Comment by perilunar
6 hours ago
> Reservoir volume in the US is measured in acre-inches.
Never heard of an acre-inch before, and I'd have to get out a calculator to work out how much water that actually is in pints or gallons, or how much it weighs.
The metric equivalent would be a hectare-meter or a hectare-mm. I know a hectare is 100 m x 100 m, so 10,000 m². So I instantly know that a hectare-meter is 10,000 m³ (10 ML, or 10,000 tonnes of fresh water). A hectare-mm is 10 m³ (10 kL). If my 1 ha block gets 1 mm of rain, then that's 10 kL or 10 tonnes of water. So easy i can do it in my head.
> And of course an inch is 2.4cm
2.54 cm.
> Never heard of an acre-inch before
I only know of it because it's a unit used by the US Army Corps of Engineers, who maintain the local reservoir. A buddy of mine's dad worked for them when I was a kid so that lake was my stomping ground.
> 2.54 cm
Oops! You're right! My bad.