Case study:Drayton

0.00

(0 votes)

To discuss or comment on this case study, please use the discussion page.

Location: 52° 30' 55.05" N, 0° 47' 13.34" W

Edit location

Loading map...

{"format":"googlemaps3","type":"HYBRID","minzoom":false,"maxzoom":false,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"limit":50,"offset":0,"link":"all","sort":[""],"order":[],"headers":"show","mainlabel":"","intro":"","outro":"","searchlabel":"... further results","default":"","import-annotation":false,"width":"auto","height":"400px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"visitedicon":"","wmsoverlay":false,"zoom":14,"layers":[],"controls":["pan","zoom","type","scale","streetview","rotate"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"resizable":false,"kmlrezoom":false,"poi":true,"cluster":false,"clustergridsize":60,"clustermaxzoom":20,"clusterzoomonclick":true,"clusteraveragecenter":true,"clusterminsize":2,"imageoverlays":[],"kml":[],"gkml":[""],"searchmarkers":"","fullscreen":false,"scrollwheelzoom":false,"showtitle":false,"hidenamespace":true,"template":"Location map popup","userparam":"","activeicon":"","pagelabel":false,"ajaxcoordproperty":"","ajaxquery":"","locations":[{"text":"\u003Cp\u003E\u003Cbr /\u003E\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EProject Title:\u003C/b\u003E Drayton\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003ECountry:\u003C/b\u003E \u003Ca href=\"/wiki/index.php?title=England\" title=\"England\"\u003EEngland\u003C/a\u003E\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EProject Status:\u003C/b\u003E Complete\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EThemes:\u003C/b\u003E Habitat and biodiversity\n\u003C/p\u003E\u003Cp\u003E\u003Cbr /\u003E\n\u003C/p\u003E","title":"Drayton","link":"","lat":52.515291694211,"lon":-0.78703821823729,"icon":"/wiki/images/a/af/Red_marker.png"}]}

Left click to look around in the map, and use the wheel of your mouse to zoom in and out.

Project overview

Edit project overview

Status	Complete
Project web site
Themes	Habitat and biodiversity
Country	England
Main contact forename	Environment Agency Customer Contact
Main contact surname	Anglian Northern Area
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.environment-agency.gov.uk
Partner organisations	Welland Rivers Trust, Wild Trout Trust
Parent multi-site project
This is a parent project encompassing the following projects	No

location map

Project summary

Edit project overview to modify the project summary.

The scheme was implemented by the Environment Agency with the co-operation and agreement of the adjacent landowners (Matthew and Melanie Robinson and Alister Brooke-Clarke) and in-kind support from the Welland Rivers Trust and the Wild Trout Trust.

Summary of Techniques: Faggot, woody debris and coir roll flow deflectors; channel pinching using faggots, woody debris and coir rolls; introduction of gravels to augment and create riffles; bank toe protection using rock and coir; new cattle drinkers; riverside fencing; selected tree works including crown-lifting and pollarding; new tree and shrub planting; artificial otter holt construction.

Background During the 1970s the River Welland was significantly modified. The natural river morphology was altered to improve land drainage and flood water discharge. The river was deepened; many meanders, pools, riffles and glides were removed; and the river was constricted within high, straight banks. High winter flood flows and poor land management practices now cause significant bank erosion and sedimentation. Prior to modification a high proportion of these nutrient-rich sediments would have been deposited on the floodplain, providing rich grazing pasture, but, as a result of the flood defence works, a large proportion of these sediments now remain in the channel, degrading habitats including fish spawning gravels.

Monitoring surveys and results

This case study hasn’t got any Monitoring survey and results, you can add some by editing the project overview.

Lessons learnt

This case study hasn’t got any lessons learnt, you can add some by editing the project overview.

Catchment and subcatchment

Select a catchment/subcatchment

Edit the catchment and subcatchment details
(affects all case studies in this subcatchment)

Site

Edit site

Name	River Welland downstream of Ashley gauging station
WFD water body codes	GB105031050580
WFD (national) typology	Calcareous
WFD water body name	Welland
Pre-project morphology	Straightened, Over deepened, Low gradient passively meandering, Pool-riffle, Run-glide
Reference morphology
Desired post project morphology
Heavily modified water body	Yes
National/international site designation	EU - WFD protected area (drinking water, shellfish etc.)
Local/regional site designations
Protected species present	Yes
Invasive species present	No
Species of interest	otter; brown trout
Dominant hydrology
Dominant substrate	Gravel
River corridor land use	Improved/semi-improved grassland/pasture
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)	17001,700 m <br />1.7 km <br />170,000 cm <br />
Project started
Works started	2011/09/01
Works completed
Project completed	2011/12/01
Total cost category	50 - 100 k€
Total cost (k€)	7070 k€ <br />70,000 € <br />
Benefit to cost ratio
Funding sources	Environment Agency

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 management, Land drainage
Hydromorphology	Continuity of sediment transport
Biology	Fish
Physico-chemical	Nutrient concentrations
Other reasons for the project

Measures

Edit Measures

Structural measures
Bank/bed modifications	Creation of deflectors, Bank stabilisation, Introducing gravel, cattle drinkers
Floodplain / River corridor	Tree planting, tree management
Planform / Channel pattern	Channel narrowing
Other
Non-structural measures
Management interventions	Fencing
Social measures (incl. engagement)
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
Substrate conditions	No	No	No	No	No

Biological quality elements

Edit biological
quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative
Fish	Yes	No	No	No	No
Invertebrates	Yes	No	No	No	No

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

Image gallery

Edit Image gallery

Additional documents and videos

Upload additional documents

Drayton case study

Additional links and references

Edit links and references

Link	Description
http://www.ecologylink.com	Ecology Link Ltd - Ecological survey and scheme design
http://www.water-lines.co.uk	Water-Lines Solutions - supplied the coir rolls

Supplementary Information

Edit Supplementary Information