Something that may be of interest, but certainly nothing new and given the current water flows (and temperatures)!!, The time period of discharge however doesn't mean much with without a reading of the volume released. This further demonstrates that the system is not coping, (nothing new there either). Does this raise suspisions that it couyld be covering problems when they would be very difficult to assess? Please remember to report any manhole discharge instances which would indicate hydraulic overload.
The link to the full Thames Water article is below:
https://www.thameswater.co.uk/about-us/performance/river-health