I don't understand the description of Tag:seamark:type=lock basin. It seems to be just a copy of https://wiki.openstreetmap.org/wiki/Seamarks/Seamark_Objects. And furthermore there is no "lock basin" in the S 100 catalogue.
Lock basin is in the S-100 & S-57 catalogues. (LOKBSN). It was missing from the Seamark_Objects page, so I have added it.
Please add lock_basin attributes on page https://wiki.openstreetmap.org/wiki/Seamarks/Seamark_Objects#Object_Index. Afterwards I could reference to the attributes from this wiki page. Thanks.