I was checking out a site called Circle of Blue today and came across a really clever plug-in for Google Earth. If you are a user of Google Earth, just follow the link above and look for "Click here to download the module". If you don't have Google Earth installed on your computer you will have to do that first.
What they have done is linked the data collected every 5 years by the U.S. Geological Survey on total water use in each state of the U.S. What you are actually seeing when you look at the data in Google Earth is average daily use of all water for each state compiled in 2000. These data sets compiled by USGS are really useful - I've used them for some of my research - but some of the data is a little inconsistent.
I sometimes forget how cool Google Earth is, but it is truly an amazing resource.
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