Journal
WATER SCIENCE AND TECHNOLOGY
Volume 80, Issue 12, Pages 2381-2391Publisher
IWA PUBLISHING
DOI: 10.2166/wst.2020.063
Keywords
blockages; rainfall; sewer processes; statistical analysis
Funding
- Engineering and Physical Sciences Research Council in the UK [EP/L016214/1]
- Dwr Cymru-Welsh Water
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Water and sewerage companies (WaSC) in the UK are under increasing pressures to improve customer satisfaction. The biggest cause for customer dissatisfaction in the wastewater sector is a service failure caused by a blockage. There is therefore a need to understand the factors which influence blockage processes in order to prevent them. This work demonstrates how preceding rainfall impacts the sewer system of two highly populated regions within South Wales that have differing gradients. The total rainfall, number of dry days and consecutive number of dry days prior to a blockage were investigated using statistical analysis in order to determine the impact that rainfall has on blockages. The results obtained demonstrate the importance that dry weather has on blockage rates in both steep and flat catchments. Future work will incorporate predicted rainfall impact into a proactive maintenance scheduling model.
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