Case study:Martins River Island

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Location: 50° 42' 53", -2° 21' 20"
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Project overview

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Status Complete
Project web site
Themes Environmental flows and water resources, Fisheries, Habitat and biodiversity, Hydromorphology
Country England
Main contact forename Aly
Main contact surname Maxwell
Main contact user ID User:Alymaxwell
Contact organisation Environment Agency
Contact organisation web site
Partner organisations
Parent multi-site project

Case_study:River Frome Rehabilitation Plan

This is a parent project
encompassing the following
projects
No
Project picture

Project summary

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The reach at Ilsington upstream of Nine Hatches on the River Frome has been significantly degraded through dredging and embankment creation through previous land drainage schemes over the past 40 years. In 2009 the Woodsford Channel project improved the reach immediately upstream of Nine Hatches; this project relooked at this reach and an additional 700 metres upstream. The key aspects of the Martins River Island project were to: a) remove the raised embankments (to improve river and floodplain connection. b) to introduce new gravels to replace the historically dredged gravels (providing new spawning habitat), c) introduce large woody debris to the reach d) create new wetland habitats d) new riparian tree planting.

Monitoring surveys and results

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Pre works electro fishing was undertaken at this site. Post works was carried oout in 2013. Repeat survey is not likley until 2016

Lessons learnt

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When adding gravels to the river bed to previously dredged sectiosn be aware ofg the imapct this may have on flood connection during higher flows. Follwing the addition of gravel the two following winters have experienced very high flwos whith significant prolonged out of bank flows for severals months each winter. In this case thelandowner was ok with this but in other projects this may have become a significant issue.


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Catchment and subcatchment

Catchment

River basin district South West
River basin Dorset

Subcatchment

River name Frome Dorset (Lower) & Furzebrook Stream
Area category 100 - 1000 km²
Area (km2)
Maximum altitude category 200 - 500 m
Maximum altitude (m) 223
223 m
0.223 km
22,300 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Arable and Horticulture
Waterbody ID GB108044009690



Other case studies in this subcatchment: 2e Lower Woodsford River and Floodplain Enhancement, Bockhampton Enhancement, Hurst Bridge (downstream), Louds Mill (Downstream)m Enhancement, Lower Bockhampton, Lower Woodsford, Moreton Channel Gravel Reprofiling, North Channel Upper Reach, River Frome Rehabilitation Plan, Unit 1b - Long Bridge to Downstream of Louds Mill... further results


Site

Name
WFD water body codes GB108044009690
WFD (national) typology
WFD water body name Frome Dorset (Lower) & Furzebrook Stream
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
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Average bankfull channel depth (m)
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Mean annual discharge (m3/s)
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Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m)
Project started
Works started
Works completed
Project completed 2009/01/01
Total cost category
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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

Mitigation of a pressure
Hydromorphology reconnect the river floodplain
Biology provide spawning habitats
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications
Floodplain / River corridor Creation of wetland, Removal of embankments, Riparian planting
Planform / Channel pattern Introducing large woody debris, Introduction of gravel
Other
Non-structural measures
Management interventions
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
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Physico-chemical quality elements

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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



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Additional links and references

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Supplementary Information

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