During this monitoring period, the algorithm identified two candidate tension-crack features on the embankment face. Both features (IDs 01–02) exceed the confidence threshold for engineer escalation and are flagged for review. No findings in this report constitute a determination of structural failure — all findings are advisory pending review by a qualified engineer.
| ID | FEATURE | LOCATION | EST. LENGTH | GROWTH RATE | CONFIDENCE | STATUS |
|---|---|---|---|---|---|---|
| 01 | Tension crack | Sector B, sta. 4+20 | 4.2 m | +1.1 m/mo | 0.87 | FLAGGED |
| 02 | Tension crack | Sector B, sta. 4+55 | 2.6 m | +0.5 m/mo | 0.79 | FLAGGED |
Estimated length increased from 3.1 m to 4.2 m over the monitoring period, a growth rate of approximately 1.1 m/mo. Projected forward at the observed rate, the feature is estimated to approach the 5.0 m warning threshold within the next reporting cycle. Continued monitoring recommended at increased frequency.
Imagery was captured via drone photogrammetry by the facility's contracted UAV provider and processed through BlackBox: 39N's image-segmentation model to identify and localize surface features consistent with tension cracking. BlackBox: 39N does not fly drones or acquire imagery — analysis is performed on imagery supplied by the client, at the client's chosen survey cadence. Detected features are scored by confidence and tracked across surveys to assess progression. This method does not replace geotechnical inspection or engineering judgment — it directs attention to where that judgment is most needed.
[ Space for reviewing engineer's assessment, recommended action, and follow-up timeline. ]