Case study:Meades water garden regeneration project

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Location: 51° 42' 6.07" N, 0° 36' 41.97" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Monitoring, Water quality
Country	England
Main contact forename	Allen
Main contact surname	Beechey
Main contact user ID
Contact organisation	Chilterns Conservation Board
Contact organisation web site	http://http://www.chilternsaonb.org/conservation-board.html
Partner organisations	Chiltern Chalk Streams Project
Parent multi-site project
This is a parent project encompassing the following projects	No

Looking upstream at the restored river

Project summary

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Two weirs were removed and the site allowed to drain. A temporary dam was built at the top of the site and river flow was piped around the working area. Working from the upstream end, a new channel was dug through the accumulated silt following the line of preferential flow. Nicospan was installed to provide support to the new channel sides and to ensure separation of the silt from the gravel infill, which was imported to form the new river bed. It was important to allow at least 500mm of gravel to provide the depth that chalkstream invertebrates require for their life stage. Excavated silt was distributed around the site within the boundary of old ponds. The new channel was tied into the original course of the river which flowed around the back of the island in the lower pond. A low-lying bund was installed in place of the weir to create a wetland feature. Following completion of the river restoration work, new paths were laid in the gardens and an interpretation board installed.

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Lessons learnt

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Image gallery

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Downstream of the bridge during construction (top) and post-restoration (below)

Upstream of the bridge, during construction (top) and post-restoration (below)

Established wildlife upstream

Downstream of the bridge prior to project

Upstream of bridge prior to project

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Thames River basin Colne Subcatchment River name Chess Area category 10 - 100 km² Area (km2) Maximum altitude category 200 - 500 m Maximum altitude (m) 278278 m <br />0.278 km <br />27,800 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Improved grassland Waterbody ID GB106039029870 Site Edit site Name Meades Water Garden WFD water body codes GB106039029870 WFD (national) typology WFD water body name Chess Pre-project morphology Single channel, Straight, High width:depth Reference morphology Single channel, Sinuous, Step-pool, Pool-riffle Desired post project morphology Heavily modified water body Yes National/international site designation UK - Areas of Outstanding Natural Beauty Local/regional site designations Protected species present No Invasive species present No Species of interest Dominant hydrology Groundwater Dominant substrate Bedrock, Gravel River corridor land use Urban Average bankfull channel width category 5 - 10 m Average bankfull channel width (m) Average bankfull channel depth category 0.5 - 2 m 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) 120 m0.12 km <br />12,000 cm <br /> Project started 2007/01/01 Works started Works completed 2008/01/01 Project completed Total cost category 50 - 100 k€ Total cost (k€) 78 k€78,000 € <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 Works and works supervision Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Reservoir impoundment Hydromorphology Quantity & dynamics of flow, Flow velocities Biology Macrophytes, Invertebrates Physico-chemical Other reasons for the project Habitat enhancement Measures Edit Measures Structural measures Bank/bed modifications Planting, Introduction of gravel, Weir removal Floodplain / River corridor Removal of diseased vegetation, Creation of wetland Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other Public consultation, Information provision Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Macrophytes Yes Yes Yes Improvement Invertebrates Yes Yes Improvement 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 Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description http://www.therrc.co.uk/case studies/meades%20water%20garden.pdf River Restoration Centre Case Study Supplementary Information Edit Supplementary Information