On 01/05/2021 16:45, polygonum_on_google wrote:
On Saturday, 1 May 2021 at 15:26:58 UTC+1, newshound wrote:

There is a trade-off. How much money do you spend on sensors. How much
time and effort on direct and remote inspection.

As another poster pointed out, it is a developing problem with people
flushing so-called flushable wet wipes, etc. There are also more city
centre restaurants and take-aways, although I have the impression that
much more effort now goes into preventing fats from entering sewers from
these sources

Certainly, while people put wet wipes, etc., down, there will continue to be a problem.

But the costs of removal can be huge - just had a look around and saw one 10 tonner cost £400,000 to remove and fix. And costs in millions for others.

It simply cannot cost anything like that much to have a look every week with a camera. Though a fully automated system could cost a bit to install.

I disagree. That's a cost for what total length of sewers? And a
comparatively infrequent event? An inspection, whether by camera or
direct man access is going to require a minimum of two people, almost
certainly more. Add in the equipment, infrastructure, and overheads cost
it's a minimum of £1000 a day. I doubt if you would inspect 100 yards a day.