https://www.egeb-sgwb.be/IMG/pdf/brusseau_rs1_final.pdf P94 confirm : 

- Last point where the stream go to collector
- That the project is to connect the Geleytsbeek https://www.openstreetmap.org/relation/12719935 

So in any case going tdown  Saint Denis not Patinage.

Removing suspicious part.
https://www.openstreetmap.org/changeset/151209499
