Case study:Blackwater River Habitat Enhancements & Fish Passage

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Location: 51° 22' 33", -0° 57' 4"
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Project overview

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Status In progress
Project web site http://acountrychap.wordpress.com/
Themes Environmental flows and water resources, Fisheries, Flood risk management, Habitat and biodiversity, Land use management - agriculture, Water quality
Country England
Main contact forename Matt
Main contact surname Drew
Main contact user ID User:ACountryChap
Contact organisation ACountryChap
Contact organisation web site http://acountrychap.wordpress.com/
Partner organisations
Parent multi-site project
This is a parent project
encompassing the following
projects
No
Newly created high/low flow channel with graded banks & woody debris.

Project summary

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To improve habitat, fish passage, spawning and recruitment opportunities, native fish stocks and implement Water Framework Directive improvements to achieve Good Ecological Status within the catchment. Also, to decrease any risk of the property flooding, improve the ecology, repair the damage from historic dredging and land use of the grounds and create sympathetic use of the pasture land.

- Introduction of naturally occurring LWD to encourage flow diversity and increase channel sinuosity

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

Catchment

River basin district Thames
River basin Loddon

Subcatchment

River name Blackwater (Bramshill to River Loddon confluence at Swallowfield)
Area category 100 - 1000 km²
Area (km2)
Maximum altitude category Less than 100 m
Maximum altitude (m) 100
100 m
0.1 km
10,000 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Arable and Horticulture
Waterbody ID GB106039017320



Other case studies in this subcatchment: Blackwater River Habitat Enhancements & Fish Passage


Site

Name Wolsey Cottage, Church Road, Swallowfield, Berkshire
WFD water body codes GB106039017320
WFD (national) typology
WFD water body name Blackwater (Bramshill to River Loddon confluence at Swallowfield)
Pre-project morphology Naturally straight, Reinforced banks, Straightened, Single channel, Artificial channel
Reference morphology
Desired post project morphology 2-stage channel, Low gradient passively meandering, Pool-riffle
Heavily modified water body No
National/international site designation
Local/regional site designations
Protected species present No
Invasive species present Yes
Species of interest American mink (Mustela vison ), American signal crayfish (Pacifastacus leniusculus), Himalayan balsam (Impatiens glandulifera )
Dominant hydrology Groundwater, Quick run-off, Artificially regulated
Dominant substrate Gravel
River corridor land use Improved/semi-improved grassland/pasture
Average bankfull channel width category 2 - 5 m
Average bankfull channel width (m)
Average bankfull channel depth category 0.5 - 2 m
Average bankfull channel depth (m)
Mean discharge category 1 - 10 m³/s
Mean annual discharge (m3/s)
Average channel gradient category 0.001 - 0.01
Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m) 850
850 m
0.85 km
85,000 cm
Project started 2014/11/12
Works started 2015/03/14
Works completed
Project completed
Total cost category 1 - 10 k€
Total cost (k€)
Benefit to cost ratio
Funding sources Landowner

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design Less than 1 k€ ACountryChap Matt Drew
Stakeholder engagement and communication Less than 1 k€ ACountryChap Matt Drew
Works and works supervision 1 - 10 k€ ACountryChap Matt Drew
Post-project management and maintenance 1 - 10 k€ ACountryChap Matt Drew
Monitoring



Reasons for river restoration

Mitigation of a pressure Land drainage, Flood risk management, Flood protection maintenance works, Barriers to fish migration
Hydromorphology Freshwater flow regime, Quantity & dynamics of flow
Biology Fish: Abundance, Fish: Age structure, Invertebrates, Invertebrates: Abundance, Invertebrates: Diversity, Macrophytes
Physico-chemical
Other reasons for the project Bank erosion, Landscape enhancement, Recreation, improve fishing, reduce flood risk


