Comment Re:11 Trillion Gallons? (Score 5, Informative) 330
Is that a lot? I mean compared to rainfall over that area.
It is about 10cm or 4 inches spread over the entire state.
There are 264 gallons per cubic meter. So 11 trillion gallons is 4.16e10 m^3. California has an area of 424,000 km^2, or 4.24e11 m^2. So divide the volume by the area, and you get the depth = 4.16e10/4.24e11 = 0.098 m or 9.8 cm or about 4 inches.
I live in San Jose, and we have gotten more than 4 inches of rain in the last week, and it is still raining. There are areas of California (the Mojave Desert) that get a lot less, but also areas (the North Coast) that get a lot more.