You will need a procedure at the latest when someone comes to inspect and demands it, I have experience with that.
We paved the part towards the street at the previous house in such a way that a kind of wider channel was created and it was sloped towards a flower bed. That was enough for the water authorities from the city.
The 6x6m parking space of the neighbors, which was paved without drainage and not permeable, was not objected to.
One house further, a drainage channel had to be retrofitted for a 1 x 3m area and the connection to the infiltration basin had to be demonstrated.
The rule was clear, the enforcement random.
If you want peace: just ask.