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Interesting. In isolation, making the end of the hose smaller with your thumb should not matter (the flow rate should be the same). In practice, it does, because using the thumb affects the flow rate of the system. You'll also learn info on pipe engineering.
https://practical.engineering/blog/2026/5/5/the-physics-behind-the-thumb-trick

[Note that this article is a transcript of the video embedded above.] Have you ever filled a bucket with water from the garden hose? It’s kind of a slow process. Or at least it feels slow while you’re standing there waiting. If you played with a garden hose at all, you know the trick of putting yo