Page 1

2009-2010 Irrigation Status Report Private Diverters and Nyah District


Publication details

Acknowledgements

2009-2010 Irrigation Status Report –

DSE SIP Program

Private Diverters and Nyah District

Cover images Report Number: 0910/00038

Left: Almond development.

Project Number: 1474-2-101b

Photo: Mallee CMA.

Mallee Catchment

Contract Number: 10/800

Middle: Low-level spray irrigation.

Management Authority

Photo: Mallee CMA.

www.malleecma.vic.gov.au

Right: The Murray River at Nyah.

PO Box 5017 Mildura 3502

Photo: Mallee CMA.

Telephone 03 5051 4377

June 2010

Facsimile 03 5051 4379 Author: SunRISE 21 Incorporated 54 Lemon Ave MILDURA 3500 Phone: (03) 5023 7355

Copyright Š Mallee Catchment Management Authority 2010

Disclaimer Publications produced by the Mallee Catchment Management Authority may be of assistance to you but the Mallee Catchment Management Authority and its employees do not guarantee that the publication is without flaw of any kind or is wholly appropriate for your particular purpose and therefore disclaims all liability for any error, loss or other Version

Prepared

Author

Reviewed

1

May 2010

Sue Argus, SunRISE 21 Inc.

Geoffrey Denans

consequence which may arise from you relying on any information in any Mallee

Final Draft

May 2010

Sue Argus, SunRISE 21 Inc.

Regional Sustainability Technical Reference Committee

Final

June 2010

Sue Argus, SunRISE 21 Inc.

Geoffrey Denans

Project partners

Catchment Management Authority publication.


Contents Introduction ....................................................................................................................... 6 Background ........................................................................................................................ 7 Methodology and Limitations .......................................................................................... 8 Results............................................................................................................................... 11 1. Private Diverters from Nyah to Mildura ........................................................... 11 1.1 1.2 1.3

2.

Nyah River Reach................................................................................................. 15 2.1 2.2

3.

Not Irrigated Area.............................................................................................. 23 Wemen Change in Irrigated Area..................................................................... 26

Colignan River Reach .......................................................................................... 27 5.1 5.2

6.

Not Irrigated Area.............................................................................................. 19 Boundary Bend Change in Irrigated Area....................................................... 22

Wemen River Reach............................................................................................. 23 4.1 4.2

5.

Not Irrigated Area.............................................................................................. 15 Nyah Change in Irrigated Area......................................................................... 18

Boundary Bend River Reach............................................................................... 19 3.1 3.2

4.

Not Irrigated Area.............................................................................................. 11 Nyah to Mildura Irrigation Status .................................................................... 13 Nyah to Mildura Change in Irrigated Area ..................................................... 14

Not Irrigated Area.............................................................................................. 27 Colignan Change in Irrigated Area .................................................................. 30

Mildura River Reach ........................................................................................... 31 6.1 6.2

Not Irrigated Area.............................................................................................. 31 Mildura Change in Irrigated Area.................................................................... 34

References......................................................................................................................... 35

SunRISE 21 Inc.

2009-2010 Irrigation Status Report – Private Diverters

Page 3 of 35


List of Maps Map 1 – Sample NDVI map............................................................................................................ 8 Map 2 – Nyah Irrigated/Not Irrigated 2009-10 ............................................................................. 16 Map 3 – Nyah Irrigation Status 2009-10....................................................................................... 17 Map 4 – Boundary Bend Irrigated/Not Irrigated 2009-10 ............................................................ 20 Map 5 – Boundary Bend Irrigation Status 2009-10 ...................................................................... 21 Map 6 – Wemen Irrigated/Not Irrigated 2009-10 ......................................................................... 24 Map 7 – Wemen Irrigation Status 2009-10 ................................................................................... 25 Map 8 – Colignan Irrigated/Not Irrigated 2009-10 ....................................................................... 28 Map 9 – Colignan Irrigation Status 2009-10................................................................................. 29 Map 10 – Mildura Private Diverters’ Irrigated/Not Irrigated 2009-10 ......................................... 32 Map 11 – Mildura Private Diverters’ Irrigation Status 2009-10 ................................................... 33

List of Charts Chart 1 – NDVI range ................................................................................................................... 10 Chart 2 – Change in the area not irrigated per river reach ............................................................ 11 Chart 3 – Nyah to Mildura comparison of irrigation status in 2009-10 ........................................ 13

SunRISE 21 Inc.

2009-2010 Irrigation Status Report – Private Diverters

Page 4 of 35


List of Tables Table 1 – Total area not irrigated .................................................................................................. 11 Table 2 – Area not irrigated per river reach .................................................................................. 11 Table 3 – Nyah to Mildura irrigation method of areas not irrigated ............................................. 12 Table 4 – Nyah to Mildura salinity impact zone of areas not irrigated......................................... 12 Table 5 – Nyah to Mildura irrigation status .................................................................................. 13 Table 6 – Private diverters change in irrigated crop types ............................................................ 14 Table 7 – Private diverters change in irrigation methods of irrigated crops ................................. 14 Table 8 – Nyah area not irrigated.................................................................................................. 15 Table 9 – Nyah irrigation method of areas not irrigated ............................................................... 15 Table 10 – Nyah salinity impact zone of areas not irrigated......................................................... 15 Table 11 – Nyah change in irrigated crops.................................................................................... 18 Table 12 – Nyah change in irrigation methods of irrigated crops................................................. 18 Table 13 – Boundary Bend area not irrigated ............................................................................... 19 Table 14 – Boundary Bend irrigation method of areas not irrigated............................................. 19 Table 15 – Boundary Bend salinity impact zone of areas not irrigated ........................................ 19 Table 16 – Boundary Bend change in irrigated crops ................................................................... 22 Table 17 – Boundary Bend change in irrigation methods of irrigated crops ................................ 22 Table 18 – Wemen not irrigated area ............................................................................................ 23 Table 19 – Wemen irrigation method of the areas not irrigated.................................................... 23 Table 20 – Wemen salinity impact zone of areas not irrigated ..................................................... 23 Table 21 – Wemen change in irrigated crops................................................................................ 26 Table 22 – Wemen change in irrigation methods of irrigated crops ............................................. 26 Table 23 – Colignan not irrigated area.......................................................................................... 27 Table 24 – Colignan irrigation method of areas not irrigated ....................................................... 27 Table 25 – Colignan salinity impact zone of areas not irrigated................................................... 27 Table 26 – Colignan change in irrigated crops.............................................................................. 30 Table 27 – Colignan change in irrigation methods of irrigated crops........................................... 30 Table 28 – Mildura private diverters’ area not irrigated ............................................................... 31 Table 29 – Mildura private diverters’ irrigation method of areas not irrigated............................. 31 Table 30 – Mildura private diverters’ salinity impact zone of areas not irrigated ........................ 31 Table 31 – Mildura private diverters’ change in irrigated crops................................................... 34 Table 32 – Mildura private diverters’ change in irrigation method of irrigated crops.................. 34

SunRISE 21 Inc.

