OpenStreetMap is not intended to be used to map fantasy project. Please tell your classroom to cease using OpenStreetMap for its dam projects. 

The edits that have been peformed by your group in this area have been destructive as they were of very low quality and did not align with reality.

Furthermore the notes left behind in this area have been nothing but meaningless spam. Notes are intended to give feedback to other mappers about missing or outdated features. They are not intended to be used for classroom projects.