Table Name: COD_DH
Group: BIT (Basic Information Tables)
Type: Reference table. A dictionary used to standardise and interpret the meaning of numeric values in the River Basin Districts field (Record Basic Data table).
General Description:
This table serves as a controlled vocabulary to clarify the nature of numeric values found in the River Basin Districts field. It ensures consistency in geographic classification across all database entries.

Fields:
- CodeDH (River Basin Districts Code): Numeric code uniquely identifying each Spanish municipality.
- HDName (River Basin District Name): Official name of the River Basin District.

Controlled Vocabulary:
CodeDH	HDName		
20	DUERO
30	TAJO
91	EBRO
70	SEGURA
100	CUENCAS INTERNAS DE CATALUÑA
80	JÚCAR
0	INTERNACIONAL
125	LA PALMA
50	GUADALQUIVIR
18	CANTÁBRICO OCCIDENTAL
60	CUENCAS MEDITERRÁNEAS ANDALUZAS

Relationships:
- Used in the Record Basic Data table.
