Case study:Colliers Row

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Location: 51° 35' 36.69" N, 0° 9' 14.39" E

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Project overview

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Status	Planned
Project web site
Themes	Habitat and biodiversity, Social benefits
Country	England
Main contact forename	Becca
Main contact surname	O’Shea
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.gov.uk/government/organisations/environment-agency
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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Small deflectors placed within the channel, which could help to encourage the creation of some pool riffle sequences within the channel. There is potential to re-profile some sections of the river bank along recreation ground, which would create shelves for aquatic planting. By re-profiling the banks it would be possible to reconnect the river to its floodplain. This stretch of the Rom possesses natural banks and bed, though in the past it seems to have been straightened, demonstrated by a uniform channel throughout. The river is overly straight where it runs between Carter Avenue and Turpin drive, but is beginning to restore itself in places. The natural gravel bed is evident. Where the river enters the recreation ground it is also straight lacking much geomorphological diversity, the banks are overly steep and uniform.

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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 Roding, Beam and Ingrebourne Subcatchment River name Rom / Beam (Including Bourne Brook, from Watton's Green to confluence with Ravensbourne) Area category 10 - 100 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) 107107 m <br />0.107 km <br />10,700 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Improved grassland Waterbody ID GB106037028120 Other case studies in this subcatchment: Chase Nature Reserve, King Georges Playing Field, Raphael Park, Roneo Corner Site Edit site Name WFD water body codes GB106037028120 WFD (national) typology WFD water body name Rom / Beam (Including Bourne Brook, from Watton's Green to confluence with Ravensbourne) 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 Edit project background Reach length directly affected (m) 900 m0.9 km <br />90,000 cm <br /> Project started 2010/01/01 Works started Works completed Project completed Total cost category Total cost (k€) 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 Hydromorphology Channel pattern/planform Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Bank reprofiling, Deflectors Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other 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 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 Supplementary Information Edit Supplementary Information