A few years ago, my sister gave me a jumbo rain gauge. I bring it in during the winter, and I had just put it back outside last week. There is a bright orange float which shows the water level. Here you can see the float sitting at the empty bottom.
When I looked out Monday morning, a little vegetation obscured my view of the orange float, but I could see the gauge above about the 1" mark, so I knew we had less than about 1" at that point.
Tuesday morning after it stopped raining, I glanced out. I knew the float had to be high enough to be visible above the vegetation, but I didn't see it. I went out and took a closer look. No float in sight.
What? You might have guessed--the entire gauge was full of water and the float was resting under the collar of the green funnel at the top.
I can't say how much rain we got, but it's safe to say it was over 5 1/2".
We are in a low-lying area, so our crawl space was flooded, but the good news is that our soil drains very quickly.