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In remote areas decisions on the need for remedial and maintenance works on linear projects such as roads and canals may involve the evaluation of risk based on the identification and distribution of definable hazards. A terrain model provides the basis for a classification scheme to enable this to be done cost effectively. In addition it facilitates the identification of problem areas that may require more detailed subsequent design investigation. In the absence of more detailed investigation it provides the basis for a conceptual construction approach.

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