Measures

Structural measures
Bank/bed modifications Adding sinuosity, Alteration in channel dimensions, Bank reprofiling, Bank improvement, Bank stabilisation, Cleaning of spawning gravels, Construction of gravel banks, Creation of fish spawn nursing places, Creation of shoals/berms, Decrease sedimentation, Cut back of trees, Deflectors, Depth variation, Developing angling infrastructure, Diversification of in-channel features, Erosion Repair, Fenced off riverbank, Fencing, Fish habitat restoration, Gravel augmentation, Improvement of natural flows, Installation of bioengineering elements, Introducing large woody debris, Introduction of gravel, Livestock fencing, Introduction of spawning gravels, Lowering of embankments, Riparian planting, New bioengineering elements in order to stabilize slope banks, Placement of faggots, Removal of invasive plants, Tree management, Weir modification, high banks were “pushed” into the channel to create a low flow channel with natural bank profiles that support a range of emergent and marginal habitats., Removal of invasive species, Deculverting, Bed reprofiling, Habitat diversification, Large woody derbis dams, Creation of pools, Creation of berms, Creation of low flow channel, Opening of cut-off meanders, Riffle creation, Restoring gravel bed, Meandering channel, Creation of fish passes, Eel pass, Removal of fish barriers, Creation of fish passes
Floodplain / River corridor Adding sinuosity, Creation of fish refuge areas, Creation of fish spawn nursing places, Creation of shoals/berms, Decrease sedimentation, Cut back of trees, Deflectors, Depth variation, Developing angling infrastructure, Diversification of in-channel features, Erosion Repair, Fenced off riverbank, Fencing, Fish habitat restoration, Gravel augmentation, Improvement of natural flows, Installation of bioengineering elements, Introducing large woody debris, Introduction of gravel, Livestock fencing, Introduction of spawning gravels, Lowering of embankments, Riparian planting, New bioengineering elements in order to stabilize slope banks, Placement of faggots, Removal of invasive plants, Tree management, Weir modification, high banks were “pushed” into the channel to create a low flow channel with natural bank profiles that support a range of emergent and marginal habitats, Improving fish migration, Deculverting, Create riffle/pool, Vegetation removal
Planform / Channel pattern Adding sinuosity, Bank reprofiling, Bank improvement, Bank stabilisation, Cleaning of spawning gravels, Construction of gravel banks, Creation of fish refuge areas, Creation of fish spawn nursing places, Creation of pools and riffles, Creation of shoals/berms, Decrease sedimentation, Cut back of trees, Flow deflectors, Depth variation, Developing angling infrastructure, Diversification of in-channel features, Erosion Repair, Fenced off riverbank, Fencing, Fish habitat restoration, Gravel augmentation, Improvement of natural flows, Installation of bioengineering elements, large, Introducing large woody debris, Introduction of gravel, Livestock fencing, Introduction of spawning gravels, Lowering of embankments, Riparian planting, New bioengineering elements in order to stabilize slope banks, Placement of faggots, Removal of invasive plants, Tree management, Weir modification, high banks were “pushed” into the channel to create a low flow channel with natural bank profiles that support a range of emergent and marginal habitats, Improving fish migration, Actively meandering, Deculverting
Other Adding sinuosity, Alteration in channel dimensions, Bank reprofiling, Bank improvement, Bank stabilisation, Cleaning of spawning gravels, Construction of gravel banks, Creation of fish refuge areas, Creation of fish spawn nursing places, Creation of pools and riffles, Creation of shoals/berms, Decrease sedimentation, Cut back of trees, Deflectors, Depth variation, Developing angling infrastructure, Diversification of in-channel features, Erosion Repair, Fenced off riverbank, Fencing, Fish habitat restoration, Gravel augmentation, Improvement of natural flows, Installation of bioengineering elements, Introducing large woody debris, Introduction of gravel, Livestock fencing, Introduction of spawning gravels, Lowering of embankments, Riparian planting, New bioengineering elements in order to stabilize slope banks, Placement of faggots, Removal of invasive plants, Tree management, Weir modification, high banks were “pushed” into the channel to create a low flow channel with natural bank profiles that support a range of emergent and marginal habitats, Improving fish migration, Deculverting
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other


Monitoring

Hydromorphological quality elements

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Before measures After measures Qualitative Quantitative

Biological quality elements

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Physico-chemical quality elements

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Any other monitoring, e.g. social, economic

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Monitoring documents



Additional documents and videos


Additional links and references

Link Description
http://acountrychap.wordpress.com Blog on the river and associated habitat works
http://twitter.com/ACountryChap Twitter Feed

Supplementary Information

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