Weekly Irrigation Requirements – Macalister Irrigation District (Gippsland)

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MID ETo Update
16th December to 22nd December 2021


  • Flood irrigation interval for the last week wasdays
  • Spray irrigation amount was  33 mm of irrigation water for the last week
  • The predicted weekly pasture water use:
    • Bairnsdale is 30 mm, MID 30 mm, Orbost 30 mm and Yarram 32 mm
  • Glenmaggie is at 96.4%

* These figures are approximate and do not take into account rainfall on farm*

The Odd Spot
Merry Christmas and a Happy New Year!

On-Farm Emergency Water Infrastructure Rebate Scheme Round 2
The Victorian and Commonwealth Governments are offering a rebate to drought affected farm businesses who need to invest in on-farm water infrastructure that addresses the needs of grazing livestock or assists in maintaining existing permanent horticultural plantings.
The Scheme provides a one-off 25 per cent rebate up to $25,000 (GST exclusive) to eligible livestock and horticulture producers. The Scheme is open until the funds are fully allocated during 2021–22.
Link here: https://bit.ly/3duvc6O

Victorian Floods and Storms Clean-Up and Restoration Grants
Grant assistance is now available under joint Commonwealth-State Disaster Recovery Funding to assist primary producers directly affected by the Victorian Floods and Storms which occurred from 9-11 June 2021 (AGRN 969) with costs associated with clean-up and recovery activities needed to reinstate their primary production enterprise.
The maximum grant amount available under this program is $25,000 (GST exclusive).
Applications for grant assistance close on 31 May 2022.
Link here: https://bit.ly/3EkmEtZ


ETo – Last Week Totals

Location ETo (mm) Effective Rain * mm (R) Dairy pasture coefficient Required Irrigation mm (ETo – R)
Boisdale 30 16 1 14
Cowwarr 28 4.6 1 23.4
East Sale  37 11.2 1 25.8
Nambrok 40 3.2 1 36.8
Tinamba 28 10.4 1 17.6
Location ETo (mm) Effective Rain * mm (R) Dairy pasture coefficient Required Irrigation mm (ETo – R)
Bairnsdale 29 6.8 1 22.2
Latrobe Valley Airport 42.3 5 1 37.3
Orbost 29.7 37.2 1 0
Yarram 43.8 0 1 43.8

* 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 4.7 mm/day.

The approximate MID flood irrigation interval based on last week’s daily pasture water use rate was 8 days. (This figure assumes that 30 mm of readily available water is held in the pasture root zone divided by the 4.7 mm/day = 8 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 33 mm of irrigation water for the week to meet pasture water use (4.7 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.


For Friday 24th December to Wednesday 29th December

Location Predicted weekly pasture water use (mm/ha) Predicted Weekly Pasture water use (ML/ha) Predicted daily pasture water use (mm/day)
Bairnsdale 30 0.3 4.3
MID 33 0.33 4.7
Orbost 30 0.3 4.3
Yarram 32 0.32 4.6


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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