20 Case Studies in London
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EA2664 Enhance GLA 20 03.04.2003 4:42 pm Page 11 CASE STUDIES Enfield 1 Barnet Harrow Haringey Waltham Redbridge Forest 2 Havering 3 Brent Hackney Hillingdon Camden Islington 15 Barking and Newham Dagenham Kensington and Chelsea Hammersmith and Fulham Tower 16 18 Ealing Westminster City Hamlets 17 9 14 Southwark 10 Greenwich 4 19 20 Hounslow 11 5 Lambeth Bexley 12 Wandsworth Richmond Lewisham upon Thames 6 7 13 Merton Kingston upon Thames 8 Case study Development Type of enhancement Bromley Sutton Croydon type RAF Stanmore, • residential • river restoration 1 Stanmore • improving quality of life • sustainable flood defence 2 Brent Cross, Hendon • retail park • river restoration • improving quality of life Case study Development Type of enhancement • restoring land type • delivering biodiversity 12 Brookmill Park, • light railway • improving quality of life Tokyngton Park, • environmental • river restoration Lewisham system • river restoration 3 Tokyngton improvement • delivering biodiversity • sustainable flood defences • improving quality of life • delivering biodiversity 13 Worseley Bridge Road, • residential • improving quality of life 4 Brentford • mixed • sustainable flood defences Regeneration, • delivering biodiversity Bromley • river restoration Brentford • improving quality of life • sustainable flood defences • delivering biodiversity Wandsworth Riverside, • mixed • sustainable flood defences 5 Wandsworth • delivering biodiversity 14 Greenwich • residential, • restoring land • improving quality of life Peninsular,Greenwich leisure and • improving quality of life • restoring land commercial • sustainable flood defences • delivering biodiversity Wandle Park, Colliers • environmental • sustainable urban drainage 6 Leyton Relief Road, • road scheme • sustainable urban drainage Wood improvement • river restoration 15 • sustainable flood defences Leyton • restoring land • restoring land • sustainable flood defences • improving quality of life • delivering biodiversity Priory Park, • retail park • sustainable urban drainage Fresh Wharf Estate • industrial and • improving quality of life 7 16 Colliers Wood • improving quality of life and Hewett’s Quay, retail • sustainable flood defences • sustainable flood defence Barking • delivering biodiversity • delivering biodiversity Gallions Reach Urban • residential • sustainable urban drainage 17 Culvers Avenue, • residential • sustainable urban drainage Village, Thamesmead • restoring land 8 Carshalton • restoring land • improving quality of life • improving quality of life • river restoration • river restoration • sustainable flood defences • sustainable flood defence • delivering biodiversity • delivering biodiversity Channel Tunnel Rail • rail scheme • restoring land 18 Tate Modern, • art gallery • improving quality of life Link, Dagenham • river restoration 9 Southwark • sustainable flood defence • sustainable flood defence • delivering biodiversity Lockes Wharf, • residential • improving quality of life 10 BICC Cables, Erith • car park • sustainable urban drainage Isle of Dogs • sustainable flood defences 19 • delivering biodiversity • improving quality of life • delivering biodiversity Deptford Creek • mixed • sustainable urban drainage 11 Morrison Pier, Erith • mixed • improving quality of life Regeneration, • improving quality of life 20 Deptford • sustainable flood defences • sustainable flood defence • delivering biodiversity 11 EA2664 Enhance GLA 20 03.04.2003 4:43 pm Page 12 RAF Stanmore ypes of Enhancement LocationRAF Stanmore,Rivers /Edgware CatchmentNorthLondon West Brook BarnetLondon Borough/ BrentDeveloper catchmentLaing HomesDate StartedUnder Tconstruction/ CompletedImprovingRiver Quality RestorationSustainable ofDevelopment Life FloodResidential DefenceContact Type Customer detailsEnvironment Services,North Agency,EastApollo Area, StCourt, Albans Hatfield,2 Bishops Road Herts.West, Square, AL10 9EX. Site History Following the cut backs in the armed forces during the 1990’s this site became surplus to military requirements and is now being developed for housing. The RAF Realigned Edgware Brook site is crossed by the Edgware Brook near Proposed bund to retain flood to its source within storage the grounds of Bentley Priory, a designated Site of Special Scientific Edgware Brook – currently runs in culvert beneath site Interest (SSSI). Environment Agency Interests • surface water attenuation Temple pond • flood alleviation Line of existing culvert • river restoration • habitat creation Proposed route of the Edgware Brook Description of Scheme There are flooding problems associated with the upper The redevelopment of this site has provided the reaches of the Brent catchment and therefore it has been opportunity