At the beginning, when Leo first encounters Christine, he diverts her attention using a mechanized sprinkler system. I'm pretty sure they didn't have underground irrigation systems back then. Where my historians at?
Son, you can't polish a turd
I think the Director's comments on the DVD makes some mention of the advancement of this type of engineering in this period of time.
An independent mind is difficult to enslave.
This actually talks about Louis in real life where he constructed water ways for the gardens at Versailles the most incredible. I don't doubt they had something like this. It is basically pressure built up from inflowing water.. so, once turned on, it would be easy to get the pressure out there
shareWatch "A Little Chaos" to learn more about the irrigation and garden design tech of the era:
http://www.imdb.com/title/tt2639254/combined