Summarization of Environmental Impact

Assessment Methodology

Dr. I.M. MishraProfessor, Dept. of Chemical Engineering

Dean, Saharanpur Campus

Indian Institute of Technology, Roorkee

By

Summarization of Environmental Impact Assessment

Methodologies• adhoc methods.• map over lays.• impact checklists• impact matrices and• cause-condition-effect networks.

Network Method

Conclusion

identification of impacts measurement of impacts interpretation of impacts communication of results Further, all the methods differ

from one another in one or more

Adhoc Approach to Environmental Impact Versus Environmental Area

Ranking Example for Five Highway Project Alternatives and Eight Impact Areas

Rating Example for Five Highway Projects

Incremental Ranking Example for the Five Highway Project Alternatives and Seven Impact Areas

Summarization of Environmental Impact

Overview of Impact Assessment Methodologies

Illustrative Ad Hoc Approach to Environmental Impact Versus Environmental Area

Illustrative Matrix Approach to Comparing Environmental Impact of Actions on Existing Characteristics and Conditions of the Environment

Impact tree for a hypothetical bank stabilization project.

Illustrative Example of Checklist Approach to Neighborhood Development Project

Ranking Example for Five Highway Project Alternatives and Seven Impact Areas

Rating Example for Five Highway Project Alternatives and Seven Impact Areas

Incremental Ranking Example for Five Highway Project Alternatives and Seven Impact Areas

Rating Example Based on Incremental Rankings for Five Highway Project Alternatives and Seven Impact Areas

Illustrative Example of Weighted Impact on Actions on Existing Characteristics and Conditions of the Environment

Candidate value Curves for Farmland impact

Illustrative Example of the Development of Impact Area Importance Weightings

Example of a value function for dissolved oxygen as a measure of Water quality.

Planning Factors for land Use Configurations

Additional Planning Factors

Determination of Impact Values

Summary of Configuration Environmental Impacts

Network Method

Conceptual framework of impact networks.

Example of impact tree for new freeway const1l1ction in established downtown business district.

(a) Illustrative impact tree (b) corresponding branches

Illustrative Impact Frequency, Magnitude, and Importance Values for New Freeway Construction in a Downtown Area