East Cambridgeshire District Council Water Cycle Study Detailed ...

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Stage 2 Water Cycle Study: Final Report Sept 2011 6 Cambridgeshire Horizons East Cambridgeshire – Detailed WCS specific assessment of the potential constraints on each of the growth sites where the majority of development within the District is likely to take place. The following policies are also recommended to deliver the Water Cycle Strategy: WW1 – development phasing Burwell Development in Burwell will need to be restricted to a minimal annual completion rate to be agreed with AWS and EA until a new solution is in place post 2015. WW2 – development phasing Bottisham Development in Bottisham will need to be restricted to a minimal annual completion rate to be agreed with AWS and EA until a new solution is in place post 2015. WW3 – WwTW expansion Expansion of the following WwTW sites should be supported: Witchford, Littleport and Soham. Water Supply WS1 – Water Efficiency in new homes Ensure all housing is water efficient, new housing development must go beyond Building Regulations and as a minimum reach Code for Sustainable Homes Level 1/2 . WS2 – Water Efficiency Retrofitting Carry out a programme of retrofitting and water audits of existing dwellings and non-domestic buildings. Aim to move towards delivery of 10% of the existing housing stock with easy fit water savings devices WS3 – Water Efficiency Promotion Establish a programme of water efficiency promotion and consumer education, with the aim of behavioural change with regards to water use. SWM1 – sewer separation Developers should ensure foul and surface water from new development and redevelopment are kept separate where possible. Where sites which are currently connected to combined sewers are redeveloped, the opportunity to disconnect surface water and highway drainage from combined sewers must be taken. SWM2 – above ground drainage Developers should aspire to achieve 100% above ground drainage for all future developments, where feasible. Where this is not feasible due to for example housing densities, land take, ground conditions, topography, or other circumstances, the development proposals should maximise opportunities to use SuDS measures which require no additional land take, i.e. green roofs, permeable surfaces and water butts. SWM3 – SuDS and Green Infrastructure Developers should ensure linkage of SuDS to green infrastructure to provide environmental enhancement and amenity, social and recreational value. SuDS design should maximise opportunities to create amenity, enhance biodiversity, provide urban cooling and contribute to a network of green (and blue) open space. SWM4 – SuDS and Water Efficiency Developers should ensure linkage of SuDS to water efficiency measures, including rainwater harvesting.
SWM5 – Linkages to SWMP and SFRA Stage 2 Water Cycle Study: Final Report Sept 2011 7 Cambridgeshire Horizons East Cambridgeshire – Detailed WCS Developers should ensure SuDS design supports the findings and recommendations of the Cambridgeshire wide Surface Water Management Plan (SWMP) and East Cambridgeshire SFRA. SWM6 – Water Quality Improvements Developers should ensure, where possible that discharges of surface water are designed to deliver water quality improvements in the receiving watercourse or aquifer where possible to help meet the objectives of the Water Framework Directive. ECO1 – Phasing at Burwell WwTW The Council includes a policy within its Core Strategy that ensures that phasing of housing to be connected to Burwell WwTW is timed such that it does not result in exceedence of the volumetric capacity before the WwTW is able to achieve the tightened P limit on its effluent discharge and that detailed assessment has confirmed that it is compatible with the requirements of both the WFD and the Conservation (Habitats and Species) Regulations 2010. ECO2 – Biodiversity enhancement It is recommended that the Council include a policy in its Core Strategy which commits to seeking and securing (through planning permissions etc) enhancements to aquatic biodiversity in East Cambridgeshire through the use of SuDS and other means as outlined in this WCS (subject to appropriate project-level studies to confirm feasibility including environmental risk and discussion with relevant authorities) in line with the Cambridgeshire Green Infrastructure Strategy. In addition, the following recommendations are also made by the study: • key partners in the WCS maintain regular consultation with each other as development proposals progress; • further potential modelling studies are undertaken either as part of site specific planning applications or Anglian Water proposals to increase WwTW capacity to better inform potential impact of development on ecological sites; • the WCS should remain a living document, and be reviewed on an annual basis as development progresses and appropriate changes are made to the various studies and plans that support it; • consider the change to Planning Policy Statements that will