But what were the grapes being produced for? Grapes for the table? Grapes for grapejuice? Grapes for industrial alcohol? Grapes for eau-de-vie?piping that led up to a tap...all round the roots of the vines - if that wasn't for water what was it for?...
The rules about irrigation are in place and are strictly enforced!
It is always possible that the rules of an individual classification of Vin de Table, Vin de Pays, VDQS or AOC permit irrigation but I don't know of any.
Open cheating as you describe, if cheating it was, does not go unnoticed or unpunished and the penalties are severe.
Regards
Alan