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Central pivot irrigation is a form of overhead (sprinkler) irrigation consisting of several segments of pipe (usually galvanized steel or aluminium) joined together and supported by trusses, mounted on wheeled towers with sprinklers positioned along its length. The system moves in a circular pattern and is fed with water from the pivot point at the center of the circle. The outside set of wheels sets the master pace for the rotation (typically once every three days). The inner sets of wheels are mounted at hubs between two segments and use angle sensors to detect when the bend at the joint exceeds a certain threshold, and thus, the wheels should be rotated to keep the segments aligned. Centre pivots are typically less than 500m in length (circle radius) with the most common size being the standard 1/4 mile machine (400 m). In order to achieve uniform application centre pivots require a continuously variable emitter flow rate across the radius of the machine. Nozzle sizes are smallest at in the inner spans to achieve low flow rates and increase with distance from the pivot point.
Originally posted by Anonymous ATS
Ok - A few things to note.
1.) I'm sorry but the 'planes' seem to be doctored in the google map view. Not even JFK has that many planes just sitting there -- and none taking off or landing? What, this was everyone on vacation?! To supply that many planes, I would imagine there would have to be a very large fuel depot -- nothing.