Simple flooding level chart card

Who it’s for

City operators and hydrologists monitoring rivers or drainage networks ask “how has the water level changed over time, without the clutter of delta comparisons?” They want to see the current reading and a trend line in one card, nothing more.

What it does

A sensor currently reading 0.8 m shows a color-coded value above a chart that reveals whether the water level has been rising or falling over the selected period.

• Large current water level in the center, color-coded across three severity levels from Normal to Critical
• Time-series chart of water level readings over the selected time window, averaged per interval
• Shows one sensor’s data; it does not compare multiple locations or show period-over-period deltas

How to set up

Data keys

Key	Role	Type	Description
flooding	Chart series	Timeseries	Water level in meters; drives the chart. The Latest value overlay is automatically derived from this same key
Latest	Latest value	Timeseries	The headline figure above the chart. Its own color ranges are where the band colors are edited

The widget ships with a simulated function datasource key labeled Flooding level, so it draws random values until you point the datasource at a device and rename the key.

To point it at your own device: open the dashboard in edit mode, open the widget’s Datasources, pick the entity or entity alias, and replace the function key with the key your device reports.

If the key has never reported for the selected time window, the chart is empty and the value overlay shows no data.

Value ranges

Range (m)	Level	Color
0–1	Normal	Blue
1–3	Warning	Orange
3+	Critical	Red

How to customize

• To use your own flood thresholds — edit the color ranges on the Latest data key; adjust the three default levels to match your local alert levels.
• To change the unit label — set Units to your preferred label (e.g. ft for feet).
• To hide or show the chart — toggle Show chart in the widget settings.
• To change the chart line color — set Chart color.
• To show min, max, or total in the legend instead of avg — edit the Legend settings.
• To hide the entity name subtitle or the timestamp — turn off Show subtitle or Show date.
• To match your dashboard’s fonts — set the font options under each data key’s appearance settings.

Tips

• Use this card when the trend shape matters more than the exact period-over-period change. Add the full flooding level chart card if you need a delta percentage alongside the chart.
• A rising trend in the chart means flood risk is building. Pair this card with a flood alert rule to get notified before the level reaches the Warning threshold.