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96Wembley Area Action Plan - Proposed Submission Version10 Response to climate changeClimate Change AdaptationGreening Wembley10.10 Brent Council seeks to increase theamount of surface area greened in the area and1,000 new trees are expected to be planted by2026. The roofs of existing buildings are mostlyunderused. Policy 5.10 of the London Planencourages the use of planting, green roofs andwalls and soft landscaping that can mitigate theeffects of climate change, such as the urban heatisland while bringing in health and social benefits.Green roofs also support sustainable urbandrainage by absorbing rainfall to reduce flooding,enhance biodiversity, provide amenity space,provide opportunities to grow food and improveappearance. Encouraging green infrastructurethrough redevelopment will help to improve theecological connectivity between sites for the benefitof local wildlife.WEM 34Urban GreeningDevelopment proposals must incorporateurban greening measures such as green roofs,green walls, trees and soft landscaping.Wherever possible, opportunities to connectnew green spaces to existing green spacesshould be maximized to help create greeninfrastructure. Where site constraints limit thelevel of urban greening that can be providedon site, a financial contribution will berequired. Local food growing facilities will besupported as stated in (see policy WEM 38 inthe Open Space chapter).FloodingPicture 10.1 Living wall & planted balconies10.11 There are two main types of floods in thearea, one is associated with the river when theactual amount of river flow is larger than the amountthat the channel can hold, and river will overflowits banks and flood the areas alongside the river.Land adjacent to the Wealdstone Brook is the areaat risk of flooding. Map 10.1 shows the areas atrisk of flooding. Brent seeks to ensure that all newdevelopment in flood risk areas is appropriatelyflood resilient and resistant and that any residualrisk can be safely managed.10.12 As required by the National PlanningFramework, the council has undertaken asequential approach should be used in areas knownto be for sites at risk from any form of floodingincluding fluvial and surface water flooding.Planning recommendations are provided for sitesat risk of flooding in the Site Proposalschapters. Inappropriate The council has a proactiveapproach to risk reduction when considering thesuitability of sites for future development in theWembley Area Action Plan, in line with therecommendations of the Strategic Flood RiskAssessment (SFRA). New development in areasat risk of flooding will be required to apply asite-level sequential test to ensure should beavoided by directing development is steered awayfrom areas at highest risk and located in line withthe NPPF flood risk vulnerability classificationbutwhere development is necessary, making it safewithout increasing flood risk elsewhere.10.13 In most of the urban area, roads and landare usually impermeable which can lead to surfacewater flooding. Much of Wembley is prone tosurface water flooding.The Flood and WaterManagement Act 2010 requires local authorities
Wembley Area Action Plan - Proposed Submission Version97Response to climate change 10across England and Wales to develop, maintain,apply and monitor a Brent’s Surface WaterManagement Plan (SWMP) provides a strategy forlocal flood risk management in the borough.theirareas. Brent Surface Water Management Plan(BSWMP),which contains the Preliminary FloodRisk Assessment and a Flood Risk ManagementPlan,The document identifies and designates aCritical Drainage Area (CDA) for the WembleyStadium area which has several areas of surfacewater flooding affecting property and criticalinfrastructure. Three WAAP sites fall into a LocalFlood Risk Zone (LFRZ). aims to help manage andreduce surface water flood risk in Brent.10.14 The Act also introduces the requirementsfor d Developers are required to constructinclude sustainable urban drainage systems(SUDS) in their schemes. The SWMP identifiesspecific SUDS measures for the Wembley StadiumCDA to relieve pressures on the drainage system,reduce flood risk and the demand for fresh water.These include rainwater harvesting and grey waterrecycling, canhelprelieve pressures on the drainagesystem, It canreduce flood risk and the demand forfresh water. SUDS such as green roofs, filter stripsand swales, storm water storage tanks, permeableand porous pavements, re-profiling of ground levels,basins, ponds, reed beds can help reduce thevolume and speed of water flowing into drains andeliminate surface water flooding. BSWMP favoursthe application of SUDS. Measures to alleviatesurface water flooding through SUDS will berequired as part of the development of sitesW3-W4, W6-W20 and W25-W29. Specific SUDSrequirements for sites in the LFRZ are set out inthe appropriate Site Proposals.Picture 10.2 Sustainable urban drainage scheme10.15 In addition, Most of the sewer network inthe Wembley area is undersized. Carefulconsideration must be given to issues of sewerflooding, both on and off site, as a result of newdevelopment. Developers may be required to carryout studies to ascertain whether proposeddevelopment will lead to overloading of the existingsewer infrastructure.10.16 Specific flood risk reduction measures andFlood Risk Assessment requirements are set outfor each site proposal (chapters 12-16). Thisincludes recommendations from the SFRA, SWMPand site-specific sequential considerations. From2013 all new developments will be required tosubmit information to Brent’s SUDS Approval Board(SAB) which has a duty to ensure that all newdevelopments have incorporated SUDS to dealwith the surface water run off from the development.WEM 35Flood RiskAll proposed development in Flood Zones 2and 3 will require a detailed Flood RiskAssessment (FRA), in accordance with Section6.7 of Brent’s Strategic Flood RiskAssessment.Applications will be assessed against thesite-specific flood risk mitigation requirementsset out for individual Site Proposals.Development is not suitable in Flood Zone 3b.Application of a site-level sequential approachwill be expected to locate developmenttowards areas of lowest risk within the site.More vulnerable development will not usuallybe appropriate in Flood Zone 3a. Where it isproposed in exceptional circumstances, anException Test will be required.Proposals within Flood Risk Zones 3a (HighProbability and Climate Change) and 2(Medium Probability) will be required to passthe Sequential Test, and where a site isaffected by Flood Zone 3a, the Exception Test
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