Targets and Justification
- Best
- For annual flow rate probabilities up to and including the 1 in 100yr event including allowance for climate change. Completed development run off rate should be less than the rate prior to development. Calculation should consider both volume and peak flow
- Good
- For annual flow rate probabilities up to and including the 1 in 100yr event and allowance for climate change. Completed development run off rate should be no greater than that prior to development. A 15-20% reduction is sought compared to greenfield site
- Minimum
- Local Authority standard use of Sequential Test (Annex D PPS25).
Applies to Developments
This question applies to Small, Medium and Large developments.
