Surface water - Complaint of the neighbors

He does not need to drain, he only needs to unseal the area, that is to dismantle his shed or, like any rational being, if the infiltration area is not sufficient, connect his roof area to the rainwater drainage.

Whereby drainieren also only means to collect the water for a faster runoff and to supply it to the rainwater drainage.

That all sounds just like I imagined. I will ring the neighbors' doorbell in the next few days and discuss it. I will report here then.