River basin. A reach of a river valley: three gauges on the low ground, a weather station and an edge node. Ground within 6 m of the reach low: 11.28 ha. Gauged reach: 884 m.

A reach of a river valley: three gauges on the low ground, a weather station and an edge node.

01/04

Field environments

River basin

Water-level gauges along a river valley floor, a weather station and an edge node: the red isoline is the ground that lies within a few metres of the lowest point of the reach.

Network scenes here: Microwave backhaul across a river valley

Tour transcript

1. A reach of a river valley: three gauges on the low ground, a weather station and an edge node.
2. Each gauge measures stage; the rating curve turns it into discharge.
3. The red isoline bounds the ground within 6 m of the lowest point of the reach.
4. Alerts leave the edge in the authority’s format; the authority decides and warns.

In this scene

Water-level gauge

Radar level sensor over the channel; stage converts to discharge through the gauge’s rating curve. (ISO 18365, WMO-No. 1044)

Inundation isoline

Computed from the terrain: every cell no higher than the chosen level above the reach low. (OGC WaterML 2.0)

Compute racks

Keeps the gauge records through an outage and releases alerts to the authority’s system. (OASIS CAP 1.2)