2009-2010 Irrigation Status Report – Private Diverters

Page 5 of 35


Introduction This report was commissioned by the Mallee Catchment Management Authority (Mallee CMA) to capture baseline information for the next five year review of the Nyah to South Australian Border and the Nangiloc-Colignan salinity management plans. The project is funded through the program ‘Delivery of the recommendations arising from the five year reviews of the Nyah to SA border and Nangiloc-Colignan salinity management plans’.

Acknowledgements The project was undertaken in collaboration with Lower Murray Water (LMW) which included the provision of irrigation water supply data to 30 April 2010. Irrigation status for citrus plantings was validated against the Murray Valley Citrus Board’s plantings database; providing reliable and current information. A number of individual irrigators also provided direct input to validating of irrigation status and their time and support is greatly appreciated.

Intended Outcomes Rapid and profound changes and structural adjustment are occurring in irrigation industries across the Mallee region. These changes are principally being driven by current economic conditions; particularly those experienced within the wine grape and citrus industries. Water supply issues and associated increases in business input costs; from water purchases required to meet crop requirements to structural adjustment, are profoundly affecting the horticulture industries. Change is also being driven by Australian Government policies; implementation of various water recovery programs and buy back initiatives1. The intended outcome of this project is an improved understanding of the extent to which current conditions are impacting on irrigated horticulture in the private diverter areas from Nyah to lock 10 at Wentworth. This encompasses five river reaches along the Murray River; Nyah to the Wakool junction (i.e. the Nyah river reach including the Nyah pumped irrigation district), Wakool junction to Euston weir (i.e. the Boundary Bend river reach), Euston weir to Liparoo (i.e. the Wemen river reach), Colignan to Koorlong (i.e. the Colignan river reach) and private diverters from Nichols Point to lock 10 at Wentworth (i.e. the Mildura river reach).

Results Summary The irrigable area*2 for the five river reaches increased by 33% (12,905 hectares; predominantly almonds and olives) from 2005-06 to 2009-10. The area ‘not irrigated’ also increased; from 9% (3,600 hectares) of the irrigable area in 2005-06 to 17% (8,515 hectares) in 2009-10. The area not irrigated was predominantly seasonal cropping; surface irrigated field crops, where it is likely that water was transferred for use on permanent plantings. Permanent plantings not irrigated were predominantly grapevines and to a lesser extent citrus (see Table 6). Results for each river reach in 2009-10 are as follows; • 42% (3,940 hectares) of the Nyah river reach irrigable area was not irrigated. The irrigable area increased by 1,845 hectares from 2005-06 to 2009-10. • 7% (1,370 hectares) of the Boundary Bend river reach irrigable area was not irrigated. The irrigable area increased by 6,470 hectares from 2005-06 to 2009-10. • 5% (545 hectares) of the Wemen river reach irrigable area was not irrigated. The irrigable area increased by 4,325 hectares from 2005-06 to 2009-10. • 18% (1,965 hectares) of the Colignan river reach irrigable area was not irrigated. The irrigable area increased by 235 hectares from 2005-06 to 2009-10. • 40% (695 hectares) of the Mildura river reach irrigable area was not irrigated. The irrigable area increased by 30 hectares from 2005-06 to 2009-10. 1

Extract from the Mallee CMA 2009-2010 Irrigation Status Report – Project Plan. *2 Irrigable area is the planted area irrigated plus the area previously irrigated but now vacant or dried-off.

SunRISE 21 Inc.

2009-2010 Irrigation Status Report – Private Diverters

Page 6 of 35


Background Successive low inflows into Murray Darling Basin catchments have directly affected water allocations over the past few years. Irrigators received a final seasonal water allocation of 43% in 2007/08 and 35% in 2008/09. While the final allocation for 2009-2010 reached 100% in April 2010 (after harvest), the season commenced 1 July 2009 with 0% and then allocation increases announced as the season progressed did not meet crop water requirement. High evapostranspiration due to an unusually hot start to the season left many irrigators needing to draw on temporary water trades. The 2009-10 season water allocation announcements were; 17 August 0%, 1 September 2%, 15 October 37%, 16 November 55%, 15 December 60%, 15 January 63%, 1 February 63%, 15 March 78% and 1 April 100%. Irrigators have adopted different strategies or combination of strategies in response to prevailing conditions of water insecurity and low commodity prices. Strategies include: 1. Use of carryover water plus temporary trades to meet irrigation requirements. 2. Dewatering of some crops to save water for potentially more profitable crops. 3. Dewatering of entire properties and deriving an income from temporary and/or permanent water trades. 4. Replacement of permanent plantings with seasonal crops. 5. Reworking, replanting, moth-balling and/or upgrading to drippers or low level sprinklers. 6. Selling the farm. This project provides additional information to the 2009 Crop Report (Mallee Irrigated Horticulture 1997 to 2009) and the 2009-10 Irrigation Status Report - Pumped Irrigation Districts report commissioned by the Mallee Catchment Management Authority and delivered by SunRISE 21. This 2009-10 study is primarily based on analysis of satellite imagery in conjunction with SunRISE 21’s crop mapping. Validation of results and field surveys were undertaken by SunRISE 21 and individual irrigators. The methodology is described in the following section.

SunRISE 21 Inc.

2009-2010 Irrigation Status Report – Private Diverters

Page 7 of 35


Methodology and Limitations Satellite imagery and NDVI The study methodology uses NDVI (Normalised Difference Vegetation Index) to evaluate whether or not a crop is being irrigated. NDVI is derived from the red and near infrared bands of satellite imagery, or aerial photography, and is an indicator of vegetation density and vigour. Green leaves give a much higher reflectance response in the near infrared than in the visible spectral range. As vegetation comes under water stress, its leaves become more yellow, they reflect significantly less in the near infrared range and the NDVI becomes a lower than normal value. The NDVI of healthy vegetation is typically within a range of 0.1 to 0.6. Rapid Eye satellite imagery was used for the study as it is multispectral, relatively high resolution (5 metre pixels), and relatively inexpensive if archival imagery is acquired. Archival imagery was available across the study area; • Nyah – February 2010; • Boundary Bend – March 2010; • Wemen – March 2010; • Colignan – January and February 2010; and • Mildura private diverters – November 2009. The following map shows a Rapid Eye NDVI image of the Nichols Point area. Colours range from deep blue to pale blue, to yellows, oranges and red. Deep blue denotes the highest NDVI indicating the most vigorous vegetation. Blue areas that coincided with the SunRISE 21 crop mapping were considered to be irrigated and yellow, orange or red areas coinciding with the crop mapping were generally assessed as not irrigated. Map 1 – Sample NDVI map Mildura November 2009 NDVI Value High : 0.35 Low : -0.2

0

1

2

¯

4

Kilometers

Positional accuracy of the acquired imagery had to be significantly improved to undertake the study as it was essential to align it as closely as possible with SunRISE 21’s crop mapping. A positional accuracy within 10 metres (2 pixels) was achieved where possible. An average NDVI was then derived from the satellite imagery for each crop patch in the crop mapping.

