Flood data

Stratumly ships two complementary flood-data layers, both rendered on the 2D map:

• EA Flood Risk Zones (flood-zones): static planning polygons.
• EA Flood Warnings (flood-warnings): live operational alerts that refresh automatically.

The pair tells a complete story: zones say what might flood; warnings say what is flooding now.

Show or hide flood layers

1. Open the Layers panel in the map sidebar.
2. Tick or untick Flood zones or Flood warnings.

Read flood warnings

Live flood warnings are coloured by severity:

Severity	Colour	Meaning
Severe Flood Warning	Dark red	Danger to life.
Flood Warning	Red	Flooding is expected; immediate action required.
Flood Alert	Orange	Flooding is possible; be prepared.
Warning No Longer In Force	Grey	Recently de-escalated; kept on the map for around 24 hours.

Click a warning polygon on the map to open the inspector. The inspector shows the severity, the warning area name, and the message text.

Refresh warnings manually

Warnings refresh automatically every 15 minutes. To force an immediate refresh (Owner / Admin only):

1. Open Admin → Flood data.
2. Click Refresh now.

Disable the live layer

If your organisation doesn't need live warnings (for example because you operate outside the UK):

1. Open Admin → Flood data.
2. Toggle Live flood warnings off.

The layer stays empty and the automatic refresh stops.

Combine flood data with your assets

To find which assets are at risk during a live event:

1. Make sure Flood warnings is visible.
2. Open the Spatial analysis panel.
3. Run Intersect on your asset layer (for example pipes) and the flood-warnings layer.
4. The resulting layer shows only assets currently inside an active warning.

You can also buffer your assets first (for example by 50 m) before intersecting to capture nearby risk.

What next?

• Spatial analysis: combine flood data with your asset registers.
• Maps: manage which layers are visible.