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G/W assessment tool (NZ)

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Risk Characterisation

Groundwater Site Risk Assessment Tool (NZ)

The factors used in the DRASTIC vulnerability mapping system have been adapted and extended to provide a more relevant system to determine the risk of the transport of contaminants through the sub-soils and underlying groundwater aquifers. See Part 2 of Contaminant Mobility report

The factors are then combined in a unique way which bears minimal relationship with DRASTIC � for instance, instead of being added after weighting, the factors in the new model are multiplied together to reflect the more dramatic effects that specific circumstances � such as preferential flow paths caused by construction activities, drains etc - can have on the potential for transport of contaminants. Additionally, added factors cannot allow a null result, when for instance, the aquifer at risk is confined under the site and so there is no risk. Multiplied factors allow very small or zero results.

The risk model allows the user to enter a variety of site conditions or parameters and then calculates the likely risk of groundwater contamination for the contaminant in question.

Liability and use of this information - Please read