We entered Rampgill level one Winter's day, after some 4-6 inches of snow, had fallen in the previous two days.(This was about 20 years ago).
it was raining hard and obviously a thaw had commenced.
On our way out, from about the Scaleburn junction, the water was already up to my knees and getting deeper!
Just before the partial blockage it was up to my waist, but to my surprise the water height did not vary much down the level and continued at about knee height accross the yard.
I have never seen anything like it or since. In part I put this down to improved yard drainage which took place when the visitor centre was set up.
In any case, clearly under exceptional weather conditions an awful lot of water can come down Rampgill level.
I do not think it indicates any blockages or falls, just bad rain storms.