Case study:Holmsley Inclosure Stream Restoration

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Location: 50° 48' 0", -1° 41' 5"
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Project overview

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Status Complete
Project web site
Themes Environmental flows and water resources, Habitat and biodiversity, Hydromorphology, Monitoring
Country England
Main contact forename Bryan
Main contact surname Boult
Main contact user ID
Contact organisation Hampshire County Council
Contact organisation web site http://www.hants.gov.uk/
Partner organisations English Nature, Environment Agency, Forestry Commission, National Trust, RSPB
Parent multi-site project

Case_study:New Forest LIFE project

This is a parent project
encompassing the following
projects
No
File:Holmsley Enclosure Stream.jpg
Bed level raising in progress

Project summary

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This site is a part of New Forest LIFE project. The bed levels were raised for approximately 500m of the existing Stony Moors stream between the enclosure boundary and the fords on the public road. Levels were raised to within 0.4m of the surrounding floodplain to restore winter flooding on the flood plain. This was achieved using clay plugs and backfilling with imported hoggin and available bank spoil. Due to the steep gradient additional support was given to the infill in the form of log weirs, oak boards and live willow. Alongside the river bed restoration 8.8 hectares of scrub management and vegetation clearance was made.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

Catchment

River basin district South East
River basin New Forest

Subcatchment

River name Avon Water
Area category 10 - 100 km²
Area (km2)
Maximum altitude category Less than 100 m
Maximum altitude (m) 82
82 m
0.082 km
8,200 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Improved grassland
Waterbody ID GB107042011300



Other case studies in this subcatchment: Avon Barriers Project, Avon Barriers Project: Ferengair Weir, HLS New Forest


Site

Name Holmsley Inclosure Stream
WFD water body codes GB107042011300
WFD (national) typology
WFD water body name Avon Water
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

Reach length directly affected (m)
Project started 2002/07/01
Works started
Works completed
Project completed 2006/12/31
Total cost category 50 - 100 k€
Total cost (k€)
Benefit to cost ratio
Funding sources EU LIFE Programme

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 Width & depth variation
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Bed raising, Tree management
Floodplain / River corridor
Planform / Channel pattern
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
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

Link Description
http://ec.europa.eu/environment/life/project/Projects/index.cfm?fuseaction=home.showFile&rep=file&fil=LIFE02 NAT UK 008544 AfterLIFE.pdf After LIFE conservation plan
http://www.newforestlife.org.uk/life3/life3index.htm New Forest LIFE 3 web page
http://ec.europa.eu/environment/life/project/Projects/index.cfm?fuseaction=home.createPage&s ref=LIFE02%20NAT/UK/008544&area=1&yr=2002&n proj id=1976&cfid=423407&cftoken=1adf75e7742a0a31-858CC2AB-CCBA-042D-07FCA090D1A64E01&mode=print&menu=false New Forest on EU LIFE programme

Supplementary Information

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