Catchment: Derwent

Current state for 2026-04-20.

Catchment alert

1 sensor(s) are in alert state.

Review sensors for likely cause and confidence.

Catchment health score

76 /100
StatusWatch
Alerts1
Watch0
Avg trust1.00
  • 1 sensor alert state(s) are active today.
  • Observed DO % is materially displaced from expected levels across the catchment.



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What this says commercially

Catchment health is currently rated 76/100 (Watch). 1 alert-state sensor(s) and 0 watch-state sensor(s) are active in today's prepared view. The dashboard is identifying a moderate pressure state, useful for demonstrating early warning capability before severe degradation is visible across all sensors.

What this means operationally

DO % is currently below expected at Upstream. Overflow-related risk is currently low, so unexplained local changes would deserve more attention if they emerge. No strong catchment-wide stress signal is present in the prepared indicators for today.

Flow m³/s
—
Rainfall influence mm/last 6h
0.0
Air temperature °C
10.5
Overflow Incidents
0

Current sensor state

Upstream, Midstream and Downstream

Upstream

Alert
108.3%
8-day trend -2.4
Today avg
99.1%
Expected
103.7%
Variance
-4.6
vs yesterday-3.1
vs last week-2.4
vs last month—
vs last year-6.1
Water temp8.6°C
Trust1.00

Anomaly likely cause: uncertain · confidence 0.45

Midstream

No data
—%
8-day trend -14.2
Today avg
—%
Expected
—%
Variance
—
vs yesterday—
vs last week—
vs last month—
vs last year—
Water temp—°C
Trust—

Downstream

No data
—%
8-day trend +2.6
Today avg
—%
Expected
—%
Variance
—
vs yesterday—
vs last week—
vs last month—
vs last year—
Water temp—°C
Trust—

Overflow: Low risk

0 /100
Rain 6h max0.0
Overflow overlap0
Flow latest—
  • No strong overflow-linked drivers are active.

Alerts

Storm-overflow-linked anomalies

No storm overflow anomalies are likely today.

Main view

Observed vs expected today

Influencing factors

Flow, weather and overflow context

Catchment interpretation

What a user would likely ask first

  • No strong catchment-wide stress signal is present in the prepared indicators for today.

Calendar-accurate comparisons

Comparison dates used

Yesterday19 Apr 2026
Last week13 Apr 2026
Last month20 Mar 2026
Last year20 Apr 2025