Reference HUCs need to account for renumberings and redelineations, especially those that occurred during NHDPlusHR development and harmonization with Canada.

[ksonda]

Depending on the case this may involve

A) adding PIDs and geometries for HUCs whose numbers have simply been superseded, along with a supercession link to the current correct HUC

B) incorporation of a cross walk of HUCs from the current/final WBD to all previous versions in the metadata landing content at reference.geoconnex.us/collections/huXX