Water Cycle Study - East Devon District Council

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Ref EWCS April 2010 Exeter and East Devon Water Cycle Study consent required, however these improvements will be driven by the RBMP process and should not be considered a constraint to growth. Otterton 6.4.19 Otterton WwTW has the consented capacity for all projected growth up to 2026. Currently there is a BOD consent of 40 mg/l and no ammonia consent has been set. Otterton WwTW has a coastal discharge to Lyme Bay West, which is high in terms of physiochemical status and classified as good for biological status and moderate for ecological status. To meet WFD good status WwTW improvements may be needed and a tighter quality consent required, however these improvements will be driven by the RBMP process and should not be considered a constraint to growth. Seaton South 6.4.20 Seaton South WwTW has consented capacity for growth up to 2011 (500 dwellings) however the flow consent is breached by 2016. Seaton South discharges to the Axe Estuary. 6.4.21 The Environment Agency is currently in advanced discussions to determine a new consent application for Seaton South WwTW, which will increase the consented dry weather flow to a value in excess of the flow forecasted for 2026 by this study (Table 6.2). The Environment Agency has made the necessary assessments (based on a design horizon of 2016-2021) and awaits formal submission of the consent application. Sidmouth 6.4.22 Sidmouth WwTW has consented capacity for all growth up to 2026 (1000 dwellings). The WwTW has a coastal discharge to Lyme Bay West. which is high in terms of physiochemical status and classified as good for biological status and moderate for ecological status. To meet WFD good status WwTW improvements may be needed and a tighter quality consent required, however these improvements will be driven by the RBMP process and should not be considered a constraint to growth. 6.5 Wastewater network capacity 6.5.1 South West Water have carried out a high level assessment of the implications of the development scenarios being tested by this study on the wastewater network. The results are shown in Table 6.2 and summarised below. South West Water have generally not identified any areas of network capacity concern at this outline stage and on this basis consider there to be a reasonable prospect of delivery of all of the development scenarios within the normal planning process timeframe. It is recommended that SWW are consulted as soon as a site is identified for development; SWW recommend that once precise locations, numbers and timescales are known then it is at that stage that SWW will be able to undertake a detailed assessment of what impacts the development will have on the network and what, if any, infrastructure is specifically required. Exeter urban area (Sites C1-C4 and T1) 6.5.2 South West Water have not identified any of the Exeter City or Alphington urban extension growth areas as being of particular concern at this outline stage. Any 60
Exeter and East Devon Water Cycle Study development on previously developed land, on urban infill or windfall development has the potential to cause foul flooding or an increase in CSO discharge downstream of the development location. 6.5.3 SWW should be consulted on any proposed development within the urban area as soon as a site is identified for development. Provided that SWW are consulted during the site allocations DPD (should urban infill be allocated during this stage) or at the outline planning application stage, SWW are confident that they are able to provide or requisition sewerage network capacity during the normal planning timetable. Cranbrook new community (Sites E0 – E8) 6.5.4 The Cranbrook new community will require a new sewerage drainage network in association with the provision of the new Cranbrook WwTW. SWW have allocated funding in their AMP5 plan (2010-2015) for the provision of wastewater infrastructure to serve the first phase of the new community development (2900 dwellings). 6.5.5 South West Water have not identified any material differences – in terms of wastewater network provision - between the options for expansion of Cranbrook being tested in this study. The proposed Cranbrook WwTW will be of a modular construction to allow incremental expansion of the WwTW in phase with the development of the new community. East of Exeter urban extension (Sites E9 – E12 & ECS) 6.5.6 SWW have not identified any differences between any of the urban extension options with respect to sewerage capacity and no specific areas have been highlighted as causing concern at this outline stage. It is recommended that SWW should be consulted on any proposed development as soon as a site is identified for development. Provided that SWW are consulted during the site allocations DPD or at the outline planning application stage, SWW are confident that they are able to provide or requisition sewerage network capacity during the normal planning timetable. Other East Devon settlements (Sites E13 – E22) 6.5.7 SWW have not identified any differences between any of the East Devon settlements with respect to sewerage capacity and no specific areas have been highlighted as causing concern at this outline stage. It is recommended that SWW should be consulted on any proposed development as soon as a site is identified for development. If SWW are consulted during the site allocations DPD or at the outline planning application stage, SWW are confident that they are able to provide or requisition sewerage network capacity during the normal planning timetable. Commercial development (Sites D1 – D4) 6.5.8 Wastewater from the Science Park and Skypark developments will need to drain to Countess Wear WwTW, via existing wastewater networks. Exeter International Airport currently operates a private sewage treatment plant, however the masterplan for the Airport Expansion includes proposals to direct sewage from the site to the new Cranbrook WwTW and de-commission the existing private plant. 6.5.9 SWW have not identified any significant network capacity concerns at this outline stage, but it is recommended that SWW should be consulted as the proposals and planning 61 Ref EWCS April 2010
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