Application of hydraulic modelling and quantitative microbial risk assessment (QMRA) for cloudburst management in cities with combined sewer systems

• DOI: 10.2166/wst.2023.239
• Publication Date: 2023-07-27T13:52:30Z
• Authors: Claus Jørgensen; Nina D. Sto. Domingo; Berislav Tomicic; Morten E. Jørgensen; Lisbeth Truelstru...; Heidi Huus Petersen; Jes Clauson-Kaas
• Keywords: Sanitary sewer; Rainwater Harvesting; Transfer station

Abstract Urban cloudburst management may include the intentional temporary storage of flood water in green recreational areas. In cities with combined sewers, this will expose population visiting area to sewage and increase risk diarrhoeal disease. We present a unique approach estimate disease after urban flooding. The exposure scenario was: rainwater mixed flows into park; pathogens deposit on grass; discharge, baby plays grass is exposed deposited by hand-to-mouth transfer. work included modelling transport four parks intended be flooded during future cloudbursts. A simulation experiment was conducted deposition from transfer hand. Hand-to-mouth transfer, based literature values, used ingested dose pathogens. probability illness estimated QMRA. average varied between 0.03 17%. If considered unacceptable, plans should changed, or interventions, e.g. informing public about restricting access area, implemented.