Quote:
The circles are approximately 20-30 feet in diameter, some are larger at approximately 30-60 feet in diameter.
The circles appear to be eroded from areas where water once flowed and the areas appear to contain no large trees or large bushes from the high resolution 1 meter images provided by Google Earth.
20-30 feet is about right. That's from the never-ending wind blowing around the sides of these mounds that the bushes set on. The bush itself can be up to 10 or 12 feet wide & maybe 4 feet tall.
Notice the "dots" in the middle of each circle in your irrigation area....which is actually sand dunes. 
Truth is stranger than fiction.
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