SunRISE 21 Inc.

2009-2010 Irrigation Status Report – Private Diverters

Page 8 of 35


LMW water use data Water use data for the period 01/07/2009 to 30/04/2010 was acquired from LMW and aligned with SunRISE 21’s crop mapping. Only a limited number of properties were aligned as assessment and licence details in the crop mapping is incomplete for private diverters.

Rainfall Daily rainfall data was accessed for the Mildura airport weather station to assess rainfall events prior to the dates of the satellite imagery. There was no significant rainfall events within two weeks prior to the November and January imagery, however there was 10mm recorded eight days prior to the March imagery. How and if this influences results of the study is unclear, but a limitation of the methodology may be that rainfall stimulating ground cover growth, including weeds, could influence the NDVI and result in a vacant or not irrigated area returning a higher NDVI reading and being interpreted as an irrigated area.

Control group and methodology limitations A control group of known irrigation status for different crop types was established to test different scenarios and NDVI responses. From this control group the following limitation of equating NDVI with irrigation status was determined: –

Seasonal crops such as pasture and vegetables can not be detected unless they were being irrigated at the time of the imagery capture. This significantly limits the effectiveness of using NDVI in the Wemen and Nyah river reaches where significant areas are vegetables and field crops.

NDVI does not apply to crops with plastic covers or netting, however it is considered safe to assume that crops with covers or netting are irrigated.

The NDVI of end crop patches or narrow crop patches can be significantly influenced by adjoining crop patches or vacant land due to limitations in positional accuracy and resolution of the imagery (i.e. the NDVI is influenced by reflectance from an adjoining crop or bare ground.)

Irrigation from overhead sprays watering adjoining vacant land can influence ground cover growth and result in an NDVI interpreted as ‘irrigated’.

Young crops have a much lower than normal NDVI value because new plantings have little canopy.

The purpose of the study is to determine areas that were not irrigated in the 2009-10 season; however the following chart, Chart 1, shows that NDVI is not a robust means of determining this. An NDVI value for a crop not irrigated could also be a new crop (planted 2007 to 2009) or field crop or vegetables not irrigated at the time of the imagery. The NDVI methodology does not conclusively determine areas not irrigated; but used in conjunction with SunRISE 21’s crop mapping it does determine, to a high level of confidence, those areas that are irrigated and hence eliminates a significant proportion of areas from the need of any further investigation.

SunRISE 21 Inc.

2009-2010 Irrigation Status Report – Private Diverters

Page 9 of 35


NDVI range The following chart shows NDVI range for the main crop types in the study area. The range represents one standard deviation from the mean. New crops are those that were planted in 2007, 2008 or 2009. The NDVI range for crops not irrigated in 2009-10 coincides with the NDVI of new crops, crops with covers or netting and vegetables and field crops. Chart 1 – NDVI range 0.5

NDVI range

0.4 0.3 0.2 0.1

it tr ee ne w Gr ap en ew Cit rus ne Nu w t t Ta ree b le ne gr a w pe Cit c rus ove cov rs ers / ne ts F ie ld cr o p Ve ge t ab NI le s sin ce 20 NI 09 sin ce 20 NI 08 sin ce 20 07

pe t tr ee

F ru

Nu

gra

pe Dr

i ed

g ra ne

it tr

Wi

rus

Fru

Ci t

Ta

bl e

gr a

pe

-0.1

ee

0.0

Steps to assigning irrigation status Irrigation status was determined from a process of elimination, starting with data of the highest level of confidence and the easiest means of assessment. The range of data used included; NDVI, identification of crops with covers or netting from a natural colour version of the satellite imagery, field surveys, water use data, recent grower surveys, 2009 crop types and the age of plantings. The following steps were undertaken in assigning irrigation status; 1. All crops with covers or netting were assigned a status of ‘irrigated’. 2. All crops with NDVI greater than 0.12 were assigned a status of ‘irrigated’. 3. All crops on properties where the grower was surveyed in 2009 or 2010 were assigned a status as per the survey. 4. All areas with water licences recording zero water usage were assigned a status of ‘not irrigated’. 5. All remaining permanent crops planted 2007 to 2009 or reworked in 2008 or 2009 were assigned a status of ‘irrigated’. 6. All remaining permanent crops or vacant areas with NDVI less than 0.0 were assigned a status of ‘not irrigated’. 7. All remaining crops (i.e. permanent crops with an NDVI of 0.0 to 0.12, seasonal crops and vacant areas) were individually assessed based on field survey, grower survey or a combination of water use, crop mapping details and NDVI.

Field Surveys and result verification Field checks of the private diverter areas from Nyah to Mildura were undertaken in May 2010. SunRISE 21 Inc.

2009-2010 Irrigation Status Report – Private Diverters

Page 10 of 35


Results 1.

Private Diverters from Nyah to Mildura

Results in this section are for private diverters from Nyah to Mildura lock 10, comprising five river reaches of; Nyah (including the Nyah pumped irrigation district), Boundary Bend, Wemen, Colignan and Mildura (outside the pumped irrigation districts).

1.1

Not Irrigated Area

Nyah to Mildura river reaches comprise 51,555 hectares of irrigable land; an increase of 12,905 hectares since 2005-06. In the 2009-10 irrigation season 17% (8,515 hectares) of the irrigable area was not irrigated. The area not irrigated increased from 9% (3,600 hectares) in 2005-06 to 17% (8,515 hectares) in 2009-10. Table 1 – Total area not irrigated Not Irrigated (NI) Perennial Seasonal Total NI Total irrigable

2005-06 Not Irrigated (ha) % 685 7% 2,915 2% 3,600 9% 38,650

2007-08 Not Irrigated (ha) % No data

2008-09 Not Irrigated (ha) % 2,655 5% 6,310 12% 8,965 17% 51,440

2009-10 Not Irrigated (ha) % 2,430 5% 6,085 12% 8,515 17% 51,555

The area not irrigated increased between 2005-06 and 2008-09 in each of the river reaches except for Wemen, and then decreased between 2008-09 and 2009-10 except for the Colignan and Mildura river reaches. Table 2 – Area not irrigated per river reach 2005-06 Not Irrigated (ha) % 1,290 17% 990 8% 485 8% 620 6% 215 12% 3,600 9%

River reach Nyah Boundary Bend Wemen Colignan Mildura Total NI

2007-08 Not Irrigated (ha) %

No data

2008-09 Not Irrigated (ha) % 4,090 44% 1,875 10% 655 6% 1,785 17% 560 32% 8,965 17%

2009-10 Not Irrigated (ha) % 3,940 42% 1,370 7% 545 5% 1,965 18% 695 40% 8,515 17%

Percentages are per river reach, i.e. 17% of the Nyah river reach was ‘not irrigated’ in 2005-06, 44% ‘not irrigated’ in 2008-09 and 42% ‘not irrigated’ in 2009-10. Chart 2 – Change in the area not irrigated per river reach 4,500 4,000

2005-06 NI 3,500

2008-09 NI

hectares

3,000

2009-10 NI

2,500 2,000 1,500 1,000 500 0

Nyah

SunRISE 21 Inc.

