Message posted by JimK on April 15, 2005 at 17:18:45 PST:
A close up of one of the green circles showing the irrigation machinery can be seen here in a picture of a grass farm near the Denver International Airport. The machine is essentially a big pipe anchored at one end that goes around in a circle on big wheels. They move pretty slowly. If you fly anywhere over the western US you will see these things. Sometimes you see only a quarter circle or half circle.
Attached link: here
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