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Review of Australian Standards AS3778 series – Oct 2021 update

AHA Services - 08 October, 2021

Measuring flow in open channels

Standards Australia Technical Committee CE-024 advises on standards relating to Measurement Of Water Flow In Open Channels and Closed Conduits.

AHA and a number of AHA members are part of this Technical Committee, which has overseen a review of the AS 3778 series of standards: Measurement of water flow in open channels, particularly those which are more than 10 years old.

Technical Committee CE-024 has agreed to

  1. identical adoption of updated ISO standards as part of AS 3778
  2. reconfirm 2 existing AS standards without change
  3. withdraw 2 AS standards as the source ISO document has been withdrawn and material is covered in other standards which are adopted

In some cases, where reviewers recommended adopting the ISO standard in full but making minor additions/modifications, to expedite the review / update process, the Committee accepted the ISO standard without change.

Standards that the review recommends should be replaced

AS 3778.2.2-2001 Measurement of water flow in open channels – General – Establishment and operation of a gauging station

  • The ISO standards on which these AS 3778.2.2-2001 and AS 3778.2.1-2001 were based have been replaced by ISO 18365:2013 Hydrometry – Selection, establishment and operation of a gauging station
  • The review recommends that Australia accepts the updated ISO standard to replace the two current Australian Standards.

AS 3778.2.5-2001 Measurement of water flow in open channels – General – Guidelines for the selection of flow gauging structures

  • The ISO standard on which the AS is based has been replaced by ISO 8368:2019 Hydrometric determinations – Flow measurements in open channels using structures – Guidelines for selection of structure
  • The review recommends accept the updated ISO in full to replace current AS.

AS 3778.3.3-2001 Measurement of water flow in open channels – Velocity-area methods – Measurement by slope-area method

  • The ISO standard on which the AS is based has been replaced by ISO 1070:2018
  • The review recommends accept the updated ISO in full to replace current AS.

AS 3778.3.4-1990 Measurement of water flow in open channels – Velocity-area methods – Collection and processing of data for determination of errors in measurement

  • The ISO standard on which the AS is based has been replaced by ISO 1088:2007
  • The review recommends accept the updated ISO in full to replace current AS.

AS 3778.3.6-2001 Measurement of water flow in open channels – Velocity-area methods – Measurement of flow in tidal channels

  • The ISO standard on which the AS is based has been replaced by ISO 2425:2010
  • The review recommends accept the updated ISO in full to replace current AS.

AS 3778.3.7-2007 Measurement of water flow in open channels – Velocity-area methods – Measurement by ultrasonic (acoustic) method

  • The ISO standards on which AS 3778.3.7-2007 and AS 3778.6.7-1992 were based have been replaced by ISO 6416:2017 – Hydrometry – Measurement of discharge by ultrasonic transit time (time of flight) method.
  • The review recommends that Australia accepts the updated ISO standard to replace the two current Australian Standards.

AS 3778.4.1-1991 Measurement of water flow in open channels – Measurement using flow gauging structures – Thin-plate weirs

  • The ISO standard on which the AS is based has been replaced by ISO 1438:2017 Hydrometry – Open channel flow measurement using thin-plate weirs
  • The review recommends accept the updated ISO in full to replace current AS.

AS 3778.4.2-1991 Measurement of water flow in open channels – Measurement using flow gauging structures – Rectangular broad-crested weirs

  • The ISO standard on which the AS is based has been replaced by ISO 3846:2008 Hydrometry – Open channel flow measurement using rectangular broad-crested weirs
  • The review recommends accept the updated ISO in full to replace current AS.

AS 3778.4.5-1991 Measurement of water flow in open channels – Measurement using flow gauging structures – Triangular profile weirs

  • The ISO standard on which the AS is based has been replaced by ISO 4360:2020 Hydrometry – Open channel flow measurement using triangular profile weirs
  • The review recommends accept the updated ISO in full to replace current AS.