occur as a result of consolidation of national planning policy into a single National Planning Policy Framework and how this may affect the overall water cycle strategy; and • consider how policies may need to change as the Localism Bill takes effect through 2011 into 2012. A detailed flow modelling study is required to investigate the flows in the lodes around Wicken Fen and particularly the potential for Burwell Lode to become hydrologically connected to the Fen and Wicken Lode under a range of future flow scenarios as a result of both an increase in the discharge volume from Burwell WwTW and the recent implementation of a project to pump water from Monks Lode during the winter which may affect the ability of Wicken Lode to continue to prevent backflow from Burwell Lode/Reach Lode. This study should also confirm that in such circumstances a consent limit of 0.25 mg/l of P will still be sufficient to prevent any deterioration of P loading in the Fen (including Wicken Lode). A specific further study is also required before the volumetric consents for Witcham WwTW and Littleport WwTW are exceeded to confirm that achieving ‘no deterioration’ within the receiving watercourses will be
Page 1 and 2: East Cambridgeshire District Counci
Page 3 and 4: Table of Contents Cambridgeshire Ho
Page 5 and 6: Executive Summary Stage 2 Water Cyc
Page 7 and 8: Stage 2 Water Cycle Study: Final Re
Page 9: Surface Water Drainage Management S
Page 13 and 14: Glossary of Acronyms and Abbreviati
Page 15 and 16: Abbreviation Description RTPI Royal
Page 17 and 18: 1.3 Stage 2 - Study Governance Stag
Page 21 and 22: • Surface Water Management Plan f
Page 23 and 24: 2 Proposed Growth 2.1 Preferred Gro
Page 25 and 26: 2.3 Employment Stage 2 Water Cycle
Page 27 and 28: Figure 2-1: Potential development s
Page 29 and 30: Relevant WwTW Stage 2 Water Cycle S
Page 33 and 34: WwTW Soham Burwell Bottisham Hadden
Page 36 and 37: 3.2.2 Results Discussion WwTW Soham
Page 38 and 39: WwTW Consent parameter Stage 2 Wate
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3.4.1 Stage 2 network assessment re
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Site Description of potential waste
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Site Description of potential waste
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Bottisham Site Assessment Site Desc
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Stage 2 Water Cycle Study: Final Re
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Impact on Supplies Stage 2 Water Cy
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Low flow taps and showers Stage 2 W
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Figure 4-1: A typical domestic rain
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Medium Scenario The key assumptions
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Table 4-7: Details of new Build Spe
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WN Scenario New development Water u
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Operation of GWR £30 per annum 82
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Table 4-12: Estimated Cost of Neutr
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Figure 4-3: CO2 emissions from a
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4.4.7 Preferred strategy - delivery
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5 Surface Water Management 5.1 The
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• continuous surfaces with an inh
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5.5.1 Ecological opportunities Ely
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Site Stage 2 Water Cycle Study: Fin
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5.5.7 SuDS and groundwater protecti
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Lisle Lane, Ely 2.855 2.28 1,038 -
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Land rear of Fordham Road, Soham 2.
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6.3.3 Wastewater Network constraint
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6.4.4 Phasing Assessment Phase Dwel
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7.2 Climate Change and the Water Cy
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Directive/Legislation/Guidance Desc
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Key Additional development can be a
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Consents to achieve ‘Good Status
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MASS BALANCE CALCULATION: MONTE CAR
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LITTLEPORT STW Current Quality Cons
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HADDENHAM STW Current Quality Conse
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Sequencing Batch Reactor Stage 2 Wa
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Tertiary treatment Stage 2 Water Cy
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East Cambridgeshire WCS Flood Estim
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