Boundary Bend

Wemen

Colignan

Mildura private

2009-2010 Irrigation Status Report – Private Diverters

Page 11 of 35


Nyah to Mildura not irrigated area Areas not irrigated have predominantly been furrow irrigated. In 2009-10, only 4% (1,750 hectares) of the irrigable area had drippers or low level sprinklers but was not irrigated. Irrigation methods of the ‘not irrigated’ areas are shown in the following table. Table 3 – Nyah to Mildura irrigation method of areas not irrigated Irrigation Method Drip Low level Overhead & pivot Furrow/Flood Total

2005-06 Not Irrigated (ha) % 165 0% 400 1% 905 2% 2,130 6% 3,600 9%

2007-08 Not Irrigated (ha) % No data

2008-09 Not Irrigated (ha) % 1,095 2% 795 2% 2,260 4% 4,815 9% 8,965 17%

2009-10 Not Irrigated (ha) % 970 2% 780 2% 2,110 4% 4,655 9% 8,515 17%

Areas not irrigated are predominantly in the low river salinity impact zones; LIZ 1, LIZ 2 and LIZ 3. In 2009, 2% (795 hectares) of the irrigable area was not irrigated and was in the high salinity impact zone (HIZ). Table 4 – Nyah to Mildura salinity impact zone of areas not irrigated Salinity impact zone LIZ 1, 2 & 3 LIZ 4 HIZ Total

SunRISE 21 Inc.

2005-06 Not Irrigated (ha) % 2,910 7% 415 1% 275 1% 3,600 9%

2007-08 Not Irrigated (ha) % No data

2008-09 Not Irrigated (ha) % 6,970 13% 1,335 3% 660 1% 8,965 17%

2009-2010 Irrigation Status Report – Private Diverters

2009-10 Not Irrigated (ha) % 6,235 12% 1,485 3% 795 2% 8,515 17%

Page 12 of 35


1.2

Nyah to Mildura Irrigation Status

The following table presents irrigation status for the Nyah to Mildura river reaches (i.e. private diverters and the Nyah pumped irrigation district). At least 32% (16,685 hectares) of the irrigable area is new plantings or crops redeveloped since 2006 and 6% (3,090 hectares) has not been irrigated since 2006. Table 5 – Nyah to Mildura irrigation status 2009-10 Status

3,090

% of Total area 6%

4,635

9%

790

2%

16,685 26,355 51,555

32% 51%

Hectares

Not Irrigated since 2006-07 Not Irrigated since 2007-08 Not Irrigated since 2008-09 Not irrigated since 2009-10 Irrigated & new or redeveloped since 2006 Irrigated since before 2006 Total irrigable area

17%

83% 100%

The following chart shows the proportion of irrigated and not irrigated areas for each of the river reaches. Chart 3 – Nyah to Mildura comparison of irrigation status in 2009-10 100% 80%

Irrigated since before 2006 Irrigated redev.since 2006

60%

Not irrigated since 2009-10

40%

Not irrigated since 2008-09

20%

Not irrigated since 2007-08 Not irrigated since 2006-07

0% Nyah

SunRISE 21 Inc.

Boundary Bend

Wemen

Colignan

M ildura

2009-2010 Irrigation Status Report – Private Diverters

Page 13 of 35


1.3

Nyah to Mildura Change in Irrigated Area

Change in crop type The Nyah to Mildura irrigated area increased by 7,990 hectares between 2005-06 and 2009-10. New plantings were predominantly almond trees and olive trees. Table 6 – Private diverters change in irrigated crop types Irrigated Crop Grapevine Citrus Perennial Fruit tree plantings Nut tree Other Field crop Seasonal plantings Vegetable Total irrigated Total irrigable area

2005-06 Irrigated (ha) % 33% 11,590 10% 3,425 6% 2,000 23% 8,200 1% 535 11% 3,745 16% 5,555 35,050 100% 38,650

Change (ha) total -1,225 -90 +2,835 +10,445 -90 -2,915 -970 +7,990

2009-10 Irrigated (ha) 10,365 3,335 4,835 18,645 445 830 4,585 43,040 51,555

% 24% 8% 11% 43% 1% 2% 11% 100%

Change in irrigation method Furrow irrigation declined by 2,725 hectares; from 10% (3,540 hectares) of irrigated crops in 2005-06 to 2% (815 hectares) of irrigated crops in 2009-10. Drip irrigation increased by 14,795 hectares; from 51% (17,750 hectares) of irrigated crops in 2005-06 to 75% (32,545 hectares) of irrigated crops in 2009-10. In 2009-10, 84% (36,265 hectares) of crops were irrigated with drippers or low level sprinklers. Table 7 – Private diverters change in irrigation methods of irrigated crops Irrigation Method Drip Low level Overhead & pivot Furrow & flood Total

SunRISE 21 Inc.

2005-06 Irrigated (ha) % 17,750 51% 3,980 11% 9,780 28% 3,540 10% 35,050 100%

2005-06 to 2009-10 change (ha) +14,795 -260 -3,820 -2,725 +7,990

2009-2010 Irrigation Status Report – Private Diverters

2009-10 Irrigated (ha) 32,545 3,720 5,960 815 43,040

% 75% 9% 14% 2% 100%

Page 14 of 35


2.

Nyah River Reach

2.1

Not Irrigated Area

The Nyah river reach, including the Nyah pumped irrigation district, comprises 9,280 hectares of irrigable land; an increase of 1,845 hectares since 2005-06. In the 2009-10 irrigation season, 42% (3,940 hectares) of the irrigable area was not irrigated; this was predominantly areas established for flood irrigation of field crops. The area not irrigated increased from 17% (1,290 hectares) in 2005-06 to 42% (3,940 hectares) in 2009-10. Note that these figures are limited due to the difficulty in determining active and non active seasonal cropping. Table 8 – Nyah area not irrigated Not Irrigated (NI) Perennial Seasonal Total NI Total irrigable

2005-06 Not Irrigated (ha) % 125 2% 1,165 15% 1,290 17% 7,435

2007-08 Not Irrigated (ha) % No data

2008-09 Not Irrigated (ha) % 410 4% 3,680 40% 4,090 44% 9,235

2009-10 Not Irrigated (ha) % 290 3% 3,650 39% 3,940 42% 9,280

Areas not irrigated have predominantly been furrow or flood irrigated. In 2009-10, only 3% (315 hectares) of the Nyah river reach irrigable area had drippers or low level sprinklers but was not irrigated. Irrigation methods of the ‘not irrigated’ areas are shown in the following table. Table 9 – Nyah irrigation method of areas not irrigated Irrigation Method Drip Low level Overhead & pivot Furrow & flood Total

2005-06 Not Irrigated (ha) % 35 0% 55 1% 80 1% 1,120 15% 1,290 17%

2007-08 Not Irrigated (ha) % No data

2008-09 Not Irrigated (ha) % 215 2% 135 1% 270 3% 3,470 38% 4,090 44%

2009-10 Not Irrigated (ha) % 175 2% 140 1% 215 2% 3,410 37% 3,940 42%

The Nyah river reach is in the low river salinity impact zones; LIZ 1 and LIZ 2. No areas are in the high salinity impact zone (HIZ). Table 10 – Nyah salinity impact zone of areas not irrigated Salinity impact zone LIZ 1, LIZ 2 HIZ Total

SunRISE 21 Inc.

