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This April 5th dam and Hwanggang dam, which are located in Imjin river, North Korea, become the main causes of water shortages and damages in Imjin river downstream. April 5th dam is assumed a small or medium-sized dam, its total storage volume reaches about 88 million ㎥ . And Hwanggang dam, multi-purposed dam of total storage volume approximately 0.3 billion ㎥ to 0.4 billion ㎥ is used as source of residental or industrial water in Gaeseong Industrial Complex. North Korea, which has April 5th dam and Hwanggang dam in Imjin river, manages water of approximately 0.39 billion ㎥ to 0.49 billion ㎥ directly. As water is storaged or discharged through dam, it causes a severe damage to areas in Yeoncheon-gun and Paju city, South Korea. Therefore, this study intends to analyze and estimate runoff through dam construction by using hydrological observation data and artificial data such as service water supply and agricultural water in Imjin river, water shortage and damage correctly. Key Words

Runoff Estimation of Imjin River Basin through April 5th Dam and Hwanggang Dam Construction of North Korea