Unexpected events such as floods, and development interventions such as dams, and civil structures have effects and risks that cause damages. They bring irreparable harm. The development interventions that are built in the riverbeds and flood-prone areas simultaneously suffer from the effects and damages of the flood and intensify the social effects. Social impact assessment (SIA) and social risk assessment (SRA) and evaluating the effects of such events and interventions creates a better insight in project management, and the combination provides the basis for the development of the application of social assessments. makes Using theoretical literature, interviews with experts and qualitative method of data analysis, this research makes the common denominator of evaluating the effects and social risks of flood as the basis of the research and identifies its social effects and possibilities. pay The results of the research show that the effects and probabilities that are classified in demographic indicators are from the highest intensity and the longest duration of the negative social effect/possibility, and on the other hand, the indicators of social protection, risk management and activation. Formal and informal groups and institutions have the highest intensity and the longest duration of positive social effect/probability caused by floods.