The 30% improvement on the peak rate of run-off, required under criterion 6, is only applicable to Brownfield sites. Post-development, Greenfield sites are only required to achieve a peak rate of run-off that is no greater than the pre-developed site.
The 2014 UK NC scheme required both Greenfield and Brownfield sites to not increase the peak rate of run-off as a result of the development. A 30% improvement for brownfield sites is in keeping with BREEAM’s aim to continue to drive improvements and mitigate the impacts of development.
10/08/18 - Technical manual updated. Only relevant to v1.0 of the manual