Weekly Irrigation Requirements – Macalister Irrigation District

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MID ETo Update

19 March to 25 March 2020

The Ag Vic Maffra Team sends our well wishes to you during the COVID-19 event.
We are all working from home but are still contactable by mobile phone and email.
    • Flood irrigation interval for the last week was 11 days
    • Spray irrigation amount was 23 mm of irrigation water for the last week
    • The predicted weekly pasture water use for Bairnsdale is 21 mm,       MID 21 mm, Orbost 22 mm and Yarram 22 mm
    • Glenmaggie is at 48.4%
    * These figures are approximate and do not take into account rainfall on farm*
The Odd Spot

On Ground Works Incentive Extended
The deadline for on ground works (reuse, BPSI & flood to spray) incentive applications has been extended to the 17th of April. Call or email us to chat about any project you have in mind

Energy Investment Plan Extended to June 30th 2020
The Energy Investment plan grant application date has been extended to 30 June 2020 for the following streams

  • Tier 1 (up to $50,000)
  • Tier 1 Streamlined Dairy (up to $50,000) – limited list to choose from, but easier to apply
  • Tier 2 (up to $250,000)
Applications for a free on farm energy assessment will still close on 31st March
For more information, click here
Extension staff are now working from home until it is deemed safe for us to return to work. We are still available for phone calls & are also brainstorming how to support irrigators through this difficult time. If you have any ideas, or things you would like to know about, let us know.

ETo – Last Week Totals

Location ETo (mm) Effective Rain * mm (R) Dairy pasture coefficient Required Irrigation mm (ETo – R)
Boisdale 22 0 1 22
Cowwarr 21 0 1 21
East Sale  27 0 1 27
Nambrok 25 0 1 25
Tinamba 19 0 1 19
Location ETo (mm) Effective Rain * mm (R) Dairy pasture coefficient Required Irrigation mm (ETo – R)
Bairnsdale 28 0 1 28
Latrobe Valley Airport 22 0 1 22
Orbost 20 0 1 20
Yarram 25 0 1 25
Tip:  To convert mm to megalitres/ha, divide by 100.  Eg. 50mm = 0.5ML /ha.
* Effective rainfall = daily rainfall minus 2mm.
ETₒ   and the “crop coefficient” (conversion factor) of 1.0 applies to a healthy productive pasture 12 cm high.
** This data is not included when doing any of the below calculations
MID average daily pasture water use over the last week was 3.3 mm/day.

The approximate MID flood irrigation interval based on last week’s daily pasture water use rate was 11 days. (This figure assumes that 30 mm of readily available water is held in the pasture root zone divided by the 3.3 mm/day = 9 days and then add an extra two days to account for waterlogging). This does not take into account any rain your farm may have got during the week which will extend the interval.

Spray irrigators in the MID needed to have applied on average 23 mm of irrigation water for the week to meet pasture water use (3.3 x 7). This irrigation figure does not take into account any rainfall on your farm, which must be subtracted from the required irrigation figure, and assumes that the spray irrigation system is applying water at 100% uniformity. This figure may be greater depending on the specific spray irrigation system uniformity.

For Thursday 26 March to Wednesday 4 April

Location Predicted weekly pasture water use (mm/ha) Predicted Weekly Pasture water use (ML/ha) Predicted daily pasture water use (mm/day)
Bairnsdale 21 0.21 3.0
MID 21 0.21 3.0
Orbost 22 0.22 3.1
Yarram 22 0.22 3.1








This ETo update is also available as an email. Contact alexis.c.killoran@agriculture.vic.gov.au

The intention of this service is not for the information to be used in isolation when making decisions about irrigation
This publication is provided solely for information purposes and no representation or warranty is made as to its quality, accuracy, completeness, suitability or fitness for any particular purpose. You should make your own inquiries as to its appropriateness and suitability for your particular circumstances. The State of Victoria as represented by its Department of Jobs, Precincts and Regions accepts no duty of care and disclaims all liability in relation to use of this publication.
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