start_dates flood_lengths
1  2011-10-09 23:45          5813
2  2011-12-11 22:15           753
3  2012-06-28 11:15           226
4  2012-10-27 00:00           753
5  2012-11-16 03:00          1274
6  2013-05-06 07:15           108
7  2013-05-07 11:45             5
8  2013-09-20 23:45           140
9  2013-09-22 11:00             5
10 2013-09-22 12:30             2
11 2013-09-22 15:00           187
12 2013-09-24 14:00             2
13 2013-09-24 18:15          3046
14 2014-08-25 15:45             1
15 2014-08-25 16:15         13439
16 2015-01-23 21:00           196
17 2015-09-16 03:15          4524
18 2015-11-10 05:30           250
19 2015-11-26 13:45             1
20 2015-11-26 14:45             3
21 2015-11-26 15:45             1
22 2015-11-26 16:45             7
23 2015-11-27 01:45           223
24 2015-12-05 08:45           648
25 2016-10-06 16:45          4859
26 2017-09-08 17:45         10378