Value |
Category |
1 |
By sewers |
2 |
Protected canal |
3 |
Opened canal |
4 |
Swallow-hole |
5 |
River |
6 |
Hole |
7 |
Nature |
8 |
Other |
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.