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CANDOVER ABSTRACTION LICENCE (SO/042/0031/026) RENEWAL 2016 SOLENT and SOUTH DOWNS AREA TECHNICAL ASSESSMENT FINAL REPORT 11Th A

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CANDOVER ABSTRACTION LICENCE (SO/042/0031/026) RENEWAL 2016 SOLENT and SOUTH DOWNS AREA TECHNICAL ASSESSMENT FINAL REPORT 11Th A Candover abstraction licence (SO/042/0031/026) renewal 2016 FINAL REPORT 11 August 2016 CANDOVER ABSTRACTION LICENCE (SO/042/0031/026) RENEWAL 2016 SOLENT AND SOUTH DOWNS AREA TECHNICAL ASSESSMENT FINAL REPORT 11th August 2016 1 Candover abstraction licence (SO/042/0031/026) renewal 2016 FINAL REPORT 11 August 2016 Summary and background We own the Candover abstraction licence (SO/042/0031/026), and the associated augmentation scheme infrastructure in the upper Itchen groundwater catchment. The extant licence is time-limited and is due to expire on 31st December 2016. Before the Candover licence can be renewed, we need to demonstrate that it is environmentally sustainable, in line with Agency policy on licence renewals. The other tests are: continued justification of need; and demonstration of efficient use of water. This is a broad test, but includes the need for a detailed assessment of the impact the Scheme could have on all designated sites as well as considering any potential impacts on non-designated environmental features. This work also needs to consider compliance with objectives specified in the South East River Basin Management Plan. Only if it can be demonstrated that the Scheme has no unacceptable environmental impacts and it meets the remaining two other tests for renewal, can the licence be renewed. Our assessment has shown that the abstraction regime in the Candover sub-catchment of the upper Itchen impacts upon river flows, is causing almost constant failure of ecologically-based flow targets, and has potential uncertain risks to floodplain wetlands and chalkstream headwaters. The key licences are not operated to their full licence limits, so the potential risks of increased abstraction are real. We present our technical assessment and evidence in a series of four reports (Parts 1 and 2, an Appropriate Assessment, and this Final Report) all of which should be referred to for data analysis, discussion and conclusions. We have completed an Appropriate Assessment of the licence and concluded: taking account of the proposed new licence conditions identified through the assessment process, and in view of the SAC Conservation Objectives, a conclusion of no adverse effect on the integrity of the River Itchen SAC arising as a result of the Candover licence (when considered alone, or in-combination with other abstraction licences) can be reached, in the short-term, defined as 31st December 2022. Thereafter, we cannot show that the licence would not have an adverse effect on the integrity of the River Itchen SAC. Furthermore, our assessment of wider ecological impacts and risks concluded:- taking account of the new licence conditions, and considering the unfavourable condition of the site, we conclude that, in the short-term defined as 31st December 2022, the Candover licence is not likely to damage the flora, fauna or geological or physiological features which are of special interest in the River Itchen SSSI, or priority habitats and species. Thereafter, we cannot show that the licence would not have an adverse effect on the integrity of the River Itchen SSSI, or priority habitats and species. We will renew the licence, on a temporary, short-term basis only, and under very different terms to the extant licence. Re-balancing the abstraction regime to restore a natural flow regime, with natural variability, is required to sustain natural processes that shape the form and function of the Candover Stream and support the chalkstream biotope. A step-change in effort to restore a natural flow regime is imperative if the ecological interests are ever to achieve favourable condition. A system that requires intervention like augmentation to achieve ecologically-based flow targets cannot by definition be a long-term self-sustaining one. However, restoring a more natural flow regime will take time. We will investigate the abstraction licences that affect the Candover- sub catchment through the water company National Environment Programme (NEP) process. Scoping and investigations will be carried out in NEP6 (2020-2025) with option implementation starting in NEP7 (2025-30). In the meantime, the impacts and risks to the Candover from those licences will continue unabated. In the meantime, to counter these risks, we will retain the Candover licence, with the capacity to augment river flows, in the event it is needed for ecological support. In that respect it is a ‘safety-net’, or insurance policy, should the Environment Agency and Natural England agree it is needed at any particular time, whilst the effects of, and risks from, other extant licences remain in place. This is a short-term measure - we will time-limit the licence to 2022 to review the ‘need’. It is possible the need will remain until the NEP investigation is complete and actions implemented i.e. beyond 2025. We do not foresee augmentation being part of the long-term solution. This report presents the changes we will make to the Candover abstraction licence when we renew it this year. We will :- significantly reduce the licence limits; add new conditions to the licence; time-limit the licence. 