2005-06 Not Irrigated (ha) % 1,290 17% 0 0% 1,290 17%

2007-08 Not Irrigated (ha) % No data

2008-09 Not Irrigated (ha) % 4,090 44% 0 0% 4,090 44%

2009-2010 Irrigation Status Report – Private Diverters

2009-10 Not Irrigated (ha) % 3,940 42% 0 0% 3,940 42%

Page 15 of 35


Map 2 – Nyah Irrigated/Not Irrigated 2009-10

Mallee Highway

Mu rra H ey all yV wy

¯ 0

2.5

5

10

Kilometers

Nyah Irrigation District

Irrigated / Not Irrigated Areas

Hectares

% of Total area

Not irrigated 2009-10

3,940

42%

Irrigated 2009-10

5,340

58%

9,280

100%

Total

SunRISE 21 Inc.

2009-2010 Irrigation Status Report – Private Diverters

Page 16 of 35


Map 3 – Nyah Irrigation Status 2009-10

Mallee Highway

Mu rra H ey all yV wy

¯ 0

2.5

5

10

Kilometers

Nyah Irrigation District

Not Irrigated since 2006-07 Not Irrigated since 2007-08 Not Irrigated since 2008-09 Not irrigated since 2009-10

1,130

% of Total area 12%

2,645

28%

165

2%

Irrigated & new or redeveloped since 2006 Irrigated since before 2006 total

2,560 2,780 9,280

28% 30%

Map 3

2009-10 Status

SunRISE 21 Inc.

Hectares

2009-2010 Irrigation Status Report – Private Diverters

See Map 2

42%

NOT Irrigated

58%

Irrigated

100%

Page 17 of 35


2.2

Nyah Change in Irrigated Area

Change in crop type The Nyah river reach irrigated area decreased by 805 hectares between 2005-06 and 2009-10. New plantings were predominantly almond trees and stone fruit trees. Table 11 – Nyah change in irrigated crops Irrigated Crop Grapevine Citrus Perennial Fruit tree plantings Nut tree Other Field crop Seasonal plantings Vegetable Total irrigated Total irrigable area

2005-06 Irrigated (ha) % 1,605 26% 105 2% 485 8% 305 5% 80 1% 2,805 46% 760 12% 6,145 100% 7,435

Change (ha) -85 +15 +25 +1,945 -5 -2,350 -350 -805

2009-10 Irrigated (ha) % 1,520 28% 120 2% 510 10% 2,250 42% 75 1% 455 9% 410 8% 5,340 100% 9,280

Change in irrigation method In the Nyah river reach, furrow irrigation declined by 2,430 hectares; from 48% (2,925 hectares) of irrigated crops in 2005-06 to 9% (495 hectares) of irrigated crops in 2009-10. Drip irrigation increased by 2,115 hectares; from 29% (1,775 hectares) of irrigated crops in 2005-06 to 73% (3,890 hectares) of irrigated crops in 2009-10. In 2009-10, 82% (4,365 hectares) of crops were irrigated with drippers or low level sprinklers. Table 12 – Nyah change in irrigation methods of irrigated crops Irrigation Method Drip Low level Overhead & pivot Furrow & flood Total irrigated

SunRISE 21 Inc.

2005-06 Irrigated (ha) % 1,775 29% 500 8% 945 15% 2,925 48% 6,145 100%

2005-06 to 2009-10 change (ha) +2,115 -25 -465 -2,430 -805

2009-2010 Irrigation Status Report – Private Diverters

2009-10 Irrigated (ha) % 3,890 73% 475 9% 480 9% 495 9% 5,340 100%

Page 18 of 35


3.

Boundary Bend River Reach

3.1

Not Irrigated Area

The Boundary Bend river reach comprises 19,315 hectares of irrigable land; an increase of 6,470 hectares since 2005-06. In the 2009-10 irrigation season, 7% (1,370 hectares) of the irrigable area was not irrigated. The area not irrigated decreased from 8% (990 hectares) in 2005-06 to 7% (1,370 hectares) in 2009-10 as shown in the following table. Table 13 – Boundary Bend area not irrigated Not Irrigated (NI) Perennial Seasonal Total NI Total irrigable

2005-06 Not Irrigated (ha) % 165 1% 825 7% 990 8% 12,845

2007-08 Not Irrigated (ha) % No data

2008-09 Not Irrigated (ha) % 695 4% 1,180 6% 1,875 10% 19,275

2009-10 Not Irrigated (ha) % 300 2% 1,070 5% 1,370 7% 19,315

Areas not irrigated have predominantly been furrow or flood irrigated. In 2009-10, only 1% (195 hectares) of the Boundary Bend river reach irrigable area had drippers or low level sprinklers but was not irrigated. Irrigation methods of ‘not irrigated’ areas are shown in the following table. Table 14 – Boundary Bend irrigation method of areas not irrigated Irrigation Method Drip Low level Overhead Furrow/Flood Total

2005-06 Not Irrigated (ha) % 5 0% 75 1% 325 2% 585 5% 990 8%

2007-08 Not Irrigated (ha) % No data

2008-09 Not Irrigated (ha) % 400 2% 100 1% 640 3% 735 4% 1,875 10%

2009-10 Not Irrigated (ha) % 100 1% 95 0% 505 3% 670 3% 1,370 7%

Areas not irrigated are in the low river salinity impact zones; LIZ 1, LIZ 2 and LIZ 3. No areas are in the high salinity impact zone (HIZ). Table 15 – Boundary Bend salinity impact zone of areas not irrigated Salinity impact zone LIZ 1, 2 & 3 HIZ Total

SunRISE 21 Inc.

2005-06 Not Irrigated (ha) % 990 8% 0 0% 990 8%

2007-08 Not Irrigated (ha) % No data

2008-09 Not Irrigated (ha) % 1,875 10% 0 0% 1,875 10%

2009-2010 Irrigation Status Report – Private Diverters

2009-10 Not Irrigated (ha) % 1,370 7% 0 0% 1,370 7%

Page 19 of 35


Map 4 – Boundary Bend Irrigated/Not Irrigated 2009-10

r Mu y ra y l le Va Hi

Robinvale Irrigation District

gh wa y

¯ 0

2.5

5

10

Kilometers

Irrigated / Not Irrigated Areas

Hectares

Not irrigated 2009-10 Irrigated 2009-10 Total

SunRISE 21 Inc.

