Frequency distribution and cumulative frequency

occurrence of values of a phenomenon (e.g: water level) less than a reference value. The phenomenon may be time- or space-dependent
Cumulative frequency is also called frequency of non-exceedance.

often a certain phenomenon (feature) is below a certain value. This may help in describing or explaining a situation in which the phenomenon is involved, or in planning interventions, for example in flood protection.
This statistical technique can be used to see how likely an event like a flood is going to happen again in the future, based on how often it happened in the past. It can be adapted to bring in things like climate change causing wetter winters and drier summers.

There are a couple of main reasons:
You want to check that your math is correct. By adding up all of the numbers and comparing it to your sample size you know you’ve included all your data. For example if your sample size was 44 in this case, you’d know by the cumulative frequency distribution that you’re missing one piece of data.
You’re interested in studying a phenomenon to find out a “more” or “less” question.