Many Dams have been constructed in different countries. Dams, in spite of having some socio-economic benefits, cause irreparable environmental damages. Environmental Risk Assessment analyses risks by ranking or comparing them with target values (Functional goals or Legal Requirements) in decision making process. Risk Assessment includes identification of affected Environment, Spatial-temporal Modeling, assessment of main ecological components, estimating risks quantity and comparison with existing criteria. The aim of this study is introducing a method for dam risk assessment that calculates Risk Levels, based on criteria such as cost, time, resources and experts` opinion, and could achieve proposed control mechanisms for reducing the risk level of dam construction activities. In this case, earthquake risk in the location of Ekbatan dam was studied. For this study, Environmental risk coefficient was calculated by multiplying three factors: Impact Range, Probability of Occurrence, and Environmental Degradation. To prioritize and weight the effects of criteria, Analytic Hierarchy Process (AHP) was used. According to the results, the first priority in management strategies was “Education of downstream society to implement emergency action plans” with the final weight of 0.7155. “Education of strategies and actions for emergencies conditions” with the final weight of 0.2364, “Completing Earthquake forecasting supplies and equipment to avoid sudden attacks” with the final weight of 0.1989, “Preparation of equipments, affairs and supports to help in emergency situations”, and “Construction downstream detention and checking structures” were the next priorities.