% of Total area 1,370

7%

17,945

93%

19,315

100%

2009-2010 Irrigation Status Report – Private Diverters

Page 20 of 35


Map 5 – Boundary Bend Irrigation Status 2009-10

r Mu y ra y l le Va Hi

Robinvale Irrigation District

gh wa y

¯ 0

2.5

5

10

Kilometers

Map 5

2009-10 Status Not Irrigated since 2006-07 Not Irrigated since 2007-08 Not Irrigated since 2008-09 Not irrigated since 2009-10 Irrigated & new or redeveloped since 2006-07 Irrigated since before 2006-07 total

SunRISE 21 Inc.

Hectares 905

% of Total area 4%

335

2%

130

1%

8,440 9,505 19,315

44% 49%

2009-2010 Irrigation Status Report – Private Diverters

See Map 4

7%

NOT Irrigated

93%

Irrigated

100%

Page 21 of 35


3.2

Boundary Bend Change in Irrigated Area

Change in crop type The Boundary Bend river reach irrigated area increased by 6,090 hectares between 2005-06 and 2009-10. New plantings were predominantly almond trees and olive trees. Table 16 – Boundary Bend change in irrigated crops Irrigated Crop Grapevine Citrus Perennial Fruit tree plantings Nut tree Other Field crop Seasonal plantings Vegetable Total irrigated Total irrigable area

2005-06 Irrigated (ha) % 2,520 21% 370 3% 1,240 10% 5,180 44% 45 0% 540 5% 1,960 17% 11,855 100% 12,845

Change (ha) -50 -65 +1,930 +5,180 +5 -380 -530 +6,090

2009-10 Irrigated (ha) % 2,470 14% 305 2% 3,170 17% 10,360 58% 50 0% 160 1% 1,430 8% 17,945 100% 19,315

Change in irrigation method In the Boundary Bend river reach, furrow irrigation declined by 95 hectares; from 2% (200 hectares) of irrigated crops in 2005-06 to 1% (105 hectares) of irrigated crops in 2009-10. Drip irrigation increased by 7,295 hectares; from 65% (7,695 hectares) of irrigated crops in 2005-06 to 83% (14,990 hectares) of irrigated crops in 2009-10. In 2009-10, 88% (15,840 hectares) of crops were irrigated with drippers or low level sprinklers. Table 17 – Boundary Bend change in irrigation methods of irrigated crops Irrigation Method Drip Low level Overhead & pivot Furrow & flood Total

SunRISE 21 Inc.

2005-06 Irrigated (ha) % 7,695 65% 825 7% 3,135 26% 200 2% 11,855 100%

2005-06 to 2009-10 change (ha) +7,295 +25 -1,135 -95 +6,090

2009-2010 Irrigation Status Report – Private Diverters

2009-10 Irrigated (ha) % 14,990 83% 850 5% 2,000 11% 105 1% 17,945 100%

Page 22 of 35


4.

Wemen River Reach

4.1

Not Irrigated Area

The Wemen river reach comprises 10,540 hectares of irrigable land; an increase of 4,325 hectares since 2005-06. In the 2009-10 irrigation season, 5% (545 hectares) of the irrigable area was not irrigated. The area not irrigated decreased from 8% (485 hectares) in 2005-06 to 5% (545 hectares) in 2009-10 as shown in the following table. Table 18 – Wemen not irrigated area Not Irrigated (NI) Perennial Seasonal Total NI Total irrigable

2005-06 Not Irrigated (ha) % 50 1% 435 7% 485 8% 6,215

2007-08 Not Irrigated (ha) % No data

2008-09 Not Irrigated (ha) % 165 1% 490 5% 655 6% 10,540

2009-10 Not Irrigated (ha) % 160 1% 385 4% 545 5% 10,540

In 2009-10, only 3% (315 hectares) of the Wemen river reach irrigable area had drippers or low level sprinklers but was not irrigated. Irrigation methods of the ‘not irrigated’ areas are shown in the following table. Table 19 – Wemen irrigation method of the areas not irrigated Irrigation Method Drip Low level Overhead Furrow/Flood Total

2005-06 Not Irrigated (ha) % 0 0% 235 4% 145 2% 105 2% 485 8%

2007-08 Not Irrigated (ha) % No data

2008-09 Not Irrigated (ha) % 25 0% 360 4% 130 1% 140 1% 655 6%

2009-10 Not Irrigated (ha) % 65 1% 250 2% 110 1% 120 1% 545 5%

Areas not irrigated are in the low river salinity impact zones; LIZ 1, LIZ 2 and LIZ 3. No areas are in the high salinity impact zone (HIZ). Table 20 – Wemen salinity impact zone of areas not irrigated Salinity impact zone LIZ 1, 2 & 3 HIZ Total

SunRISE 21 Inc.

2005-06 Not Irrigated (ha) % 485 8% 0 0% 485 8%

2007-08 Not Irrigated (ha) % No data

2008-09 Not Irrigated (ha) % 655 6% 0 0% 655 6%

2009-2010 Irrigation Status Report – Private Diverters

2009-10 Not Irrigated (ha) % 545 5% 0 0% 545 5%

Page 23 of 35


Map 6 – Wemen Irrigated/Not Irrigated 2009-10

Robinvale Irrigation District

Robin oa d ak e R S ea L va le -

0

2.5

5

10

Kilometers

¯

Irrigated / Not Irrigated Areas

Hectares

Not irrigated 2009-10 Irrigated 2009-10 Total

SunRISE 21 Inc.

% of Total area 545

5%

9,995

95%

10,540

100%

2009-2010 Irrigation Status Report – Private Diverters

Page 24 of 35


Map 7 – Wemen Irrigation Status 2009-10

Robinvale Irrigation District

Robin oa d ak e R S ea L va le -

0

2.5

5

10

Kilometers

Map 7

¯

2009-10 Status Not Irrigated since 2006-07 Not Irrigated since 2007-08 Not Irrigated since 2008-09 Not irrigated since 2009-10 Irrigated & new or redeveloped since 2006-07 Irrigated since before 2006-07 total

SunRISE 21 Inc.

