Weekly Irrigation Requirements – Macalister Irrigation District (Gippsland)

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**The ETo Weekly Irrigation Requirements will return at the start of the next irrigation season**

MID ETo Update

7 to 13 May 2020

    • Flood irrigation interval for the last week was 20 days
    • Spray irrigation amount was 12 mm of irrigation water for the last week
    • The predicted weekly pasture water use for Bairnsdale is 10 mm,  MID 9 mm, Orbost 10 mm and Yarram 10 mm
    • Glenmaggie is at 66.5%
    * These figures are approximate and do not take into account rainfall on farm*

The Odd Spot

Agriculture Workforce Plan
Agriculture Victoria has introduced their Agriculture Workforce Plan to assist agriculture, food processing & critical food supply chain businesses in rural & regional Victoria with:

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The Agriculture Workforce Plan provides assistance for worker accommodation and transportation to help fill roles where local people aren’t available.

Both businesses and and job seekers can register on the platform by clicking here

Winter Maintenance
With the closure of the irrigation season, over winter is a perfect opportunity to do on farm upgrades\maintenance to your irrigation systems. e.g on farm channel upgrades, filling up wheel ruts. If you have tensiometers, it is important that their gauges are removed before the first frost to avoid damaging the pressure gauge on them.

Testimonials Wanted
We are currently evaluating our irrigation program over the last 2 years if you have been involved in the program and have made changes as a result of either extension services we offer (e.g spray assessments, or other irrigation advice) or the incentives program  and would like to tell your story and share impacts, please get in contact with us.


ETo – Last Week Totals


ETo (mm) Effective Rain * mm (R) Dairy pasture coefficient Required Irrigation mm (ETo – R)


12 3.6 1



11 4.4 1


East Sale 

13 4.4 1



13 2.2 1



11 5.4 1



ETo (mm) Effective Rain * mm (R) Dairy pasture coefficient

Required Irrigation mm (ETo – R)


15 1.2 1


Latrobe Valley Airport

10 11.6 1



11 2.4 1




15.6 1


MID average daily pasture water use over the last week was 1.7
mm/dayTip:  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

The approximate MID flood irrigation interval based on last week’s daily pasture water use rate was 20 days. (This figure assumes that 30 mm of readily available water is held in the pasture root zone divided by the 1.7 mm/day = 18 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 12 mm of irrigation water for the week to meet pasture water use (1.7 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.
Forecast ETo

For Thursday 14 May to Wednesday  20 May


Predicted weekly pasture water use (mm/ha) Predicted Weekly Pasture water use (ML/ha) Predicted daily pasture water use (mm/day)


10 0.1 1.4


9 0.09


Orbost 10 0.1


Yarram 10 0.1










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.
If you know someone who you think would like to receive this weekly update, please forward this email to them so they can subscribe if they wish.
If you would like to unsubscribe from this email or if you have any questions, comments or feedback related to this email service please don’t hesitate to contact Alexis Killoran on 0428 387 869.
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