Welsh Government have now released updated TAN15 guidance and associated supporting flood mapping. TAN15 is the guidance by which all development in Wales is assessed with regards to flood risk from rivers and drainage. Before developing in an area at risk of flooding, it must be demonstrated that the flood risks and consequences can be acceptably managed in line with national planning policy.
The update to the 2004 guidance has been long anticipated and there are significant changes to law and how flood risk is assessed for planning. Planning applications after December 1st 2021, will need to comply with this new guidance. More information about TAN15 can be found on the Natural Resources Wales website.