CAM-173

Someone down in the channel

A concrete-lined channel in the middle of town, the water already up and running brown. Someone has climbed down the ledge in the wall and is standing on the last step, one hand on the stone, the water breaking over their feet. Up on the parapet, other people are watching. Downstream, the bridge. IRIS sees that there’s someone down in the channel and how high the water reaches on the steps; it doesn’t know who they are.

CAM-173 · CHANNEL BED · PERSON IN THE BED

What IRIS understands

What it recognizes in this scene

person in the channel
way down into the channel
water up and running brown
people on the parapet
bridge downstream

What this camera measures

An alert says something’s happening. The reading says how much.

1People in the channel
2 min 10 sDown there for
3 / 5Steps of the way down covered
+35 cmRisen in the last hour
4Watching from the parapet
18:42Time of the alert

The figures on this screen are an example from the illustration, not any client’s measurement.

The rule

You decide once. IRIS applies it always.

somebody crosses the parapet and enters the channel, whatever the water is doing

Then

alert the duty officer with the camera, the exact spot and the video of the moment
say how high the water is standing on the steps of the way down
keep the alert open until a person closes it by hand

The instruction that set it up«Tell me the moment somebody is down in the channel, and tell me before they reach the water, not once they are already in it.»

What changes

What changes for whoever answers for the site

Nobody climbs down into a channel expecting anything to happen to them. You go down for a ball, for a photo, or because you have gone down there all your life and nothing has ever happened. What you can’t see from up top is that a lined channel comes up fast and offers no way out: the way down is the only way back. Today that camera is on a screen almost nobody watches, and what’s happening down there’s found out when somebody phones in. With IRIS the alert arrives while that person is still standing on the ledge, with the camera, the spot and the video. The person on duty decides whether to use the PA, send a patrol or close the access. IRIS doesn’t go down and pull anyone out: all it does is make that decision possible sooner.

What people usually ask

Does IRIS know the water is about to rise?

No. IRIS doesn’t forecast floods, and it shouldn’t be asked to: that’s the job of a hydrological system with its sensors across the catchment. What this camera sees is far simpler and is happening right here, right now: there’s a person in the channel, and the water is above the third step of the way down. Both of those are visible in the image. Neither of them is a forecast.

Does it identify whoever has climbed down?

No. IRIS does not identify anyone: it does not recognize faces, it does not read license plates and it does not store who anybody is. It detects that there’s a person where the authority in charge of the channel has said there shouldn’t be one, and that doesn’t require knowing their name. The alert says what’s happening and where, never who.

What if it’s a worker who is supposed to be down there?

Then the rule is written differently, and it is written by the authority in charge of the channel, not by IRIS. You can set working windows, a specific reach, or the days of a scheduled clean-up, and under those conditions the alert doesn’t fire. What you can’t do is leave the rule so wide open that it never fires: an alert that never sounds protects nobody.

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