Utilities and Wastewater Statement - Runnymede Borough Council
Utilities and Wastewater Statement - Runnymede Borough Council
Utilities and Wastewater Statement - Runnymede Borough Council
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ContentsDocument ControliContentsiiIntroduction 2Water 2<strong>Wastewater</strong> (Foul Drainage) 3Gas 4Electricity 5Telecommunications 6Appendix A - Water 7Appendix B - <strong>Wastewater</strong> 10Appendix C - Gas 13Appendix D - Electricity 14creative minds safe h<strong>and</strong>sA070650--11<strong>Utilities</strong> & <strong>Wastewater</strong> <strong>Statement</strong>Date: 26 July 2012Reference:www.wyg.comRevision 00
IntroductionThis <strong>Utilities</strong> <strong>and</strong> <strong>Wastewater</strong> <strong>Statement</strong> supports an outline planning application to <strong>Runnymede</strong> <strong>Borough</strong> <strong>Council</strong>(RBC) for the demolition of existing buildings <strong>and</strong> its mixed use redevelopment, including up to 79,000 sqm of ClassB1 employment uses; up to 36,000 sqm of Data Centres (including ancillary facilities); up to 200 dwellings; <strong>and</strong> upto 6,300 sqm of ancillary facilities (including retail uses, café/restaurants <strong>and</strong> a public house; health, leisure,childcare <strong>and</strong> hotel facilities; <strong>and</strong> a primary education facility) at the DERA North site, Longcross.This document provides evidence that the additional water, gas, electricity, telecommunication <strong>and</strong> sewage dem<strong>and</strong>or loads generated by this development can be met, <strong>and</strong> summarises any capital works that are required in supportof this activity. Details of all consultation with the statutory utility undertakers, including capacity assessments,meetings <strong>and</strong> other forms of communication are appended to this document. N.B. All consultations with thestatutory undertakers, including network modelling, was undertaken in spring 2012 <strong>and</strong> based on water, wastewater<strong>and</strong> energy dem<strong>and</strong>s derived for a notional accommodation schedule of 80,000sqm of B1, 4030sqm of retail <strong>and</strong>212 residential units. This ensures that all daily <strong>and</strong> seasonal peak dem<strong>and</strong>s can be met.This document considers infrastructure capacity <strong>and</strong> infrastructure need based on daily <strong>and</strong> seasonal peak dem<strong>and</strong>sgenerated by the development. This is not a sustainability statement <strong>and</strong> does not consider the annual <strong>and</strong> life-timeconsumption of finite <strong>and</strong> other resources.The incumbent licensed water undertaker is Veolia Water, the incumbent gas network operator is National Grid Gas,the host electricity distribution network operator is SSE Power Distribution, the licensed sewerage undertaker isThames Water <strong>and</strong> the regulated open-access voice-data-video network operator is Openreach (a BT Company).WaterThe estimated water dem<strong>and</strong> for DERA North has been calculated using BSRIA Rules of Thumb 2003, with referenceto BS6700: 1997 Section 2. Essentially a dem<strong>and</strong> of 167 litres per capita is utilised for dwelling types with 45 litresper capita used for retail uses <strong>and</strong> 100 litres per capita for office workers. A summary of the estimated average <strong>and</strong>peak water dem<strong>and</strong> is provided below;Table 1: New Water Dem<strong>and</strong>PhaseAverage DailyFlowratePhase 1 Residential (max 135 units) 0.61 l/s 1.83 l/sPhase 1 Commercial (40,000m 2 B1 + 2015m 2 retail) 3.45 l/s 8.63 l/sPhase 2 Residential (max 77 units) 0.34 l/s 1.02 l/sPhase 2 Commercial (40,000m 2 B1 + 2015m 2 retail) 3.45l/s 8.63 l/sPeak FlowrateDERA NORTH TOTAL 7.85l/s 20.11 l/screative minds safe h<strong>and</strong>sA070650--11<strong>Utilities</strong> & <strong>Wastewater</strong> <strong>Statement</strong>Date: 26 July 2012Reference:- 2 -
In response to a formal capacity enquiry Veolia Water has confirmed that the residential development can bedelivered through a direct connection onto the local 6” <strong>and</strong> 8” water mains currently located in Chobham Lane.The provision of suitable flow <strong>and</strong> pressure to the first half of the commercial development will require merely theadjustment of a zonal metering valve (increasing the inlet pressure on a local pressure reducing valve to 55m head),<strong>and</strong> no off-site reinforcement.The second half of the commercial development would trigger 3,015m of offsite network reinforcement betweenKitsmead Road <strong>and</strong> St Peters Hospital, wholly within Longcross Road. A small section of additional reinforcement(circa 56m) would also be required at the northern end of Kitsmead Road.