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DMA Design and Monitoring

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Module 1_ DMA Design & monitoring_ DMA Concepts

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1. Which description best matches a valid District Metered Area (DMA)?
An area defined only by customer billing addresses. A network area with a pressure logger, regardless of unmeasured connections. An area drawn in GIS with an inlet meter, regardless of boundary status. A field-verified network area with controlled boundaries, where all water transfers and storage changes are measured or accounted for.
2. GIS shows a DMA boundary valve as closed, but its actual position has not been verified. What should the team do before relying on the monitoring data?
Accept the GIS information because the valve is marked as closed. Confirm the valve’s actual position and operability in the field. Assume the valve is closed when inlet flow appears stable. Ignore the valve unless a visible leak is found nearby.
3. A proposed DMA meter can measure peak flow, but its low-flow capability has not been checked. What is the correct action?
Accept it because accurate peak-flow measurement guarantees accurate low-flow measurement. Accept it as long as its connection size matches the pipe diameter. Check its suitability for minimum and peak flows, and bidirectional flow where required. Replace low-flow readings with the daily average.
4. What must be in place before carrying out a controlled DMA boundary or connectivity test?
Utility authorisation, an approved procedure and agreed controls to protect supply, including critical customers. Approval from the survey team alone, provided the test is short. A completed GIS drawing, without operational approval. Evidence of high night flow, which removes the need for further authorisation.
5. A zone has one bulk inlet meter, two normally open interconnections shown only on an old drawing, and high minimum night flow. What is the correct conclusion?
The high night flow confirms leakage because the zone has an inlet meter. All measured night flow can immediately be reported as recoverable leakage. The old drawing is sufficient evidence that all water transfers are understood. The high flow triggers investigation; the boundaries, flow paths, metering and operating configuration must be validated before concluding that it represents leakage.