% of Total area 3%

Hectares 290 205

2%

50

0%

4,560 5,435 10,540

43% 52%

2009-2010 Irrigation Status Report – Private Diverters

See Map 6

5%

NOT Irrigated

95%

Irrigated

100%

Page 25 of 35


4.2

Wemen Change in Irrigated Area

Change in crop type The Wemen river reach irrigated area increased by 4,265 hectares between 2005-06 and 2009-10. New plantings were predominantly almond trees, olive trees and vegetables. Table 21 – Wemen change in irrigated crops Irrigated Crop Grapevine Citrus Perennial Fruit tree plantings Nut tree Other Field crop Seasonal plantings Vegetable Total irrigated Total irrigable area

2005-06 Irrigated (ha) % 950 17% 55 1% 25 0% 2,380 42% 45 1% 75 1% 2,200 38% 5,730 100% 6,215

Change (ha) -110 +15 +915 +3,265 -20 -45 +245 +4,265

2009-10 Irrigated (ha) % 840 8% 70 1% 940 9% 5,645 57% 25 0% 30 0% 2,445 25% 9,995 100% 10,540

Change in irrigation method In the Wemen river reach, drip irrigation increased by 4,185 hectares; from 49% (2,795 hectares) of irrigated crops in 2005-06 to 70% (6,980 hectares) of irrigated crops in 2009-10. In 2009-10, 84% (8,360 hectares) of crops were irrigated with drippers or low level sprinklers. Table 22 – Wemen change in irrigation methods of irrigated crops Irrigation Method Drip Low level Overhead & pivot Furrow & flood Total irrigated

SunRISE 21 Inc.

2005-06 Irrigated (ha) % 2,795 49% 1,345 23% 1,535 27% 55 1% 5,730 100%

2005-06 to 2009-10 change (ha) +4,185 +35 +70 -25 +4,265

2009-2010 Irrigation Status Report – Private Diverters

2009-10 Irrigated (ha) % 6,980 70% 1,380 14% 1,605 16% 30 0% 9,995 100%

Page 26 of 35


5.

Colignan River Reach

5.1

Not Irrigated Area

The Colignan river reach comprises 10,665 hectares of irrigable land; an increase of 235 hectares since 2005-06. In the 2009-10 irrigation season, 18% (1,965 hectares) of the irrigable area was not irrigated. The area not irrigated increased from 6% (620 hectares) in 2005-06 to 18% (1,965 hectares) in 2009-10 as shown in the following table. Table 23 – Colignan not irrigated area Not Irrigated (NI) Perennial Seasonal Total NI Total irrigable

2005-06 Not Irrigated (ha) % 310 3% 310 3% 620 6% 10,430

2007-08 Not Irrigated (ha) % No data

2008-09 Not Irrigated (ha) % 1,095 10% 690 7% 1,785 17% 10,660

2009-10 Not Irrigated (ha) % 1,310 12% 655 6% 1,965 18% 10,665

Areas not irrigated have predominantly had overhead sprinklers. In 2009-10, 6% (635 hectares) of the Colignan river reach had drippers or low level sprinklers but was not irrigated. Table 24 – Colignan irrigation method of areas not irrigated Irrigation Method Drip Low level Overhead Furrow/Flood Total

2005-06 Not Irrigated (ha) % 120 1% 25 0% 305 3% 170 2% 620 6%

2007-08 Not Irrigated (ha) % No data

2008-09 Not Irrigated (ha) % 410 4% 90 1% 1,075 10% 210 2% 1,785 17%

2009-10 Not Irrigated (ha) % 530 5% 105 1% 1,130 10% 200 2% 1,965 18%

Areas not irrigated are predominantly in low river salinity impact zone four (LIZ 4). In 2009, 4% (395 hectares) of the Colignan irrigable area was in the HIZ and not irrigated. Table 25 – Colignan salinity impact zone of areas not irrigated Salinity impact zone LIZ 1 LIZ 4 HIZ Total

SunRISE 21 Inc.

2005-06 Not Irrigated (ha) % 45 0% 415 4% 160 2% 620 6%

2007-08 Not Irrigated (ha) % No data

2008-09 Not Irrigated (ha) % 90 1% 1,335 13% 360 3% 1,785 17%

2009-2010 Irrigation Status Report – Private Diverters

2009-10 Not Irrigated (ha) % 85 1% 1,485 13% 395 4% 1,965 18%

Page 27 of 35


Map 8 – Colignan Irrigated/Not Irrigated 2009-10 Mildura Irrigation District

Calder Highway

Red Cliffs Irrigation District

¯ 0

2.5

5

10

Kilometers

Irrigated / Not Irrigated Area

Hectares

% of total area

Not irrigated 2009-10

1,965

18%

Irrigated 2009-10

8,700

82%

10,665

100%

Total area

SunRISE 21 Inc.

2009-2010 Irrigation Status Report – Private Diverters

Page 28 of 35


Map 9 – Colignan Irrigation Status 2009-10 Mildura Irrigation District

Calder Highway

Red Cliffs Irrigation District

¯ 0

2.5

5

10

Kilometers

Map 9

2009-10 Status Not Irrigated since 2006-07 Not Irrigated since 2007-08 Not Irrigated since 2008-09 Not irrigated since 2009-10 Irrigated & new or redeveloped since 2006-07 Irrigated since before 2006-07 total

SunRISE 21 Inc.

Hectares 505 1,135

% of Total area 5% 10%

325

3%

955 7,745 10,665

9% 73%

2009-2010 Irrigation Status Report – Private Diverters

See Map 8

18%

NOT Irrigated

82%

Irrigated

100%

Page 29 of 35


5.2

Colignan Change in Irrigated Area

Change in crop type The Colignan river reach irrigated area decreased by 1,110 hectares between 2005-06 and 200910. New plantings were predominantly nut trees as shown in the following table. Table 26 – Colignan change in irrigated crops Irrigated Crop Grapevine Citrus Perennial Fruit tree plantings Nut tree Other Field crop Seasonal plantings Vegetable Total irrigated Total irrigable area

2005-06 Irrigated (ha) % 5,530 56% 2,795 28% 220 2% 325 3% 275 3% 85 1% 580 6% 9,810 100% 10,430

Change (ha) -655 -45 -30 +55 -55 -25 -355 -1,110

2009-10 Irrigated (ha) % 4,875 56% 2,750 32% 190 2% 380 4% 220 2% 60 1% 225 3% 8,700 100% 10,665

Change in irrigation method In the Colignan river reach, furrow and overhead irrigation declined by 2,215 hectares; from 39% (3,780 hectares) of irrigated crops in 2005-06 to 18% (1,565 hectares) of irrigated crops in 200910. Drip irrigation increased by 1,215 hectares; from 51% (5,030 hectares) of irrigated crops in 2005-06 to 72% (6,245 hectares) of irrigated crops in 2009-10. In 2009-10, 82% (7,135 hectares) of crops were irrigated with drippers or low level sprinklers. Table 27 – Colignan change in irrigation methods of irrigated crops Irrigation Method Drip Low level Overhead & pivot Furrow & flood Total irrigated

SunRISE 21 Inc.

2005-06 Irrigated (ha) % 5,030 51% 1,000 10% 3,715 38% 65 1% 9,810 100%

Change (ha) +1,215 -110 -2,155 -60 -1,110

2009-2010 Irrigation Status Report – Private Diverters

2009-10 Irrigated (ha) % 6,245 72% 890 10% 1,560 18% 5 0% 8,700 100%

Page 30 of 35


6.

