Case study:River Pool Linear Park Enhacement

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Location: 51° 26' 0.81" N, 0° 1' 42.12" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity
Country	England
Main contact forename	Nick
Main contact surname	Elbourne
Main contact user ID
Contact organisation	River Restoration Centre
Contact organisation web site	http://www.therrc.co.uk
Partner organisations	Thames21
Parent multi-site project
This is a parent project encompassing the following projects	No

River Pool mid-restoration, April 2012

Project summary

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This section of the River Pool was featureless with very little marginal vegetation. The channel was overshadowed and habitat for fish and invertebrates was limited. In a built up borough of London, the river is flashy and the aim was to design works that would account for this, while improving the in-stream condition and the wider river corridor. This was achieved through the creation of berms on alternating banks, created using wood felled on-site. The berms were positioned in a manner to encourage the creation of pool and riffle sequences to further diversify flow conditions.

The works were built entirely by volunteers, organised through the Thames21 project. The empowerment of local volunteers fosters understanding, and long-term, there is a greater aspiration to re-visit and maintain the works. Additionally, the use of volunteers and on-site materials kept costs very low, with the whole project costing in the region of £500 (€625).

series of berms on alternating banks along a section of 300m constructed from site-won wood felled along this section

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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(affects all case studies in this subcatchment)

Catchment

River basin district	Thames
River basin	Roding, Beam and Ingrebourne

Subcatchment

River name	Ravensbourne
Area category	10 - 100 km²
Area (km2)
Maximum altitude category	Less than 100 m
Maximum altitude (m)	8888 m <br />0.088 km <br />8,800 cm <br />
Dominant geology	Calcareous
Ecoregion	Great Britain
Dominant land cover	Suburban
Waterbody ID	GB106037028110

Other case studies in this subcatchment: ERCIP - European River Corridor Improvement Plans, The River Ravensbourne (submission for UK Rivers Prize 2016

Site

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Name	River Pool
WFD water body codes	GB106039023250
WFD (national) typology
WFD water body name	Pool River
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

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Reach length directly affected (m)	300 m0.3 km <br />30,000 cm <br />
Project started	2011/11/01
Works started
Works completed
Project completed	2012/05/31
Total cost category	Less than 1 k€
Total cost (k€)	0.6 k€600 € <br />
Benefit to cost ratio
Funding sources

Cost for project phases

Phase	cost category	cost exact (k€)	Lead organisation	Contact forename	Contact surname
Investigation and design
Stakeholder engagement and communication	Less than 1 k€	00 k€ <br />0 € <br />	Thames21
Works and works supervision	Less than 1 k€	00 k€ <br />0 € <br />	Thames21
Post-project management and maintenance
Monitoring

Supplementary funding information

A very low cost project thanks to:
- The Environment Agency provided the spoil used in the project from a nearby site (free of charge).
- Free voluntary labour
- Site-sourced tree material

Reasons for river restoration

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Mitigation of a pressure
Hydromorphology	Quantity & dynamics of flow
Biology	Fish: Abundance
Physico-chemical
Other reasons for the project	Improving a local park

Measures

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Structural measures
Bank/bed modifications	Creation of berms
Floodplain / River corridor
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other	Participation in works, Participation in maintenance

Monitoring

Hydromorphological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Biological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
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Physico-chemical quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
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Any other monitoring, e.g. social, economic

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Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Monitoring documents

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Image gallery

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The restored river, complete with berms. April 2012

Use of willow to create berm. April 2012

Group of Thames21 volunteers in action. April 2012

Volunteer creating one of the berms. April 2012

Created berm, filled with spoil. April 2012

Additional documents and videos

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Additional links and references

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Link	Description
http://www.therrc.co.uk/case studies/river%20pool%20case%20study.pdf	River Restoration Centre Case Study

Supplementary Information

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Thames21 website for more information on their work: www.thames21.org.uk