Case study:Norman Park Bromley.

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Location: 51° 23' 18.29" N, 0° 1' 35.01" E

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Project overview

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Status	Complete
Project web site
Themes	Flood risk management, Habitat and biodiversity, Social benefits, Urban
Country	England
Main contact forename	Dave
Main contact surname	Webb
Main contact user ID	User:Djwebb
Contact organisation	Environment Agency
Contact organisation web site
Partner organisations	London Borough of Bromley
Parent multi-site project
This is a parent project encompassing the following projects	No

Deculverting

Project summary

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The Ravensbourne is a spring-fed stream flowing from its source near Keston, on the north slope of the North Downs, northwards through Bromley, Catford and Lewisham to join the Thames at Deptford Creek. In many areas such as Norman Park the stream is confined within a culvert. Culverting of small watercourses in urban and parkland areas has been common in the recent past. Burying the river was felt to reduce the flooding potential, minimise safety issues associated with open water and maximise land available for development or use as open space/playing fields. Little consideration was given to habitat loss, aesthetic and landscape appeal of rivers or the potential benefits of surface water storage. The Ravensbourne flows for 300m through a 1m diameter concrete-lined steel culvert. Smaller land drains, which had been ditches before the area was levelled to form the park, flow into the culvert at intervals along its length. The culvert is crossed close to both its northern and southern ends by park access tracks and major services, with a gas pipeline and electric supply cables crossing the culvert at the north end and a water pipe and local electrical supply cables at the southern end. Deculverting (daylighting) the Ravensbourne would help to restore the corridor by recreating an open channel (in replacement of the culverted section) with diverse in-channel and bankside habitats linking to Scrogginhall Woods just upstream of the park.

Monitoring surveys and results

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River Corridor Survey.

Lessons learnt

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The park users, particularly dog walkers, now see the open Ravensbourne as a focal point, circling the area and making use of the crossing points. Children and dogs play along the banks even though the site has still to mature.

The marginal planting is suffering disturbance from dogs and children and may take longer than expected to establish a good cover, though this may eventually produce a good diversity of edge habitats. The wildflower plugs have been decimated by crows in search of worms. About a third were removed from the ground and became desiccated.

The planting scheme was designed as a balance between creating an instance impact for the local users and allowing natural processes of colonisation to occur. Even so the local users have stated that they would have expected more immediate impact from the planting. The success of the project can be attributed to the multi-disciplinary project team and the Partnership between the Borough Council and the Environment Agency.

Image gallery

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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 London Subcatchment River name Ravensbourne (Keston to Catford) Area category 10 - 100 km² Area (km2) Maximum altitude category 200 - 500 m Maximum altitude (m) 274274 m <br />0.274 km <br />27,400 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Suburban Waterbody ID GB106039023260 Other case studies in this subcatchment: Downham Playing Fields, Fordmill weir, Ravensbourne at Queensmead Site Edit site Name WFD water body codes GB106039023260 WFD (national) typology WFD water body name Ravensbourne (Keston to Catford) 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) Project started 2000/03/01 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 culvert, Flood risk management Hydromorphology culvert Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Floodplain reconnection, Increase water retention area Planform / Channel pattern Deculverting, Increase in-channel hydromorphological diversity 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