Water from underground pipes often leaks. Particularly, in countries with an antiquated underground waterpipe infrastructure. In the case of Greece, for example, leaks are estimated to constitute up to 50% of total consumption.

Flash floods are very localised weather events. They are mostly triggered by heavy rainfall. Typically, over a period of less than 12 hours. They occur very infrequently at any one place.

We can blame all sorts of things on the weather. But a stomach bug?  It seems unlikely. Yet, scientists say greater quantities of rainfall and bigger storms will lead to more stomach upsets in parts of Europe.