https://geodata.environnement.brussels/client/view/030319b5-9197-44b7-b675-1e0ca9e90bb2 give multiple source on the north part ; https://www.mapillary.com/app/?pKey=319351867924979 can view the wetland forming by theses sources (and visible on latest imagery)

theses spring can be accessed : https://www.mapillary.com/app/?pKey=1223272929049265

Add also the source inside the allotement.

Final changeset and we can close these note : https://www.openstreetmap.org/changeset/151208458