2 Candover abstraction licence (SO/042/0031/026) renewal 2016 FINAL REPORT 11 August 2016 Our Part 1 and Part 2 assessments of the existing Candover licences The conclusions of our Part 1 report assessment of the hydrological effects of the existing Candover licence are summarised in a series of Tables 8a to 8d, taken from our Part 1 report, and set out in Appendix A to this Final Report. The conclusions of our Part 2 report assessment of the ecological effects of the existing Candover licence are summarised in a series of Tables 7.1 to 7.3, taken from our Part 2 report, and set out in Appendix B to this Final Report. The ecological risks from the existing Candover licence are also summarised below. River Itchen SAC The existing Candover licence can be shown to be having a likely significant effect on the River Itchen SAC, alone (moderate confidence). An Appropriate Assessment is required before the licence could be considered to be sustainable in the short or long term. Until then the licence cannot be renewed in its existing form. In-combination with extant groundwater abstraction licences in the Candover aquifer, the existing Candover licence can be shown be having a likely significant effect the River Itchen SAC (moderate confidence). An Appropriate Assessment is required before the licence could be considered to be sustainable in the short or long term. Until then the licence cannot be renewed in its existing form. Other extant abstraction licences that effect the groundwater and surface water of the Candover valley require assessment against the tests of the Habitats Regulations, 2010 because our work shows they are causing river flows to frequently fail a suite of ecologically-based river flow targets, including revised CSMG (moderate confidence). River Itchen SSSI The existing Candover licence alone presents uncertain negative risks to the River Itchen SSSI (wetland habitats and associated bird populations), potentially sufficient to prevent restoration to favourable condition (uncertain confidence). Further investigation is required before the licence could be considered to be sustainable in the short or long term, until then the licence cannot be renewed in its existing form. In-combination with extant groundwater abstraction licences in the Candover aquifer, the existing Candover licence presents uncertain negative risks to the River Itchen SSSI, potentially sufficient to prevent restoration to favourable condition (uncertain confidence). Further investigation is required before the licence could be considered to be sustainable in the short or long term, until then the licence cannot be renewed in its existing form. River Itchen priority habitats and species The existing Candover licence alone presents uncertain negative risks to a range of priority wetland habitats and associated species in the Candover Stream floodplain (low confidence). Further 3 Candover abstraction licence (SO/042/0031/026) renewal 2016 FINAL REPORT 11 August 2016 investigation is required before the licence could be considered to be sustainable in the short or long term, until then the licence cannot be renewed in its existing form. In-combination with extant groundwater abstraction licences in the Candover aquifer, the existing Candover licence presents uncertain negative risks to a range of priority wetland habitats and associated species in the Candover Stream floodplain (low confidence). Further investigation is required before the licence could be considered to be sustainable in the short or long term, until then the licence cannot be renewed in its existing form. Wider biodiversity The existing Candover licence alone presents uncertain negative risks to the chalkstream headwater habitats on the River Alre, River Dever, River Wey & Candover Stream (low confidence). Further investigation is required before the licence could be considered to be sustainable in the short or long term, until then the licence cannot be renewed in its existing form. In-combination with extant groundwater abstraction licences in the Candover aquifer, the existing Candover licence presents uncertain negative risks to the chalkstream headwater habitats on the River Alre, River Dever, River Wey and Candover Stream (low confidence). Further investigation is required before the licence could be considered to be sustainable in the short or long term, until then the licence cannot be renewed in its existing
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