Case study:Dysart Park, Grantham Habitat Improvement

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Location: 52° 54' 10.45" N, 0° 37' 44.31" 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	Gail
Main contact surname	Hutchinson
Main contact user ID
Contact organisation	East Mercia Rivers Trust
Contact organisation web site	http://Environment%20Agency
Partner organisations
Parent multi-site project	Case_study:Upper Witham Restoration
This is a parent project encompassing the following projects	No

Project after establishment and naturalisation.

Project summary

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The Upper Witham is the ground water fed headwaters of the Witham supporting important species including Native Crayfish and Brown Trout. Historic changes to the river for milling and land drainage have however degraded habitat especially in urban areas such as Grantham.

The project aimed to restore habitat in an over widened, shaded section of river running alongside a public park in the town. This was done by hinging trees to form berms which helped to narrow the channel and provide lighter. As well as benefiting the habitat, this made the river more visible to near-by residents and park users.

This work reduced the need for EA maintenance of the trees in this section of river.

Monitoring surveys and results

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Visual inspections and photographs of changes. It is clear that even with a resistant clay bed some of the narrowing structures have created scour pool formation.

Lessons learnt

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Plan ahead where native Crayfish could be impacted by a project. Ensure you have the necessary permissions to survey for them and where necessary relocate from the project site.

This project also planned to install a rock ramp on a weir downstream, but this could not be taken forward due to site access during Covid.

Image gallery

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Site before works, Summer 2020. Very shaded and with a silt dominated, over widened

Berm creation using hinged trees, Autumn 2020.

Deep Scour pool between narrowing berms Winter 2022.

Clean gravels and aquatic vegetation forming next to berm. Winter 2022.

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, Grantham Blue Green - Urban Reach, 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 Dysart Park, Grantham Habitat Restoration 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 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 Edit project background Reach length directly affected (m) 100100 m <br />0.1 km <br />10,000 cm <br /> Project started 01/09/2020 Works started Works completed Project completed Total cost category 10 - 50 k€ Total cost (k€) 1638016,380 k€ <br />16,380,000 € <br /> Benefit to cost ratio Funding sources EA, Heritage Lottery Fund (HLF) 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 Improving Local Park Measures Edit Measures Structural measures Bank/bed modifications Day lighting and addition of woody material to form narrowing berms Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Volunteer work parties using the 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 Dysart Park Grantham Restoration Case Study.pdf Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information