<strong>Wastewater</strong> (Foul Drainage)<strong>Wastewater</strong> loads have been calculated using British Water Code of Practise: Flows <strong>and</strong> Loads 3 benchmarkedagainst Sewers for Adoption <strong>and</strong> then referenced to the likely potable water dem<strong>and</strong> for the site. In the table below1DWF (Dry Weather Flow) is supplemented by 6DWF as used commonly in Sewers for Adoption calculations.Table 2: New Foul FlowsPhaseDry WeatherFlow (Foul)Phase 1 Residential (max 135 units) 1.04 l/s 6.24 l/sPhase 1 Commercial (40,000m 2 B1 + 2015m 2 retail) 1.28 l/s 7.68 l/sPhase 2 Residential (max 77 units) 0.59 l/s 3.54 l/sPhase 2 Commercial (40,000m 2 B1 + 2015m 2 retail) 1.28l/s 7.68 l/s6 Dry WeatherFlows (Foul)DERA NORTH TOTAL 4.19l/s 25.14 l/sCurrently foul water from the north site drains through a combination of gravity <strong>and</strong> vacuum networks <strong>and</strong> is thenpumped via a rising main under the M3 motorway to Longcross Lane where it outfalls into a Thames Water gravitysewer. The Thames Water network then drains these flows by gravity to a small pumping station at the southernend of Kitsmead Lane. Sewage is then pumped via a rising main <strong>and</strong> subsequent gravity system through TrumpsGreen, via the Bourne River Valley to the Trumps Green pumping station in Virginia Water, which in turn pumps tothe Chertsey Sewage Treatment Works. There is currently sufficient capacity at Chertsey Sewage Treatment Worksto accommodate the foul flows from the DERA North Site.At a meeting between WYG <strong>and</strong> Thames Water on 12 June 2012, Thames Water confirmed that the discharge of allnew foul flows from the DERA North site will continue to be via their existing gravity sewer in Longcross Lane. Thisreceiving sewer in Longcross Lane should have sufficient spare capacity to provide a level of attenuation that increative minds safe h<strong>and</strong>sA070650--11<strong>Utilities</strong> & <strong>Wastewater</strong> <strong>Statement</strong>Date: 26 July 2012Reference:- 3 -
t<strong>and</strong>em with a well-designed new onsite pumping station, will be able to mitigate any increased flows upstream ofTrumps Green pumping station.Effectively Thames Water confirmed in writing on 3 July 2012 that they will provide a suitable outfall to drain all foulflows from DERA North into a sewer in Longcross Lane adjacent to the existing outfall, with no further requirementfor off-site network reinforcement, provided the flow-rate can be limited to the existing flow-rate from the site. Thiswill require the design <strong>and</strong> installation of a new onsite pumping station within the DERA North site that has somestorage capability <strong>and</strong> a flexible pumping regime. The new pumping station, a suitable rising main <strong>and</strong> all upstreamgravity sewers will be adopted by Thames Water under Section 104 of the Water Industry Act 1991.GasThe peak <strong>and</strong> annual gas loads have been taken as 70W/m2 <strong>and</strong> 97kWh/m2 respectively as taken from EnergyEfficiency Best Practise Programme Guide 19 (Energy Use in Offices). The residential gas loads have been takenfrom Ofgem Factsheet 96 dated January 2011, whilst the retail gas loads have been developed using BSRIAelectrical load is calculated using 23.75VA/m2 for residential dwellings as taken from BSRIA Rules of Thumb 2011.The peak <strong>and</strong> annual loads are calculated as follows;creative minds safe h<strong>and</strong>sA070650--11<strong>Utilities</strong> & <strong>Wastewater</strong> <strong>Statement</strong>Date: 26 July 2012Reference:- 4 -
Table 3: New Gas Dem<strong>and</strong>PhasePeak Load(kW)Annual Quantity(AQ) kWh/yrPhase 1 Residential (max 135 units) 855kW 2,227,500 kWh/yrPhase 1 Commercial (40,000m 2 B1 + 2015m 2 retail) 2,800kW 3,880,000 kWh/yrPhase 2 Residential (max 77 units) 435kW 1,270,500 kWh/yrPhase 2 Commercial (40,000m 2 B1 + 2015m 2 retail) 2,800kW 3,880,000 kWh/yrDERA NORTH TOTAL 6,890kW 11,275,000 kWh/yrNational Grid Gas is the licensed gas network operator for this region. In response to a formal capacity assessmentdated 19 March 2012 National Grid Gas stated in their response of 20 March 2012 that the whole of the DERA site(North <strong>and</strong> South) can be supplied from the 100mm ductile iron low-pressure gas network located within the DERANorth site. No network reinforcement is anticipated.ElectricityThe peak electrical load for the residential dwellings is calculated using 23.75VA/m2 for residential dwellings astaken from Ofgem Factsheet 96 dated January 2011 (which equates to an average 1.44kVA per 2-bed apartment<strong>and</strong> 2.86kVA per 4-bed house). For this office accommodation 121.25VA/m2 has been taken from Energy EfficiencyBest Practise Programme Guide 19 (Energy Use in Offices), whilst 200VA/m2 has been used for the retail (based onBSRIA