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Appendix 4: Irrigation

Table 4: Contribution to farmgate GDP from the supply of irrigation water [In 2003/04 dollars, only water bodies with an irrigation value of greater than $5 million are included.]

Region Water body Current irrigated area (ha) Farmgate GDP generated ($ million per annum) Farmgate GDP generated ($/ha per annum)
Hawkes Bay Heretaunga Plains 13,000 79 6,065
Marlborough Wairau catchment 15,075 72 4,802
Canterbury Rangitata River 57,474 63 1,103
Canterbury/Otago Waitaki River 46,060 57 1,238
Canterbury Central Canterbury ground water 56,900 55 963
Canterbury Mid Canty ground water 50,015 39 779
Northland Waipapa catchment 1,450 25 17,110
Canterbury Waimakariri River 11,000 22 1,996
Canterbury Waiau River 16,500 21 1,297
Hawkes Bay Tukituki/Ruataniwha Plains 3,500 18 5,258
Canterbury Opihi River 23,510 17 705
Tasman Waimea catchment 4,798 16 3,294
Otago Manuherikia River 17,320 15 842
Tasman Moutere catchment 1,909 13 6,748
Otago Clutha River 9,520 11 1,185
Hawkes Bay Ngaruroro catchment 4,800 11 2,303
Otago Taieri River 10,000 8 781
Canterbury Rakaia River 4,100 8 1,834
Canterbury Ashburton River 6,386 7 1,103
Canterbury Hurunui River 4,000 7 1,655
Tasman Motueka catchment 2,160 5 2,529

Table 5: Potential net contribution to gross domestic product at the farmgate from new irrigation development

Region Water body Potential irrigated area (ha) Farmgate GDP generated ($ million per annum) Farmgate GDP generated ($/ha per annum)
Hawkes Bay Tukituki/Ruataniwha Plains 31,500 116 3,676
Canterbury/Otago Waitaki River 136,400 115 843
Canterbury Rakaia River 107,200 74 688
Canterbury Hurunui River 80,000 68 850
Marlborough Wairau catchment 13,000 53 4,094
Canterbury Rangitata River 18,000 22 1,203
Tasman Waimea catchment 3,400 19 5,525
Canterbury Waimakariri River 16,800 14 841
Wellington Ruamahanga catchment 6,000 11 1,821
Tasman Motueka catchment 1,600 7 4,673
Otago Taieri River 5,000 4 860
Otago Manuherikia River 3,500 4 1,054
Canterbury Opihi River 3,200 2 599
Total   425,600 509 1,195