Jaws questions :-If it rains will the bloody thing fill up again...

Jaws questions :-

If it rains will the bloody thing fill up again thus restarting the many months clock?

Coal shards and bits potentially blocking gas flow rather than sand or together with sand...… Recently had a totally blocked sink and it was not due to my kitchen efforts at all but due to 50 years of internal rust creating various sized bits of iron within the pipe massing together at a choke point to slowly but surely block the water flow. Now gas trying to escape is under high pressure is likely to pick up various sized coal shards and send them rather quickly to a gven choke point. Maybe something like this happened?

I assume this is not a new potential problem and they already know how to deal with it if so but then again this is a new type of project so maybe not.

Thoughts?