Mildura River Reach

6.1

Not Irrigated Area

The Mildura river reach (private diverters) comprises 1,755 hectares of irrigable land; an increase of 30 hectares since 2005-06. In the 2009-10 irrigation season, 40% (695 hectares) of the irrigable area was not irrigated. The area not irrigated increased from 12% (215 hectares) in 2005-06 to 40% (695 hectares) in 2009-10 as shown in the following table. Table 28 – Mildura private diverters’ area not irrigated Not Irrigated (NI) Perennial Seasonal Total NI Total irrigable

2005-06 Not Irrigated (ha) % 35 2% 180 10% 215 12% 1,725

2007-08 Not Irrigated (ha) % No data

2008-09 Not Irrigated (ha) % 290 17% 270 15% 560 32% 1,730

2009-10 Not Irrigated (ha) % 370 21% 325 19% 695 40% 1,755

Areas not irrigated have predominantly had furrow irrigation. In 2009-10, 17% (290 hectares) of the Mildura private diverters’ irrigable area had drippers or low level sprinklers but was not irrigated. Table 29 – Mildura private diverters’ irrigation method of areas not irrigated Irrigation Method Drip Low level Overhead Furrow & flood Total

2005-06 Not Irrigated (ha) % 5 0% 10 1% 50 3% 150 9% 215 12%

2007-08 Not Irrigated (ha) % No data

2008-09 Not Irrigated (ha) % 45 3% 110 6% 145 8% 260 15% 560 32%

2009-10 Not Irrigated (ha) % 100 6% 190 11% 150 9% 255 14% 695 40%

Areas not irrigated are predominantly in the high river salinity impact zone (HIZ). In 2009, 23% (400 hectares) of the Mildura private diverters’ irrigable area was in the HIZ and not irrigated. Table 30 – Mildura private diverters’ salinity impact zone of areas not irrigated Salinity impact zone LIZ 1 – LIZ 3 LIZ 4 HIZ Total

SunRISE 21 Inc.

2005-06 Not Irrigated (ha) % 100 6%

2007-08 Not Irrigated (ha) %

2008-09 Not Irrigated (ha) % 260 15%

2009-10 Not Irrigated (ha) % 295 17%

No data 115 215

7% 12%

300 560

17% 32%

2009-2010 Irrigation Status Report – Private Diverters

400 695

23% 40%

Page 31 of 35


Map 10 – Mildura Private Diverters’ Irrigated/Not Irrigated 2009-10

Merbein Irrigation District e ld Ca

in ak De

A

nu ve

e

ig rH hw ay

t Hi

Mildura Irrigation District

ay ghw

Red Cliffs Irrigation District

¯ 0

2.5

5

Calder Highway

r St u

10

Kilometers

Irrigated / Not Irrigated Areas Not irrigated 2009-10 Irrigated 2009-10 Total area

SunRISE 21 Inc.

Hectares

% of total area 695

40%

1,060

60%

1,755

100%

2009-2010 Irrigation Status Report – Private Diverters

Page 32 of 35


Map 11 – Mildura Private Diverters’ Irrigation Status 2009-10

Merbein Irrigation District e ld Ca

in ak De

A

nu ve

e

ig rH hw ay

Red Cliffs Irrigation District

¯ 0

2.5

5

Calder Highway

Mildura Irrigation District

y wa i gh rt H u t S

10

Kilometers

Map 11

2009-10 Status Not Irrigated since 2006-07 Not Irrigated since 2007-08 Not Irrigated since 2008-09 Not irrigated since 2009-10 Irrigated & new or redeveloped since 2006-07 Irrigated since before 2006-07 total

SunRISE 21 Inc.

See Map 10

260

% of Total area 15%

315

18%

40%

NOT Irrigated

120

7%

170 890 1,755

9% 51%

60%

Irrigated

Hectares

2009-2010 Irrigation Status Report – Private Diverters

100%

Page 33 of 35


6.2

Mildura Change in Irrigated Area

Change in crop type In the Mildura private diverters’ river reach the irrigated area decreased by 450 hectares between 2005-06 and 2009-10. This was predominantly due to a decline in irrigating of grapevines and field crops as shown in the following table. Table 31 – Mildura private diverters’ change in irrigated crops Irrigated Crop Grapevine Citrus Perennial Fruit tree plantings Nut tree Other Field crop Seasonal plantings Vegetable Total irrigated Total irrigable area

2005-06 Irrigated (ha) % 985 65% 100 7% 30 2% 10 1% 90 6% 240 16% 55 4% 100% 1,510 1,725

Change (ha) -325 -10 -5 0 -15 -115 +20 -450

2009-10 Irrigated (ha) % 660 62% 90 9% 25 2% 10 1% 75 7% 125 12% 75 7% 1,060 100% 1,755

Change in irrigation method In the Mildura private diverters’ river reach, furrow irrigation declined by 115 hectares; from 20% (295 hectares) of irrigated crops in 2005-06 to 17% (180 hectares) of irrigated crops in 2009-10. While the area of drip irrigation declined by 15 hectares, the proportion of crops irrigated with drippers increased from 30% in 2005-06 to 41% in 2009-10. In 2009-10, 53% (565 hectares) of crops were irrigated with drippers or low level sprinklers. Table 32 – Mildura private diverters’ change in irrigation method of irrigated crops Irrigation Method Drip Low level Overhead & Pivot Furrow & flood Total irrigated

SunRISE 21 Inc.

2005-06 Irrigated (ha) % 455 30% 310 21% 450 30% 295 20% 1,510 100%

Change (ha) -15 -185 -135 -115 -450

2009-2010 Irrigation Status Report – Private Diverters

2009-10 Irrigated (ha) % 440 41% 125 12% 315 30% 180 17% 1,060 100%

Page 34 of 35


References Mallee Irrigated Horticulture 1997 to 2009, SunRISE 21, February 2010. 2009-10 Irrigation Status Report, Pumped Irrigation Districts, SunRISE 21, June 2010.

SunRISE 21 GIS Team Sue Argus Julie Hawtin Frann Sette Richard Waters Daniella Tassone Ron Dudley

SunRISE 21 Inc. A0043653B ABN 81 397 614 997 54 Lemon Ave WEMEN VIC 3500 PO Box 997 WEMEN VIC 3502 Phone: 03 5023 7355 Email: mapping@sunrise21.org.au www.sunrise21.org.au

SunRISE 21 Inc.

2009-2010 Irrigation Status Report – Private Diverters

Page 35 of 35


Mallee Catchment Management Authority www.malleecma.vic.gov.au PO Box 5017 Mildura 3502 Telephone 03 5051 4377 Facsimile 03 5051 4379

2010 Status Report - Private Diverters  

This report was commissioned by the Mallee Catchment Management Authority (Mallee CMA) to capture baseline information for the next five yea...

Read more
Read more
Similar to
Popular now
Just for you