0 0 Water level normal
1 1 Water level much below normal
2 2 Water level high, but not overflowing
3 3 Banks overflowing
4 4 Floating ice (more than half)
5 5 Thin ice, complete cover, impassable for persons, 0 - 4 cm thick
6 6 Ice, complete cover, passable for persons, depth unknown
7 7 Ice, complete cover, 5 - 9 cm thick
8 8 Ice, complete cover, 10 - 24 cm thick
9 9 Ice, complete cover, 25 cm or more thick
15 15 Missing value
