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Aa – Discharge

Aa is measured at 1 measuring station and touches Lake Pfäffikon.

Current situation

Aa at Stegen-Wetzikon (outflow) is currently flowing at 0.0 m³/s. Compared with yesterday’s daily average (Coordinated Universal Time, UTC): largely stable; currently below the 30-day median.

Discharge0.0 m³/s

Reference: 30 available daily means from the last 30 complete days (Coordinated Universal Time, UTC), compared with the current individual value. Being close to the median does not describe the spread of values. Gaps can affect daily means. This is neither a seasonal normal nor an official danger level.

How this assessment is made

Reading and sourceKanton Zürich (AWEL) – HydroPro · 7 minutes ago

Basis of comparisonCurrent reading, previous day and available 30-day daily means from the same reference station.

CalculationSeepegel uses the highest-flowing current reference station; stations along a river are not added together.

Aa, Stegen-Wetzikon (outflow)

Outflow from the lake: this value describes the outflow station.

Abfluss des Pfäffikersees Richtung Greifensee, Kanton Zürich AWEL, Station ZH 525

Measurement time: Oct 4, 2026, 3:30 AM

Kanton Zürich (AWEL) – HydroPro ↗

Discharge over the last 30 days

One line per station. Differences are not a direct inflow balance: measurement times, travel times, storage, withdrawals and tributaries can affect the values.

Stegen-Wetzikon (Abfluss)

What has changed?

3 hours ago

↓Aa, Stegen-Wetzikon (outflow): reading fell by 0.0 m³/s

2 days ago

↓Aa, Stegen-Wetzikon (outflow): reading fell by -0.6 m³/s

3 days ago

↑Aa, Stegen-Wetzikon (outflow): reading rose by +0.4 m³/s

4 days ago

↓Aa, Stegen-Wetzikon (outflow): reading fell by -0.4 m³/s

5 days ago

↓Aa, Stegen-Wetzikon (outflow): reading fell by -0.3 m³/s

6 days ago

↑Aa, Stegen-Wetzikon (outflow): reading rose by +0.6 m³/s

Readings and stations

All recorded quantities with measurement time, data quality and official source.

Discharge

Stegen-Wetzikon (outflow)Kanton Zürich (AWEL) – HydroPro0.0 m³/sMeasured7 minutes ago

Stations on the map

Each marker opens the corresponding station details.

Connected lakes

Lake Pfäffikon

Water knowledge

Understanding Aa

Aa: this overview puts the available stations and measurements in context. The exact location matters, not just the water body's name.

This overview includes 1 monitoring station for discharge. Not every station provides every measurement. Track changes at the same station, checking the timestamp, unit and source notes. Related waters in this overview: Lake Pfäffikon.

Discharge in m³/s is a volume per second, not the speed of the current. Station comparisons must account for location, measurement time and water travel time. A higher reading is neither automatically a flood warning nor an indication that the river is navigable.