A draft schema exists at [SAWGraph Hydrology Ontologies @ Lucid Chart](https://lucid.app/lucidchart/0cb5df71-5275-420b-918d-d4c91ab286e1/edit?viewport_loc=-1413%2C-636%2C4039%2C1876%2CYWR9Suv70T-o&invitationId=inv_e30181f2-c3b4-4d1e-9d7a-200a7299d025). It needs to be vetted and developed as an ontology.
A draft schema exists at SAWGraph Hydrology Ontologies @ Lucid Chart. It needs to be vetted and developed as an ontology.