|man_made = water_tank|
|Using this tag is discouraged, use man_made=storage_tank + content=water instead.|
|Used on these elements|
|Tools for this tag|
|This feature has been labeled as deprecated. The recommended replacement is: man_made=storage_tank + content=water. You are still free to continue to use or interpret this tag as you see fit since OpenStreetMap does not have "banned features".
Under no circumstances should you (semi-)automatically change "deprecated" tags to something else in the database on a large scale without conforming to the Automated Edits code of conduct.