The ID of the HRU is a primary key referenced by hru in hru.con. All IDs in the hru-data.hru file must be unique.

The SWAT+ Editor assigns a name to every object, which is typically the abbreviation of the object type followed by the object number in QSWAT+. However, the name of the HRU is not used by SWAT+, so the user may change it.

The pointer to the soil and plant initialization file is a foreign key referencing in .

The pointer to the hydrology file is a foreign key referencing in .

The pointer to the field file is a foreign key referencing name in field.fld.

The pointer to the topography file is a foreign key referencing name in topography.hyd.

The pointer to the snow file is a foreign key referencing name in snow.sno.

The pointer to the wetland file is a foreign key referencing name in wetland.wet.

The pointer to the land use and management file is a foreign key referencing in .

The pointer to the soil file is a foreign key referencing name in soils.sol.