WwTW design considerations for low flows – A climate change requirement: PRESENTATION ONLY

Pete Pearce, Director, Farmiloe Fisher Environment, UK


UK climate change – the low flow challenge

  • WWTW design focusses om peak flows – formula A, full flow to treatment, storm water retention etc but little attention is paid to minimum flows
  • DWF as 20%ile may not reflect base flow as well as was attempted with the previous DWF definition incorporating precedent conditions
  • Prolonged dry spells can result in significant reductions in daily flow below DWF20%
  • This can impact WWTW performance
  • Sewer transport processes may be affected resulting in more severe storm flush events
  • This presentation focusses on those sites where prolonged dry weather result in flows below DWF but is also relevant for prolonged DWF operation

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