Essential Elements of EIA

1. Identification of possible positive or negative impacts of the project.
2. Quantifying impacts with respect to common base.
3. Preparation of mitigation plan to offset the negative impacts.

Methods of Assessment

Environmental Impact Value (EIV)= Σ  (V_i) W_i

Vi = Relative change of the environmental quality of parameters

Wi= Relative importance or weight or parameter

N = total number of environmental parameters

Quantification of Environmental Impact

Changes of environmental parameters

a) Severe (+5 or -5)

b) Higher (+4 or -4)

c) Moderate (+3 or -3)

d) Low (+2 or -2)

e) Very Low (+1 or -1)

1. f) No change (0)