contact forename	Alice
Main contact surname	Atkins
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://Environment%20Agency
Partner organisations	Environment Agency
Parent multi-site project	Case_study:Upper Witham Restoration
This is a parent project encompassing the following projects	No

Project picture

Project summary

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This project was undertaken to improve river habitat in a section of the Upper Witham through Urban Grantham. It followed on from an urban opportunities study and similar work at Dysart Park (Rivers Trust) and Wyndham Park Phase 1 (EA). There is a near continuous, accessible, river corridor along the river through the town which takes in 2 large, popular parks. The river here has been heavily modified which has had a significant impact on the habitat and its appearance.

The works aimed to improve the habitat, look of the river and to try and reinstate some natural river processes within the constraints of an urban environment e.g flood risk. River works were complemented by the planting of wildflower meadows and urban wetlands along the river corridor.

The river work involved daylighting, tree hinging, berm creation and the addition of gravel to the channel at 4 sperate project sites. Local volunteers, including the River Care group in particular assisted contractors in undertaking the works.

Monitoring surveys and results

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Baseline monitoring has been undertaken by EA for fish and invertebrates. Sample site Stonebridge Close, Sedgewick Meadows and Queen Elizabeth Park. Impact will be assessed over time.

Lessons learnt

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Delivery of a large programme of works to deadline through COVID has been challenging but works came in within budget. Working in an urban environment is difficult and successful project delivery relies on engagement with the many stakeholders from the outset, particularly the local community. If new project officers are picking up the delivery of works and were not involved in the initial project development, then it is important that a through handover of work takes place.

Image gallery

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Gravel being added to channel.

Newly installed brushwood berm in foreground (Queen Elizabeth Park)

Newly dug wetland feature in Queen Elizabeth Park prior to volunteer planting.

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Anglian River basin Witham Subcatchment River name Upper Witham Area category 10 - 100 km² Area (km2) Maximum altitude category Less than 100 m Maximum altitude (m) 4646 m <br />0.046 km <br />4,600 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB105030056760 Other case studies in this subcatchment: Aubourn Rock Ramp and Habitat Works, Belton Floodplain Reconnection and River Restoration, Dysart Park, Grantham Habitat Improvement, Little Ponton, Manthorpe Floodplain Reconnection, Papermill Weir Section in-channel restoration, River Witham Great Ponton, Stainby Road, Colsterworth, Syston and Barkston Restoration, Upper Cringle Floodplain Restoration Project... further results Site Edit site Name Grantham Urban Reach WFD water body codes GB105030056780 WFD (national) typology WFD water body name Witham - confluence of Cringle Brook to confluence Brant 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 Yes Invasive species present No Species of interest Native Crayfish / Brown Trout 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 Edit project background Reach length directly affected (m) 13001,300 m <br />1.3 km <br />130,000 cm <br /> Project started 01/07/2021 Works started Works completed Project completed Total cost category 100 - 500 k€ Total cost (k€) 313313 k€ <br />313,000 € <br /> Benefit to cost ratio Funding sources Leader+ European Structural Fund, EA, SKDC 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 Edit reasons for restoration Mitigation of a pressure Flood Risk Hydromorphology Biology Fish Physico-chemical Phosphate Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Tree Hinging adding gravel, berm creation, daylighting. Floodplain / River corridor Planform / Channel pattern Other Urban wetlands and wildflower meadows Non-structural measures Management interventions Social measures (incl. engagement) Big engagement programme with local community. Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit 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 Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Project Case Study Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information