# Alert When a Dam Level Drops Too Low (https://logable.app/use-cases/dam-low-level)

Get an alert when a dam drops to a quarter of its full supply level, so you can stop irrigating or start pumping the same day.

## Equipment
One dam, with an ultrasonic sensor on the wall and a 4G router carrying the reading out.
- **Dam** level · distance

## The reading
- **Metric:** level (%)
- **Source:** the ultrasonic sensor on the dam wall
- **Cadence:** every minute

## The problem
Settling Dam drops to 23 percent over a dry week while the pumps keep drawing. The first sign anyone gets is a pump running on air.

## The alert
**Low water level** (warning)
low on water
Fires at 25% of full supply level. It needs four matching readings before it fires or clears, because dam sensors are noisier than most. A single odd reading can't trigger a false alert or a false all-clear.
Add it from the dam's Triggers tab. The 25 percent it fires at is a general default rather than a number tuned to how your dam is run, so change it once you know your own working range.

## The response
- **Sent by:** push, email and the in-app inbox
- **Who is told:** the rule's recipients
- **What happens:** The farmer stops irrigating, or starts pumping to refill.
- **Stops when:** somebody acknowledges

## On your dashboard
The Logable device page for a settling dam, showing live level and its history

## Frequently asked questions

### How do I get an alert when a dam level drops too low?
Open the dam's Triggers tab, select Browse presets, and add Low water level. Set the dam's shape and full supply capacity on the device first, so the level and the stored volume both read correctly.

### What level does the dam low water alert fire at?
Twenty five percent of full supply level, and it clears at 40 percent. That threshold is a general default and not tuned to how your dam is normally run, so treat it as a starting point.

### Who gets told when a dam is low, and what stops the reminders?
The rule's recipients, by push, email and the in-app inbox. It waits for four matching readings before it fires, so a single odd reading cannot raise it. Acknowledging stops the reminders.

## Related
- [Dam level monitoring](https://logable.app/solutions/dam-monitoring)
- [the dam device type reference](https://logable.app/docs/reference/device-types/dam)

## Put this alert on your own dam
Connect the level sensor through a 4G router, set the shape and capacity, and add the preset.