Approach to certain International Nature Conservation Designations

Natural England’s current advice, including a methodology to calculate a development’s nutrient budget is available from this page. The Following Court of Justice of the European Union (CJEU) judgements, Natural England has provided advice on the impacts of nutrients from new development on the group of SPA and SAC designations, within and around the Solent. There are high levels of nitrogen and phosphorous entering the water environment and these nutrients are causing eutrophication, resulting in dense mats of green algae impacting on the protected habitats and species.

Due to the uncertainty that new development will not cause further impact, and in order to be precautionary, the recommended approach is for new development to achieve nutrient neutrality, which is a means of ensuring that new development does not add to existing nutrient loading. A development scheme’s nutrient budget should therefore be calculated, taking account of both wastewater and land use change. This will inform whether the development avoids harm to the protected designations, or needs to provide mitigation to ensure that there is no adverse effect.

This applies to the area of the Borough which falls within the catchments of the River Test and River Itchen and their tributaries, which then flow into the Solent, with the exclusion of a small area around Shipton Bellinger and Cholderton, which falls within the catchment of the River (Hampshire) Avon.

For the area of the Borough which drains to the Chickenhall Waste Water Treatment Works, (which discharges into the River Itchen), which covers Valley Park, and the Hocombe area of Ampfield, additionally nutrient neutrality for Phosphorus is also needed for the wastewater element only (see River Itchen SAC – Nutrient Neutrality). 

The latest advice (March 2022) has updated and revised the previous June 2019, March 2020, June 2020 and March 2022 versions, which have been superseded. The advice is accompanied by supporting guidance documentation and a revised (January 2024) nutrient budget calculator tool for nitrogen.

We are working in partnership with a number of organisations to address the potential for new development to impact on this designation in relation to disturbance of the bird species through the recreational use of this area. 

It has been identified that certain new developments within 5.6km of the Solent SPA designations (see document titled ‘5.6km Solent SPA Buffer Map’), including the Solent and Southampton Water SPA, are likely to have a significant effect when considered in combination.

The Solent Recreation Mitigation Strategy sets out the approach to providing mitigation in relation to this matter. It was approved by the Council’s Cabinet on 17 January 2018. Unless evidence can be provided to demonstrate that relevant proposals would not lead to a likely significant effect, mitigation would need to be provided. This could either be through a financial contribution, or a bespoke mitigation package, as set out within the strategy (available from this page). Additional information is available from the Bird Aware Solent website.

As set out in the strategy, where mitigation is provided through a financial contribution, the figures will be increased on 1 April each year in line with the Retail Price Index. The latest figures for financial contributions can be found here:https://birdaware.org/solent/about-us/our-strategy/developer-contributions/

Through the Revised Local Plan, we identified the potential for new residential development in parts of the Borough to have a likely significant effect on the New Forest when considered in combination in relation to recreational pressures. The council has adopted a Supplementary Planning Document (SPD) on this matter, which is available here

We have been working with Natural England and the Hampshire and Isle of Wight Wildlife Trust to update evidence in relation to the hydrology of Emer Bog and Baddesley Common, including the relevant hydrological catchment. The latest study is available from this page along with an associated guidance note setting out a summary of the implications, including the evidence that may be required to accompany planning applications within the hydrological catchment for this designation.

Natural England’s current advice, including a methodology to calculate a development’s nutrient budget is available from this page. The Following Court of Justice of the European Union (CJEU) judgements, Natural England has provided advice on the impacts of nutrients from new development on the River Itchen SAC designation. There are increased of nitrogen and phosphorous entering the water environment entering the River Itchen and these nutrients are causing algal blooms which disrupt normal ecosystem function and cause major change in the aquatic community, impacting on the protected habitats and species.

Due to the uncertainty that new development will not cause further impact, and in order to be precautionary, the recommended approach is for new development to achieve nutrient neutrality, which is a means of ensuring that new development does not add to existing nutrient loading. A development scheme’s nutrient budget should therefore be calculated, taking account of both wastewater and land use change. This will inform whether the development avoids harm to the protected designations, or needs to provide mitigation to ensure that there is no adverse effect.

This applies to the area of the Borough which drains to the Chickenhall Waste Water Treatment Works, (which discharges into the River Itchen), which covers Valley Park, and the Hocombe area of Ampfield. For this area nutrient neutrality for Phosphorus is needed for the wastewater element only. This is in addition to the need for Nitrogen nutrient neutrality for the development (see Solent region SPAs and SACs – Nutrient Neutrality). 

The latest advice (March 2022)  is accompanied by supporting guidance documentation and a revised (January 2024) nutrient budget calculator tool for phosphorus.

Natural England’s current advice, including a methodology to calculate a development’s nutrient budget is available from this page. The Following Court of Justice of the European Union (CJEU) judgements, Natural England has provided advice on the impacts of nutrients from new development on the River Itchen SAC designation. There are increased of nitrogen and phosphorous entering the water environment entering the River Itchen and these nutrients are causing algal blooms which disrupt normal ecosystem function and cause major change in the aquatic community, impacting on the protected habitats and species.

Due to the uncertainty that new development will not cause further impact, and in order to be precautionary, the recommended approach is for new development to achieve nutrient neutrality, which is a means of ensuring that new development does not add to existing nutrient loading. A development scheme’s nutrient budget should therefore be calculated, taking account of both wastewater and land use change. This will inform whether the development avoids harm to the protected designations, or needs to provide mitigation to ensure that there is no adverse effect.

This applies to the area of the Borough which falls within the catchment of the River (Hampshire) Avon which covers an area around Shipton Bellinger and Cholderton.

The latest advice (March 2022) is accompanied by supporting guidance documentation and a revised (January 2024) nutrient budget calculator tool for phosphorus.