The heavy strom of July 26-28, 1996, which occurred over the Northern Kyungi Province and Western Kangwon Province, is analyzed to investigate the hydrometeorological characteristics and frequency of occurrences of the storm. The study region is limited to the watershed area of Hantan River on which the partially destructed Yeonchon Dam is located. Hourly rainfall data at 21 rain gauging stations in and near the Hantan river basin are collected and the cumulative rainfall mass curves constructed and compared each other to judge the credibility and consistency of rainfall data at nearby stations. In order to analyze the spatially moving characteristics of rain storm the isochrones based on real time are constructed using the several fixed-percentage cumulative rainfalls at the stations. The basin average rainfalls of various durations are computed for Yeonchon dam and the return period of July/1996 storm are evaluated based on the rainfall frequency curves at Cheolwon and Yeonchon rain gauging stations. A comparison is also made between the July/1996 storm and PMP of the region, which demonstrated the severity of the heavy storm.
1996년 7월 26일∼28일에 걸쳐 경기북부 및 강원영서 지방에 내린 기록적인 집중호우를 대사으로 연천댐 붕괴의 원인이 된 한탄강유역 호우의 수문기상학적 규모와 발생특성을 분석하였다. 한탄강유역 및 인군에 위치한 21개 우량관측소의 시간 우량자료를 수집하여 지점별, 지속시간별 누가우량곡선을 작성·비교함으로써 호우의 공간적 이동특성을 분석하였다. 또한, 연천댐유역에 내린 지속시간별 유역 평균 연속강우량을 철원 및 연천우량관측소의 빈도우량과 비교하였을 뿐 아니라, 이 지역의 지속시간별 가능최대수량(PMP)과도 비교함으로써 '96년 7월 호우가 이 지역에서는 기왕 최대기록 호우임을 입증하였다.