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We came up with telephone numbers too! I must stress that the flow has not been measured. It was just an Anglian Water engineer giving his guestimate. You can, apparently measure it by timing how long it takes to fill a container and then doing the maths.
But even attempting to measure means that you must ensure that you capture ALL of the outflow as only catching a part of it would give a very false figure. It would be no use holding a bucket in the stream and seeing how long it takes to fill it eg a 10l bucket fills in 10 seconds.....
But if you are only catching 10% of the outflow, then the true figure would be 1 second for 10 litres, if only 1% of the outflow........ and do on.
Anglian Water would seem a very sensible starting point and simply drop a note through the door warning them that you are invoking that procedure to get the flow managed/stopped.
If the flow is greater now than when it started, it could mean the hole has eroded internally from say 6" diameter to 9" or even larger, that may not be visible through the hole.
You started by saying it was an "artesian well" - is it in a dip/valley ? From my knowledge of artesian wells, this was how the Trafalgar Squate fountains were first originally operated as London has a clay basin underneath it and the pressure forced the water up. Nowadays, the artesian flow has virtually stopped as so much water is abstracted for household use that Trafalgar Square is now a closed, pumped system. So your flow will not reduce if it IS artesian, until the basin underneath has been drained...
Has the water been tested to ensure that it is not from a fractured main pipe ? That would be VERY expensive and I suspect AW would be required to sort it at tgeir expense......