QE1

Biological quality elements

QE12

Ecology: Biological Elements + Hydromorphological Elements

QE123

All quality element types

QE13

Biological Elements + Chemical and Phys.-chem. Elements

QE2

Hydromorphological Quality Elements

QE23

Hydromorphological Elements + Chemical and Phys.-chem. Elements

QE3

Chemical and physico-chemical quality elements (e.g. those indicated in WFD, Annex V)