The Upper Reservoir survey office has posted two depth marks side by side after older surveyors challenged the measurement used in a proposal to hold more water. The first mark was taken before the spillway lip was cleared; the later reading came after the maintenance walk was reopened.
Water surveyor Pera Durn said the pair answers a question about timing, not capacity. A higher mark after clearing may reflect the changed spillway, but the figures do not show how much reserve the west face can hold without water reaching the lower maintenance path.
The schedule now lists the date and condition beside each mark. The proposal to retain a larger reserve has not been approved, and no household release turn has changed. Durn asked ward keepers to use the dated pair when they compare cistern levels rather than carrying forward a single high-water number.
For the office, the next check is the spillway at a lower flow. For residents downstream, the more immediate question is whether a measured release reaches the last cisterns at the time listed on the board. The new posting makes the first part easier to check; it does not yet answer the second.
