thats fucking insane!A bit off-topic but it reminds me that I have to pay a fee/tax here for the rainwater that falls on your property. No shit.
At least only the square meters count which is paved/tarred and has a gully that leads into the public sewer system. Same for all your roofs if they have the same access to the sewers. I know some greedy neighbours who prolonged their rain gutters until they reached open ground somewhere between the bushes to save a few €.
Wasn't always so; they introduced the shit a few decades ago.

