Hi,

Why do you say that it is a water area and not a wetland ?
Do you know what is a waterway relation ? See https://wiki.openstreetmap.org/wiki/RU:%D0%9E%D1%82%D0%BD%D0%BE%D1%88%D0%B5%D0%BD%D0%B8%D1%8F_-_%D0%92%D0%BE%D0%B4%D0%BD%D1%8B%D0%B5_%D0%BF%D0%BE%D1%82%D0%BE%D0%BA%D0%B8 if needed.
Several watercourses + water areas + wetland areas mean that your relation 1445773 is not a waterway relation.
I suggest you to change it into a watershed.

Best regards