홍수기 농업용 저수지의 홍수조절용량의 평가
Evaluation of flood control capacity of agricultural reservoirs during flood season
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초록
We investigated flood control capacity of 484 agricultural reservoirs with storage capacity of over 1 million m3 in South Korea. In general, agricultural reservoir secures flood control capacity by setting up limited water level during flood season from late June tomid-September. The flood control capacity of an agricultural reservoir during flood season can be divided into stable flood controlcapacity during non-flood season, stable flood control capacity associated with limited water level, and unstable flood controlcapacity associated with limited water level. In general, the flood control capacity significantly (P < 0.001) increased with reservoircapacity irrespective of type of spillway. The unstable flood control capacity accounted for about 20 % of reservoir capacity in theuncontrolled reservoirs. The study reservoirs showed flood control capacity of 0.60-65 billion (B) m3 and stable flood controlcapacity of 0.43-47 B m3, depending on the upper and lower limited water levels during the flood season. The stable flood controlcapacity of the gated reservoirs (0.29-0.33 B m3) was about two times than that of reservoirs with uncontrolled spillways (0.14 B m3). The ratios of stable flood control capacity to reservoir capacity for agricultural reservoirs range from 21 to 23 %, similar to that forDaecheong multipurpose dam. Moreover, the reservoirs with over 100 mm ratio of flood control capacity to watershed area accountedfor 38 % of total gated reservoirs. The results indicate that many agricultural reservoirs may contribute to controlling flood in thesmall watersheds during the flood season.
Abstract
We investigated flood control capacity of 484 agricultural reservoirs with storage capacity of over 1 million m3 in South Korea. In general, agricultural reservoir secures flood control capacity by setting up limited water level during flood season from late June tomid-September. The flood control capacity of an agricultural reservoir during flood season can be divided into stable flood controlcapacity during non-flood season, stable flood control capacity associated with limited water level, and unstable flood controlcapacity associated with limited water level. In general, the flood control capacity significantly (P < 0.001) increased with reservoircapacity irrespective of type of spillway. The unstable flood control capacity accounted for about 20 % of reservoir capacity in theuncontrolled reservoirs. The study reservoirs showed flood control capacity of 0.60-65 billion (B) m3 and stable flood controlcapacity of 0.43-47 B m3, depending on the upper and lower limited water levels during the flood season. The stable flood controlcapacity of the gated reservoirs (0.29-0.33 B m3) was about two times than that of reservoirs with uncontrolled spillways (0.14 B m3). The ratios of stable flood control capacity to reservoir capacity for agricultural reservoirs range from 21 to 23 %, similar to that forDaecheong multipurpose dam. Moreover, the reservoirs with over 100 mm ratio of flood control capacity to watershed area accountedfor 38 % of total gated reservoirs. The results indicate that many agricultural reservoirs may contribute to controlling flood in thesmall watersheds during the flood season.
참고문헌 (10)
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