For more help with this issue, see brown patches that signal an irrigation leak, how irrigation leaks are found zone by zone, our emergency leak detection overview, and yard and meter-box leak emergencies.
Burst Main Flooding The Yard
The main line from the supply to the valve manifold runs under constant pressure — when it splits, water pours 24/7 regardless of the controller. Lawns drown, mulch washes away, and the meter spins relentlessly. We shut the supply down and trace the main's exact route to the split.