to de-culvert 70 metres of the Edgware Brook particularly important to manage surface water flows and which crosses the south west corner of the site. Extensive runoff as part of this scheme. Increasing the amount of consultation has been undertaken with local residents to impermeable area within the upper reaches of the help shape the final site design and as a result the newly catchment could have a dramatic impact on flooding opened watercourse will link to Temple Pond, an existing downstream. The Agency is implementing a flood feature within the site adjacent to the route of the Brook. alleviation scheme The newly opened channel will be restored to a more for this catchment natural state with appropriate planting and re-profiling of which will utilise the banks. areas of open A buffer zone will surround the de-culverted Brook and green space, such in order to provide additional flood storage to benefit the as parks, to act as wider Brent catchment, an earth bund and storage pond flood storage will be incorporated adjacent to the watercourse. areas. Prior to the demolition of the site there had been localised flooding resulting from water overflowing from Temple Pond. Residents were concerned, so the RAF undertook to repair the existing weir structure that controls water levels within the pond. This responsibility has now been passed to the developer who has undertaken to repair the control structure within the pond and raise the banks of the pond to increase flood storage levels. Temple Pond – overflow weir EA2664 Enhance GLA 20 03.04.2003 4:43 pm Page 13 Brent Cross ypes of Enhancement LocationHendon,Rivers North /River CatchmentWest BrentLondon London / BrentBrent Borough catchmentandDeveloper EalingHammersonDate StartedPropertiesPre construction permission/ CompletedT – planningRestoringImproving LandRiver Quality RestorationDelivering ofDevelopment Life Biodiversity Shoppingbusiness Type centreContact park extensionCustomer details andEnvironment Services,North Agency,EastApollo Area, StCourt, Albans Hatfield,2 Bishops Road Herts.West, Square, AL10 9EX. Site History edges. The banks on the northern side will grade up from Located at the junction of the A406 and the M1, the Brent the footpath and are designed to form the adjacent flood Cross centre has been a focus for shopping in the north channel at times of high flows in the river. On both sides of London area for a number of years. Current constraints the river, a continuous strip will be provided along the upon car parking and the demand for new facilities have footpath, to allow the migration of animals along the dry meant that the owners of the site are looking to expand margins of the river corridor. Wherever possible, softer their current facilities. This has provided an opportunity to forms of bank protection will be used, such as timber realise a number of environmental enhancements along the edging. At several locations, reed beds are to be River Brent that flows adjacent to the site. incorporated which will soften the edges of the bank, and also provide marginal vegetation for additional habitats. A Environment Agency Interests café is planned incorporating a wide terrace down to the • river diversion and enhancement river. Disabled access will be provided along the footpath • improved public access with several ramps at strategic points being integrated • improve visual amenity of river corridor within the channel diversion. Description of Scheme Originally much of the Brent Cross site was a shallow part of the Brent Reservoir and the River Brent ran further to the south than its present course. In the late 1930’s, this part of the reservoir was filled in for the construction of the North Circular Road and the river diverted along its present course. Due to concerns about flooding, the river was straightened within an oversized concrete channel in order that flood flows could be accommodated within the channel. The proposed diversion of the river presents a number River Brent – existing channel of challenges, including flood management, the possible The whole area has been identified within Brent Unitary threat of contamination, and the opportunity of an Development Plan as an area for future development and is improved river corridor. The river diversion has been linked closely to the redevelopment of the Cricklewood planned as a ‘two stage’ channel, to allow for times of both lands, an area that adjoins the North Circular to its low an high flow, and to provide a number of southern side. improvements to the river corridor. The increased sinuosity Multi use public space of the new channel, made possible by its diversion to Landscaped area the south, will naturalise the new river corridor. A new Riffle weir will help to retain a greater depth of water and the riffles will assist in