AS 3778.4.6-2007 Measurement of water flow in open channels – Measurement using flow gauging structures – Flat-V weirs

  • The ISO standard on which the AS is based has been replaced by ISO 4377:2012 Hydrometric determinations – Flow measurement in open channels using structures – Flat-V weirs
  • The review recommends accept the updated ISO in full to replace current AS.

AS 3778.4.7-1991 Measurement of water flow in open channels – Measurement using flow gauging structures – Rectangular, trapezoidal and U-shaped flumes

  • The ISO standard on which the AS is based has been replaced by ISO 4359:2013 Flow measurement structures – Rectangular, trapezoidal and U-shaped flumes
  • The review recommends accept the updated ISO in full to replace current AS.

AS 3778.4.10 Hydrometry — Liquid flow measurement using end depth method
in channels with a free overfall

  • The ISO standard on which the AS is based has been replaced by ISO 18481:2017 Hydrometry – Liquid flow measurement using end depth method in channels with a free overfall
  • The review recommends accept the updated ISO in full to replace current AS.

AS 3778.5.3-2007 Measurement of water flow in open channels – Liquid flow in open channels and partly filled pipes – Guidelines for the application of Doppler-based flow measurements

  • The ISO standard on which the AS is based has been replaced by ISO 15769:2010 Hydrometry – Guidelines for the application of acoustic velocity meters using the Doppler and echo correlation methods
  • The review recommends accept the updated ISO in full to replace current AS.

AS 3778.6.1-1992 Measurement of water flow in open channels – Measuring devices, instruments and equipment – Rotating element current-meters

  • The ISO standard on which the AS is based has been replaced by ISO 2537:2007 Hydrometry – Rotating-element current-meters
  • The review recommends accept the updated ISO in full to replace current AS.

AS 3778.6.2-1992 Measurement of water flow in open channels – Measuring devices, instruments and equipment – Direct depth sounding and suspension equipment

  • The ISO standard on which the AS is based has been replaced by ISO 3454:2008 Hydrometry – Direct depth sounding and suspension equipment
  • The review recommends accept the updated ISO in full to replace current AS.

AS 3778.6.4-1992 Measurement of water flow in open channels – Measuring
devices, instruments and equipment – Echo sounders for water depth
measurements

  • The ISO standard on which the AS is based has been replaced by ISO 3455:2021 Hydrometry – Calibration of current-meters in straight open tanks
  • The review recommends accept the updated ISO in full to replace current AS.

Withdraw these standards

The Committee has decided to withdraw the following Australian Standards as the source ISO document has been withdrawn:

  • AS 3778.2.1-2001 Measurement of water flow in open channels, Part 2.1:
    General – Guidelines for the selection of methods
    Refer to this review, and the review linked under AS 3778.2.2-2001 in the list of identical adoptions above
  • AS 3778.6.7-1992 Measurement of water flow in open channels – Measuring
    devices, instruments and equipment – Ultrasonic (acoustic) velocity meters
    Refer to this review, and the review linked under AS 3778.3.7-2007 in the list of identical adoptions above

Reconfirmed standards

The Committee has decided to reconfirm the following AS documents unchanged as still relevant:

  • AS 3778.2.4-2007 Measurement of water flow in open channels, Part 2.4:
    General – Estimation of uncertainty of a flow rate measurement
  • AS 3778.3.2-1990 Measurement of water flow in open channels – Velocity-area
    methods – Measurement by moving-boat method

 

We invite you to look at the review and recommendations. If you have any questions or comments, please contact as3778.review@aha.net.au. Your email will be sent to Linton Johnston, the chair of the Technical Committee (who is also an AHA member).

We expect the updates will be reflected on the Standards Australia website in the coming months.

We acknowledge the assistance of the working group members that did the reviews for the first batch of standards:

  • Brad Nicholson
  • Bruce Nicholson
  • Daniel Wagenaar
  • Glenn McDermott
  • Habibur Rahman
  • John Hayes
  • Linton Johnston
  • Mark Hopper
  • Max Best
  • Paul Sheahan
  • Rod Sandison
  • Shaun Gleeson

Prepared by Mark Hopper, Linton Johnston and Grant Robinson,
members of Technical Committee CE-024.