Camera or drone video can help identify center pivot sprinkler repairs

Before you put the pivot away for the season, use a camera or drone video of pivot water patterns and pipe leaks to greatly help winter irrigation repairs.

Drone over an irrigator
A drone flies over an irrigator. Photo by Eric Anderson, MSU Extension.

Imagine being a repairman sent to weld a patch on a leaky center pivot span in the middle of the winter. Think of how helpful the photo or a video of the water application and the leaks would be in helping you determine the location of the needed repair. Even the off-season task of changing out faulty sprinklers can be greatly reduced if you have video of the sprinkler application patterns from last summer to guide you to the location.

Many crop consultants have drone services available to video fields and equipment. Drones are becoming more common among irrigation and crop supply businesses. Once irrigators have seen drone video of an irrigation system applying water, drone services will likely be more in demand. The drone flies a path 40-50 feet above and parallel to the pivot from the center point to the end gun. A two- to three-minute video documents each sprinkler’s water pattern problems and visible leaks for later repair.

Irrigator with a leak
Snap a photo of leaks in need of repair while system is running to allow better communication to repairmen. Photo by Lyndon Kelley, MSU Extension.

Preparing for an Aug. 16, 2019, field day near Sturgis, Michigan, staff from Michigan State University Extension and Purdue Extension performed a system uniformity can test on a 1,300-foot pivot. At the same time, a drone captured video images of the application. The concept is that taking a quick video of the pivot while applying water would allow a producer to identify needed repairs.

Our example video showed a 1,300-foot pivot with one plugged sprinkler at the beginning that could be seen visually from the ground and corrected before the can test and the next drone flight. Three sprinklers were identified by the drone video that spun much faster than the others did, resulting in a smaller whipping application rather than the larger throwing pattern the sprinkler is designed to produce. Our drone flight was videoed by John Scott, Purdue Extension digital agriculture coordinator, and Eric Anderson, MSU Extension field crop educator. You can view the video below.

After viewing footage from the summer evaluation of a seven tower pivot several times, we wished we had numbered the top of the tower boxes with a hog marker or tied marker ribbons to the spans to avoid having to restart the video over again to count the tower from the center point when documenting needed repairs. Scott found that by filming from above and to the side of the pivot, and aiming slightly ahead, the drone provided the best view of the water spray pattern. Determining the best altitude and position to fly and the best angle to video is a matter of trial and error and will depend on factors such as quality of the camera, crop, stage of growth, time of day and degree of cloud cover.

Drone images of irrigators
Finding the right angle is a matter of trial and error and will depend on factors such as crop, stage of growth, time of day and degree of cloud cover. Photos by John Scott, Purdue Extension.

Identifying the needed repair areas of the application is the challenge. The repairs to our example pivot were simple and inexpensive: new caps for the damaged Nelsen 3000 sprinklers were purchased using the sprinkler chart to identify the correct parts. A trip to the local dealer and 10 minutes of student help climbing spans to replace the sprinkler tops corrected the problems. The sprinklers on our tested pivot contain a small resistance pump in the cap to regulate the spin of the deflector plate that creates the desired spray pattern. When these wear out, the plate rotates much faster, creating a whipping effect and a much smaller throw. Three of the 131 sprinklers in the sprinkler package were replaced; replacing all of the parts is recommended when the accumulated number of malfunctioning parts reaches 10%. Almost all sprinkler types will have a wear point that will need attention during their useable lifespan of seven to 10 years.

The irrigation system chosen for the study had its water supply flow tested to assure that the sprinkler design was matched to water supply. Photos and video provide easy identification of differences between a given sprinkler and those adjacent to it. Pivots that have inadequate water supply flow for the sprinkler pattern will have a slowly decreasing application as you move from the center of the pivot length to the end gun that will not be readily visible from photos or video.

There are common problems that greatly reduce water application uniformity from center pivots that our photos and drone video did not identify but our can test did. The drone footage did not capture the over application area between the interface of an end gun and the sprinkler package identified by the catch can test. It did a good job of identifying sprinklers out of sequence when we switched sprinklers, causing a double and half application mistake area.

Can catch test results
Conducting a catch can test can highlight sprinkler heads that are performing outside a range of tolerance, which is generally ±5–8% of the average volume.

A local pivot technician looking at the flight video said the video would be the perfect method to document what leaks and flanges need repaired on a unit. It would eliminate their having to turn the water on to identify leaks when they first get to a site. A video from the ground would also work but would be much harder to get in the middle of the season with stanirding crops in the field. Whether taken from the ground or drone, a video sent to the repairman can be a huge benefit to identifying sprinkler problems.


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