The Oxfordshire Plan would require the following:
1) Development to take account of both its impact on flood risk and the potential impacts of flood risk on the development and its future occupiers/users.
2) Development to utilise natural flood management and drainage methods, including:
a) the use of appropriate green infrastructure;
b) the use of sustainable drainage systems (SuDS);
c) the use of design measures (such as the use of permeable external surface materials);
d) maximising opportunities to restore natural river flows and floodplains;
e) avoiding building over or culverting watercourses;
f) and removing existing culverts wherever possible.
3) Major development to comply with Oxfordshire County Council's Local Standards and Guidance for Surface Water Drainage on Major Development in Oxfordshire (published November 2018) or any subsequent standards/guidance which might supersede this. Additional SuDS features may be required where there are impact pathways on habitats of national and international importance.
4) Where existing built development in Flood Zone 3b is proposed to be redeveloped or extended, opportunities would be taken to ensure that the new development is resilient to flooding over its lifetime. Replacement buildings in Flood Zone 3b to have finished floor levels above the 1 in 100 year flood level, plus an allowance for climate change.
5) Flood risk evidence to support local plans to identify areas of the functional floodplain (Flood Zone 3b) where householder development and small non-residential extensions are having a cumulative impact on flood risk. Opportunities to manage development in Flood Zone 3b that would otherwise be permitted under the General Permitted Development Order 2015 (as amended) to be considered.
6) The Oxfordshire authorities to work with the Environment Agency and other stakeholders to support a catchment-based approach to flood risk management across the Thames catchment area. Schemes that utilise natural flood management methods and deliver wider benefits for Oxfordshire's communities, wildlife and businesses would be supported and prioritised.
7) Flood risk management and mitigation measures identified within the SFRA to be incorporated within the policy framework as appropriate.
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