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  5. 17-12-2025

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B1 The Heads

17 December 2025

Observation details

Overview

Estuary Barwon River Estuary
Site The Heads
Observation ID #17316
Date and Time Wednesday 17th December 2025 09:20am
Approved Approved

Notes

Laqua meter calibration did not work. Error 4. We gently tried cleaning but still did not work. Indicates membrane may need replacing.  We used ph testing strips.

Many Portuguese Man o war are littering the beaches.

Water Levels and Tides

Low tide time 16:10

Depth Profiling

Depth m Temperature °C Salinity ppt D.O. mg/L D.O. % sat EC mS/cm Notes
0.1m 17.30 43.50 9.25 95.1 62.20
Previous 16.7 36.7 9.5 97.6 52.4
Median 15.1 37.20 9.48 94.00 53.1
0.5m 17.30 36.70 9.27 95.4 52.40
Previous 16.0 36.8 9.8 99.5 52.6
Median 15.0 37.20 9.48 94.00 53.1
1.0m 17.30 37.00 9.30 95.8 52.90
Previous 16.7 36.9 9.4 97.1 52.7
Median 15.1 37.20 9.46 94.20 53.1
1.5m 17.30 37.10 9.31 95.9 53.00
Previous 16.0 36.8 9.8 99.3 52.6
Median 15.1 37.20 9.49 94.20 53.1
2.0m 17.30 37.20 9.33 96.1 53.20
Previous 16.7 37.0 9.4 96.5 52.8
Median 15.2 37.60 9.53 95.80 53.6
2.5m 17.30 37.20 9.33 96.1 53.20
Previous 16.0 36.8 9.8 99.1 52.6
Median 15.1 37.60 9.53 95.80 53.7
2.7m 17.30 37.20 9.34 96.2 53.20
Previous 15.3 35.3 9.3 92.3 50.5
Median 15.1 37.60 9.53 95.80 53.7

Top-Bottom Sampling

Depth m Turbidity NTU pH
Top 0.1 9 8.0
Previous 0.1 9 7.7
Median 0.1 9 7.9
Bottom 2.7 9 8.0
Previous 2.7 9 8.2
Median 2.5 9 8.0

Other details

Max depth 2.80
Previous 2.80
Median 2.60
Flow estimate Slow
Low tide time 16:10pm

Observation Documents

Link Date File name Description

Preceding Observations

C Estuary is closed to the sea. O Estuary is open to the sea. P Perched
We acknowledge and respect Victorian Traditional Owners as the original custodians of Victoria’s land and waters, their unique ability to care for Country and deep spiritual connection to it.
We honour Elders past and present whose knowledge and wisdom has ensured the continuation of culture and traditional practices.
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