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River Assessment Method

River Assessment Method. Irrigation Simon Harris and Claire Mulcock. Defining irrigation. No categories No segments Clusters of attributes – supply and demand. Indicators. Existing data, especially reliable, nationally available data Expert panel judgement Problems with:

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River Assessment Method

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  1. River Assessment Method Irrigation Simon Harris and Claire Mulcock

  2. Defining irrigation • No categories • No segments • Clusters of attributes – supply and demand

  3. Indicators • Existing data, especially reliable, nationally available data • Expert panel judgement • Problems with: • Data availability • Feasibility • De novo approach

  4. Aggregate scores • Tried unweighted – too much influence from minor attributes • Soil moisture deficit threshold • Weighted for river size and irrigable area • Secondary weighting for soil moisture, reliability and alternative supply

  5. National, local significance • National significance - size = 3 (>70cumecs), irrigable area = 3 (>100,000 ha) and soil moisture deficit present • Local significance - size = 1 (>5cumecs), irrigable area = 1 (>5,000 ha) or soil moisture deficit not present

  6. Findings • Primarily determined by size of resource, irrigable area where soil moisture deficit present • Likely most nationally significant resources will be in Canterbury • Robust in terms of comparative assessment, but level of discrimination difficult at smaller sized resources

  7. Key concerns • de novo approach • Transfer of water resources across catchments makes individual catchment assessment difficult • Storage alters the profile and importance of a river – ie Ashley and Lees Valley dam. Also difficult to address other than through expert assessment • Lots of data for Canterbury, difficult elsewhere • Standardisation of national/regional/local significance across values

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