They're monitoring more, and better.
The total duration hours of monitored spill events between 2016 and 2020 goes up by a factor of 30, which seems quite extreme.
There has been more monitors installed too, so you'd expect the base rate to climb to a certain extent.
Then it gets more complicated, which is why it's handy to read the accompanying notes in the media that's watching, like the surfer collective and Grauniad.
These VT threads don't slice so easily anymore. In this case because we've got changes from the wonky weather now, plus a shortage of public funds after being robbed and crashed.
We are getting more problem patterns of rain. Existing flood measures are inadequate and are getting overwhelmed more often. Money that would have paid for gradual improvement has been paid out as dividends.
Money for works at regional level to absorb more rain locally, rather than enter the waterways (ie less paving more grass) has been spaffed.
Tory Brexit problems are multiple pile ups now. Clusterfails.