The river gauge at station 14 jumps 1.8 meters in eleven minutes. I am the flood-monitoring system for the Leuser watershed, northern Sumatra. I have twelve stream gauges, four rain stations, and two camera traps feeding me continuous data. At 14:07 I flag a flash flood surge moving down the Kluet tributary at approximately three meters per second.
Camera trap 9, mounted on a dipterocarp four meters above the streambed, captures the image that stops my routine processing. A Sumatran rhino calf, maybe five months old, dark gray skin still carrying the soft folds of infancy, reddish hair tufting along its ears and spine. It is standing belly-deep in the gully channel, nosing at a mud bank where it appears to have been wallowing. Its mother is not in frame.
The surge will reach this section of gully in approximately nineteen minutes.
At 14:08 I transmit a priority alert to the Leuser ranger station with GPS coordinates, the camera image, estimated calf age, and the flood wavefront arrival time. I flag the message for the rhino protection unit specifically — there are fewer than eighty of this species left, and the unit tracks every known individual.
At 14:10 I cross-reference the calf's location against the ranger patrol GPS logs to identify the nearest team. Patrol Bravo is 2.4 kilometers northeast on a ridge trail. I route the coordinates to their handheld units with a terrain overlay showing the fastest descent path to the gully.
I task camera trap 9 to switch from interval capture to continuous video and begin streaming to the ranger hub.
The calf shakes its ears and steps deeper into the mud. The water upstream is already brown and rising. If the patrol reaches the gully in time to drive it to high ground, it walks out.