How do I document a leak that appears only while the watering system is running?

Make a short observation report while the symptom is visible, without touching or opening the suspected part. Start with the date, which zone was running, when it started, and roughly when water first appeared. Describe the location using a fixed reference, such as “beside the path, about one step from the valve box,” rather than just “near the lawn.”

Record what you can see: a drip, spray, pooling, or unusually wet patch; its approximate size; and whether it grows, stays the same, or stops. Keep observations separate from guesses. For example, write “water sprayed from the soil beside the edging,” not “a buried pipe is broken.”

If you can safely observe zones separately, note which one was operating when the symptom appeared. University of Minnesota Extension recommends running irrigation zones separately when observing system performance. This can help you record the operating zone and visible symptoms, but its guidance is about auditing irrigation systems, not a leak-reporting protocol or repair. [S1]

Use the zone label shown by the controller and note the transition times you actually observe. Record when that zone began and whether the symptom appeared during startup, steady operation, a zone change, or shutdown.

If it is practical and safe to observe one zone at a time, note which one was running when water appeared. Extension guidance supports observing zones separately, but does not tell you how to isolate a leak or determine its cause. [S1] If the timing is too brief to identify confidently, write “zone uncertain” and record the approximate times rather than guessing.

Describe the location from a stable landmark. Include a nearby system feature only if you can identify it without moving anything. For example: “wet soil on the lawn side of the stone path, about 30 cm from the sprinkler head marked Z2.” If you do not know what a component is, describe what it looks like or leave it out.

Note where water first appeared, where it spread, and whether it formed a puddle or ran across a surface. You can make a simple sketch or take a photo from a safe distance, if appropriate. Label it with the date and zone, and record timing separately. Mark measurements as approximate and distinguish what you saw from what you suspect.

Copy and fill in what you know. Write “unknown” or “not observed” instead of guessing.

Leak observation report Date: [date] Observer: [name or initials, optional] System status: [running / stopped / other] Zone shown or observed: [label / unknown] Zone start time: [time or approximate] Water first noticed: [time or approximate] Water stopped or changed: [time, or still visible] Location from landmark: [plain-language description] Visible symptom: [drip / spray / pooling / wet patch / other] Approximate size or spread: [description] What changed over time: [observation] Photo or sketch reference: [optional label] Uncertainties: [what could not be identified]

Example: “June 12, about 7:10 a.m.; controller showed Z2; water appeared during steady operation beside the path, on the lawn side, about 30 cm from the marked sprinkler head; wet patch grew from roughly a hand-sized area to a small puddle over several minutes; source not identified.” This is an illustrative example, not a diagnosis.

Leave out unsupported claims about the cause. Don’t loosen fittings, dig, or attempt a repair while the system is pressurized. Share what you observed and what remains uncertain with a qualified irrigation professional.