A typical center-pivot is a quarter-mile long so as it rotates it can irrigate a circle a half mile wide (so 4 of these size pivots can fill the main part of a section of township-and-range surveyed land). There are some that have a half mile arm so the circle is a mile across (but have bigger corners). I have a nice image at work that I'll post tomorrow that has both sizes in action. Actually quite artistic in the summer from space in an semi-arid region with only grass around otherwise...
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