Case study:Stainby Road, Colsterworth

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Location: 52° 48' 0.97" N, 0° 37' 32.29" 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 Talton
Main contact user ID User:N/A
Contact organisation Environment Agency
Contact organisation web site http://eastmercia.org/
Partner organisations Environment Agency
Parent multi-site project

Case_study:Upper Witham Restoration

This is a parent project
encompassing the following
projects
No
October 2023 just after construction

Project summary

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This project was delivered by East Mercia Rivers Trust on land owned by Buckminster Estates. Although the Upper Witham which flows through the site had retained a meandering course, the river had become very disconnected from its floodplain with very little gravel in the channel. The aim of the project was to improve the river’s connectivity with the floodplain and in the process, enhance both river and floodplain habitat across the site. This was achieved by the lowering of areas of floodplain across the site and the introduction of limestone gravel riffles and point bars. The selective addition of woody material at certain locations further improved habitat.

A backwater was created along with floodplain ponds and the enhancement of spring tributaries from the valley sides allowed the creation of ground water fed scrapes. All material removed from the valley bottom was landscaped on the valley sides outside of the floodplain and planted with wildflower seed.

Monitoring surveys and results

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Project is very recent so just establishing. We have baseline data for fish and river habitat survey as well as detailed drone topo. Post monitoring work will commence from 24 on wards.

River condition assessment pre and post delivery has taken place.

Lessons learnt

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Allow plenty of time for the development and delivery of a large project such as this where the ecological window for delivery is very limited. Involve all stakeholders at the earliest possible stage of development. Due to the sensitivity of the site, archaeology was a major factor and where this is the case adequate funding should be accounted for to the help manage this risk. Future management of the site is very important to ensure that high quality floodplain habitats are created. Here, the tenant farmer will continue with low density, conservation cattle grazing. The project was carefully designed to not back up any water onto the field immediately upstream.


Image gallery


Newly installed Lincs Limestone Gravel Feature
Post construction October 2023
New channel form post construction
New Ground Water Fed Wetland.
Pre project habitat photo.
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Catchment and 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, Grantham Blue Green - Urban Reach, Little Ponton, Manthorpe Floodplain Reconnection, Papermill Weir Section in-channel restoration, River Witham Great Ponton, Syston and Barkston Restoration, Upper Cringle Floodplain Restoration Project... further results


Site

Name Stainby Lane Colsterworth
WFD water body codes GB105030051570
WFD (national) typology
WFD water body name Witham - Headwaters to confluence of Cringle Brook
Pre-project morphology Meandering planform but with very poor connectivity and no gravel.
Reference morphology Lower Cringle Brook - Very well connected floodplain. Wood and gravel abundant.
Desired post project morphology Floodplain connectivity improved, gravel and wood added.
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 Ground Water Fed but quite responsive due to modifications.
Dominant substrate Pre project - Clay and fine silts.
River corridor land use Grazed - Cattle.
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) 13001,300 m <br />1.3 km <br />130,000 cm <br />
Project started
Works started
Works completed
Project completed
Total cost category 100 - 500 k€
Total cost (k€) 318318 k€ <br />318,000 € <br />
Benefit to cost ratio
Funding sources EA, Anglian Water

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design 1 - 10 k€ 3030 k€ <br />30,000 € <br /> East Mercia Rivers Trust Gail Talton
Stakeholder engagement and communication
Works and works supervision 100 - 500 k€ East Mercia Rivers Trust Gail Talton
Post-project management and maintenance
Monitoring East Mercia Rivers Trust Gail Talton



Reasons for river restoration

Mitigation of a pressure Land drainage
Hydromorphology
Biology Fish
Physico-chemical Phosphate
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Bank Lowering, gravel and wood added
Floodplain / River corridor Ground water fed wetlands
Planform / Channel pattern In-set floodplains created, bend widening, bank reprofiling.
Other
Non-structural measures
Management interventions Conservation grazing
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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