What is the depth of the water?
The water is shallow.
    src        edge_attr  dst
0     0               in    5
1     0  to the right of    1
2     1               on    6
3     1   to the left of    0
4     1               in    5
5     2               of    5
6     4   to the left of    8
7     4               in    5
8     6   to the left of    8
9     7               in    5
10    8  to the right of    6
11    8  to the right of    4
12    8               in    5