Rules of Thumb 2011 with a small uplift). The peak loads are calculated as follows;Table 4: Peak Electricity LoadsPhasePhase 1 Residential (max 135 units)Phase 1 Commercial (40,000m 2 B1 + 2015m 2 retail)Phase 2 Residential (max 77 units)Phase 2 Commercial (40,000m 2 B1 + 2015m 2 retail)DERA NORTH TOTALPeak Load (kVA)320.5 kVA5,452 kVA175.5 kVA5,452 kVA11,400kVA (11.4MVA)A comprehensive consultation with SSE Power Distribution (SSE), the host Distribution Network Operator (DNO),concluded with a meeting dated 5 April 2012, the minutes of which are appended.SSE confirmed that an additional 7-8MVA of capacity was created on the existing 33kV circuit which feeds theexisting 33/11kV MVEE Primary Substation located within the DERA site.creative minds safe h<strong>and</strong>sA070650--11<strong>Utilities</strong> & <strong>Wastewater</strong> <strong>Statement</strong>Date: 26 July 2012Reference:- 5 -
Effectively all of the residential development <strong>and</strong> more than half of the commercial development can beaccommodated from the existing primary substation located within the site, providing a Data Centre is notdeveloped within phase 1.Should the existing MVEE substation be relocated elsewhere within the site to accommodate the new developmentany new substation connected to the local 33kV network can provide sufficient power to supply all of the residentialdevelopment <strong>and</strong> more than 50% of the commercial load.In order to accommodate the last few buildings within the commercial site, the existing SSE operated 33kV networkwill need to be reinforced between the Primary Substation at Western Road in Bracknell <strong>and</strong> a location just outsidethe DERA site, a distance of 7-8km.If the Data Centres are developed then the North site the peak electricity dem<strong>and</strong> will be somewhere between46MVA <strong>and</strong> 51MVA. In this case a new 132/11kV primary substation will be located on the site. The 132kV point ofconnection will either be Laleham Bulk Supply Point Substation (SSE connection) or West Weybridge Bulk SupplyPoint Substation (UK Power Networks Connection). This new onsite 132/11kV substation will have a maximumcapacity of 60MVA.TelecommunicationsOpenreach, the UK’s regulated open-access network operator <strong>and</strong> wholly owned by BT, has a statutory duty toprovide voice, data <strong>and</strong> video (VDV) infrastructure services. Openreach is currently rolling-out a programme todeliver 300Mbps download Fibre to the Home (FTTH) platforms for residential developments over 50 dwellingswhere the local telephone exchange has been enabled with Fibre to the Cabinet (FTTC). DERA can currently beserved from Chobham <strong>and</strong> Wentworth telephone exchanges, neither of which is in the current FTTC rolloutprogramme. Therefore DERA will likely be served by copper services extended from the existing network inChobham Lane unless BT is lobbied to bring forward their fibre investment programme. There is also a BT ownednetwork to the north of the site parallel with the railway line.Chobham Telephone Exchange <strong>and</strong> Wentworth Telephone Exchange are not located within 2km of the site <strong>and</strong>there is no FTTC programme so the likely speed of broadb<strong>and</strong> services will be moderate in the near future.creative minds safe h<strong>and</strong>sA070650--11<strong>Utilities</strong> & <strong>Wastewater</strong> <strong>Statement</strong>Date: 26 July 2012Reference:- 6 -
Appendix A - WaterA070650--11<strong>Utilities</strong> & <strong>Wastewater</strong> <strong>Statement</strong>Date: 26 July 2012Reference:creative minds safe h<strong>and</strong>s- 7 -
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Appendix B - <strong>Wastewater</strong>A070650--11<strong>Utilities</strong> & <strong>Wastewater</strong> <strong>Statement</strong>Date: 26 July 2012Reference:creative minds safe h<strong>and</strong>s- 10 -
A070650--11<strong>Utilities</strong> & <strong>Wastewater</strong> <strong>Statement</strong>Date: 26 July 2012Reference:creative minds safe h<strong>and</strong>s- 11 -
A070650--11<strong>Utilities</strong> & <strong>Wastewater</strong> <strong>Statement</strong>Date: 26 July 2012Reference:creative minds safe h<strong>and</strong>s- 12 -
Appendix C - GasA070650--11<strong>Utilities</strong> & <strong>Wastewater</strong> <strong>Statement</strong>Date: 26 July 2012Reference:creative minds safe h<strong>and</strong>s- 13 -
Appendix D - ElectricityA070650--11<strong>Utilities</strong> & <strong>Wastewater</strong> <strong>Statement</strong>Date: 26 July 2012Reference:creative minds safe h<strong>and</strong>s- 14 -
A070650--11<strong>Utilities</strong> & <strong>Wastewater</strong> <strong>Statement</strong>Date: 26 July 2012Reference:creative minds safe h<strong>and</strong>s- 15 -
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