THE VIDEO SHELF · flood risk statistics
The 100 Year Flood Is Not What You Think It Is (Maybe)
Practical Engineering explains what a 100-year flood actually means, combining statistics, hydrology and how society treats risk. Grady walks through local drainage infrastructure and the caveats in estimating flood probability.
Why HN readers recommended it
HN points to it as a clear explanation of what flood return periods really mean.
This is a summary from the source dataset, not an endorsement by Hacker News or the video creator.
Video & recommendation details
- Creator / channel
- Practical Engineering
- Topic
- flood risk statistics
- Format
- explainer
- Level
- general
- HN recommenders in dataset
- 2
- HN mentions in dataset
- 5
- Recommendation years in dataset
- 2017–2025
These counts and years describe the included Hacker News records; they are not YouTube views or the video’s publication date.
From the original HN conversations
Excerpts from the recorded comments. Follow each source for the full comment and surrounding discussion.
Even that is a little misleading (given how bad our intuition about statistics is). A '100 year flood' is flood that has a 1% chance of occurring in any given year (it's independent of what happened 1, 5, or 50 years ago). Calling it a …
JshWright on Hacker News · 2017-08
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Balgair on Hacker News · 2019-05
In Making Nuclear Energy Smaller, Cheaper And Safer
Summaries, classifications and recommendation records are from the HackerTube source dataset. Read about this library and its limitations.