Enayam Port

Tamil Research Institute
RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR
DEVELOPMENT OF COLACHEL PORT AT TAMILNADU
FINAL REPORT
Estimated adverse impacts on each alternative
5.3.3.2. Sensitivity analysis
Table 7: Estimated adverse impacts on each alternative
With these values, we proceed to achieve a global impact magnitude value for each of the alternatives. That
alternative scoring a lesser gross-magnitude impact value would be the better in terms of environmental and
social feasibility.
To obtain that final impact value for each of the alternatives, based on different weightings of the estimated
impacts values, we considered three different scenarios in order to evaluate the performance of the alternatives in
each of them. These are the following:
• Environmental and social factors weight the same. 50%-50%
• All the environmental and social sub-factors weigh the same, i.e. all the adverse impacts weight the same.
• A different weight is given to factors and sub-factors, i.e. to the adverse impacts, based on an expert
judgement.
To carry out this sensitivity analysis, first we proceed to normalize (homogenization) the impact values, converting
them into a 0-100 range, the highest value corresponding to the negative impact of greater magnitude and
therefore the lower valuation of the alternative. The results of the homogeneous evaluation are showed in the
following table:
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