System-Wide Low Sprinkler Pressure: Valve Position and Flow Restriction Checks

5 Zones, 5 Heads Each; First Zone Very Low, Others Poor; 65 PSI Before/After Backflow

1. Confirm all isolation valves (ball/gate) on the irrigation main are fully open.
2. Do a bucket flow test: time a 5‑gal bucket fill from a ¾″ line to get GPM.
3. Check for debris in the water meter or backflow preventer restricting flow.