Zone Name:	Eyre	Status:	(Yellow)
Allocation Limit:	81.3 million m3/yr	Valid date:	23rd January 2004
Order of Approach:	First (15% of average annual rainfall)

Recharge component

Method of estimation

Background notes

While there is an excess allocatable volume in this area based on rainfall only, historically development has been confined to a shallow thin upper aquifer which is subject to yield declines in dry years, and is somewhat dependent on annual flow in the Eyre River. Development of the Waimakariri Irrigation Scheme (WIS) in the area seems to be adding to the reliability of this aquifer, while there is also increasing development of deeper aquifers.

Apparent anomalies in rainfall recharge estimates in the western part of this zone have prompted Environment Canterbury to stay with the 1st Order approach for this Zone while data is reviewed.

Other available information sources

These reports may be used to provide a full description of groundwater resources in this area. They may include information that will be of use in a consent application, but are not necessarily a comprehensive list.

• Aitchison-Earl, P., Davey, G., Ettema, M., McKerchar, A., Scott, D., Smith, E., and Weeber, J. 'State of the Canterbury Region Water Resource October 2004' (pdf 3.83 MB), U04/101
• Bowden, M.J., et al. 1982: The Water Resources of the Ashley Catchment. North Canterbury Catchment and Regional Water Board, Christchurch, New Zealand. 176p.
• Brown, L. J, 2000, 'Groundwaters of the Canterbury Region' Environment Canterbury Report R00/10.
• Cowie, 1986, "Waimakariri River and Catchment Resource Survey", North Canterbury Catchment Board and Regional Water Board.
• Earl, P. L.,1997, The Hydrogeology of the Eyre River Aquifer and its Influence on Spring Occurrence and Distribution, unpublished M.Sc. thesis, University of Canterbury.
• Sanders, R., 1996, Effects of Groundwater Abstractions on Surface Water Flows in the Lower Waimakariri River and it Tributaries, CRC Report No. R96/1, ISBN 1-86937-292-1.
• Sanders, R., 1997, Groundwater of the Waimakariri-Ashley Plains, Report No. U97(43), Canterbury Regional Council.
• Wilson, D.D.,1989, 'Quaternary geology of the Northwestern Canterbury Plains, New Zealand Journal of Hydrology (New Zealand) 24(1):32-44

Allocation history

Effective allocation

 30 August 2010

Effective Allocation (million m³): 80.35
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 99%

 3 May 2010

Effective Allocation (million m³): 79.40
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 98%

 11 January 2010

Effective Allocation (million m³): 78.04
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 96%

 3 November 2009

Effective Allocation (million m³): 76.91
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 95%

6 July 2009

Effective Allocation (million m³): 70.58
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 87%

2 June 2009

Effective Allocation (million m³): 70.56
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 87%

2 March 2009

Effective Allocation (million m³): 70.51
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 87%

9 February 2009

Effective Allocation (million m³): 70.44
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 87%

1 December 2008

Effective Allocation (million m³): 70.12
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 86%

3 November 2008

Effective Allocation (million m³): 69.83
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 86%

11 August 2008

Effective Allocation (million m³): 69.84
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 86%

7 July 2008

Effective Allocation (million m³): 69.81
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 86%

9 June 2008

Effective Allocation (million m³): 68.07
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 84%

12 May 2008

Effective Allocation (million m³): 67.89
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 84%

31 March 2008

Effective Allocation (million m³): 65.50
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 81%

3 March 2008

Effective Allocation (million m³): 66.09
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 81%

4 February 2008

Effective Allocation (million m³): 64.68
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 80%

3 December 2007

Effective Allocation (million m³): 61.33
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 75%

5 November 2007

Effective Allocation (million m³): 61.20
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 75%

1 October 2007

Effective Allocation (million m³): 61.19
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 75%

3 September 2007

Effective Allocation (million m³): 61.20
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 75%

23 July 2007

Effective Allocation (million m³): 61.15
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 75%

7 May 2007

Effective Allocation (million m³): 60.29
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 74%

19 February 2007

Effective Allocation (million m³): 60.17
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 74.01%

5 December 2006

Effective Allocation (million m³): 59.77
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 73.52%

9 October 2006

Effective Allocation (million m³): 59.40
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 73.07%

18 September 2006

Effective Allocation (million m³): 59.35
Reason for Change: Consents update
Source: Consents database live-read
Proportion Allocated: 73%

29 June 2005

Effective Allocation (million m³): 56.67
Reason for Change: Effective allocation recalculated using a revised table of irrigation standards to address concerns with Schedule WQN9 of Chapter 5 NRRP, as approved by the Water Allocation Panel
Source: Consents database live-read on 29 June 2005
Proportion Allocated: 70.00%

29 October 2004

Effective Allocation (million m³): 56.26
Reason for Change: Consents update
Source: Consents database
Proportion Allocated: 69.20%

6 August 2004

Effective Allocation (million m³): 55.98
Reason for Change: Consents update
Source: Consents database
Proportion Allocated: 68.86%

11 June 2004

Effective Allocation (million m³): 53.49
Reason for Change: Consents update
Source: Consents database
Proportion Allocated: 65.79%

23 January 2004

Effective Allocation (million m³): 50.1
Reason for Change: This is the first estimate made
Source: Report U04/02 (Table 6.2)
Proportion Allocated: 61.62%

Allocation limit

23 January 2004

Allocation Limit (million m³): 81.3
Reason for Change: This is the first estimate made using the 1st Order Approach
Source: 1st order Report U04/02 (Table 6.2)