The purpose of this study was to assess the environmental risk of Balarood Dam in Iran at constructional phase. The scientific methods used in this research were the Environmental Failure Mode and Effects Analysis (EFMEA) and VIKOR. In the process of environmental risk assessment, the EFMEA method was used first to calculate the risk priority number (RPN) for each environmental aspect. The identified risks were ranked based on RPN values in the next stage. Comparison of the RPN values showed that the risk of pollution of Balarood River, with a RPN of 125, is in the first priority. In addition, the environmental risks, identified during the follow-up phase, were weighted by entropy method based on severity, occurrence probability, and extent of pollution.Then, the VIKOR method, as one of the multicriteria decision-making (MCDM) methods, was run to evaluate and prioritize the potential environmental risks. The risk of water pollution under high, medium and low conditions, with a weight of 1,300, 1,000 and 700, was identified as the most important risk of dam construction. Accordingly, the most important corrective action, proposed to mitigate the high priority environmental risks, is to prevent the discharge of sanitary and industrial wastewater into the river.

这项研究的目的是评估在建设阶段伊朗Balalaod大坝的环境风险。本研究中使用的科学方法是环境破坏模式和影响分析（EFMEA）和VIKOR。在环境风险评估过程中，首先使用EFMEA方法来计算每个环境方面的风险优先级数（RPN）。在下一阶段，基于RPN值对已识别的风险进行排名。RPN值的比较表明，RPN为125的巴拉罗德河的污染风险是第一要务。此外，根据严重程度，发生概率和污染程度，通过熵权法对在后续阶段识别出的环境风险进行加权。然后，VIKOR方法作为多准则决策（MCDM）方法之一，进行评估和优先考虑潜在的环境风险。在高，中，低条件下（分别为1,300、1,000和700）的水污染风险被确定为大坝建设的最重要风险。因此，为减轻高度优先的环境风险而提出的最重要的纠正措施是防止卫生和工业废水排放到河流中。