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DMA Design and Monitoring

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Module 5_DMA Design & Monitoring_Step Testing Execution

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1. Which condition must be confirmed before starting a step test?
The DMA boundary and meter are valid, and the operating window is safe. A high-priority search corridor exists, even if the DMA boundary is uncertain. The team can close valves without a restoration plan.
2. What makes flow and pressure data reliable for interpreting valve operations?
All loggers, field phones, and valve-operation records use the same synchronized time base. Only the inlet flow logger needs correct time because pressure can be adjusted later. Long sampling intervals are preferred because they smooth every hydraulic change.
3. Why is the number of valve turns alone insufficient to confirm a successful isolation?
Turns show operability but do not prove that the valve is seated tightly or in the expected final state. Valve turns are unrelated to valve position or operability. Only pressure logger readings can identify whether the correct valve was operated.
4. Which combination best describes a real step-test response?
The change matches the valve timing, remains stable, exceeds uncertainty, and makes hydraulic sense. Any large single-point flow drop recorded after midnight. A noisy flow change that occurs before the recorded valve operation.
5. After a valve closure produces the largest sustained unexplained drop while pressure remains stable, what should the team do?
Treat the associated section as the priority zone, verify customer use, and deploy a leak survey. Declare the valve as the exact leak location and begin repair immediately. Leave the valves closed until the DMA inlet flow reaches zero.