The Fall Check Before You Shut Down: What Your Flow Sensor Can Tell You This Season

A broken pipe, stuck valve, damaged sprinkler head, or slow leak can cause water to flow when it shouldn’t. That’s where an irrigation flow sensor adds another layer of protection. CST flow sensors can work with smart controllers to identify abnormal flow and, depending on the system configuration, trigger the controller to shut down the zone or master valve and send an alert.

What to Look for During Your End-of-Season Irrigation Check

Before completing your irrigation system shutdown, use the remaining weeks of operation to evaluate what your system is telling you.

1. Look for Unusual Flow Patterns

Every irrigation zone has an expected flow range based on its design, sprinkler heads, pressure, and operating conditions. If a zone suddenly uses more water than normal, something may have changed.

An unexpected increase in flow could indicate:

• A broken or damaged underground pipe
• A sprinkler head that has been damaged
• A stuck or malfunctioning zone valve
• A fitting or connection that has developed a leak
• Other changes in the system’s normal operating conditions

A leaking pipe or fitting should be repaired before winterization for two reasons. First, remember that blowing out an irrigation system puts increased stress on the piping system. Air pressure and velocity runs higher than water in the system. This may cause a blow out that will require additional repair to complete the winterization process, requiring unexpected material and labor costs. Second, if the leak is not repaired, it may leave water in the pipeline leading to freeze damage over the winter, requiring more repair cost in the spring.

An unexpected decrease in flow can also be worth investigating. It may indicate clogged components, a zone valve issue, or another condition affecting system performance. Compare current performance with what is normal for that system. Your flow sensor provides the data needed to spot those differences.

2. Check for a Zone That Runs Longer Than Expected

A zone that consistently runs longer than its programmed schedule needs attention. If a controller is telling a zone to run for 20 minutes but flow continues beyond the expected operating period, the problem may not be the controller itself. For example, a valve that fails to close completely can allow water to continue moving after the programmed irrigation cycle ends.

Instead of relying exclusively on visual inspections, a flow sensor can monitor what is actually happening in the water line.

3. Don’t Ignore the Slow Leak

Large irrigation failures are usually easy to notice. Slow leaks are harder to spot.

A small underground leak may not create an obvious puddle or immediately damage the landscape. But, it can gradually waste water and increase operating costs while remaining hidden from view.

Because a flow sensor continuously measures water movement, it can indicate that water is flowing when the system shouldn’t be using it or that a zone’s flow is outside its expected range. Finding that problem in October before the system is winterized is much better than discovering it next spring after the system has been sitting unused for months.

Fix Problems Before Winter, Not After

The best time to discover an irrigation problem is while the system is still operating.

If a flow sensor identifies an abnormal condition in the weeks before shutdown, irrigation managers can investigate the affected zone, locate the source of the problem, make repairs, and confirm that the system is operating normally before winterization. The real value of an end of season irrigation check is about using the final weeks of the irrigation season to verify that the system is healthy before it goes offline. A flow sensor provides essential data for that process.