It wouldn't work with existing systems. For example, out here in the West, center pivot irrigation is the most common. In a quarter mile crop circle, the arm

It wouldn't work with existing systems. For example, out here in the West, center pivot irrigation is the most common. In a quarter mile crop circle, the arm takes a full 24 hour day to make a full rotation. The bigger 1 mile circles typically take a few days. This is too slow to rescue most crops from a long stretch of 110 degree days. EDIT: Nope! I'm mistaken. I found a newsletter in my inbox from earlier this year saying that there are companies doing exactly what you propose: making high speed irrigation systems for cooling. Here's an example: https://www.agriculture.com/machinery/irrigation-equipment/high-speed-pivots https://www.agriculture.com/machinery/irrigation-equipment/h...