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Padma Multipurpose Bridge Project

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Step 4a: Assigning composite rating value to environmental component Composite rating value is based on three variables: the degree, duration and mitigabilityof impact. Criteria for assessing composite value for negative impactsDegree of impact Temporal MitigabilityShort-term Long-term Partially FullyLow (-1) √ √ √Medium (-2) √ √ √High (-3) √ √Criteria for assessing composite value for positive impactsDegree of impactTemporalShort-term Long-termLow (+1)√Medium (+2) √ √High (+3)√Step 4b: Assigning composite rating value to environmental component Composite rating value will vary from 1 to 3 for positive impacts and -1 to -3 for negativeimpacts Criteria for assigning composite rating value for negative impactsComposite Value Degree of Impact Temporal Mitigability-1 Low (-1)Low (-1)Medium (-2)Medium (-2)Short termLong termShort termLong termFull & PartialFull & PartialFull & PartialFull-2 Medium (-2)High (-3)Long termShort termPartialFull & Partial-3 High (-3) Long term PartialCriteria for assigning composite rating value for positive impactsComposite Value Degree of Impact Temporal+1 Low (+1)Low (+1)Mdium (+2)Short termLong termShort term+2 Medium (+2)High (+3)Long termShort term+3 High (+3) Long termStep 5: Computing impact value for environmental component Impact value= weightage value (from Step-1) X composite rating value (from Step-4)4-5

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