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http://dx.doi.org/10.5389/KSAE.2014.56.4.069

Evaluation of flood control capacity of agricultural reservoirs during flood season  

Jang, Ik Geun (한국농어촌공사 화안사업단)
Lee, Jae Yong (충북대학교 농업생명환경대학 지역건설공학과)
Lee, Jeong Beom (충북대학교 농업생명환경대학 지역건설공학과)
Kim, Jin Soo (충북대학교 농업생명환경대학 지역건설공학과)
Publication Information
Journal of The Korean Society of Agricultural Engineers / v.56, no.4, 2014 , pp. 69-75 More about this Journal
Abstract
We investigated flood control capacity of 484 agricultural reservoirs with storage capacity of over 1 million $m^3$ in South Korea. In general, agricultural reservoir secures flood control capacity by setting up limited water level during flood season from late June to mid-September. The flood control capacity of an agricultural reservoir during flood season can be divided into stable flood control capacity during non-flood season, stable flood control capacity associated with limited water level, and unstable flood control capacity associated with limited water level. In general, the flood control capacity significantly (P < 0.001) increased with reservoir capacity irrespective of type of spillway. The unstable flood control capacity accounted for about 20 % of reservoir capacity in the uncontrolled reservoirs. The study reservoirs showed flood control capacity of 0.60-65 billion (B) $m^3$ and stable flood control capacity of 0.43-47 B $m^3$, depending on the upper and lower limited water levels during the flood season. The stable flood control capacity of the gated reservoirs (0.29-0.33 B $m^3$) was about two times than that of reservoirs with uncontrolled spillways (0.14 B $m^3$). The ratios of stable flood control capacity to reservoir capacity for agricultural reservoirs range from 21 to 23 %, similar to that for Daecheong multipurpose dam. Moreover, the reservoirs with over 100 mm ratio of flood control capacity to watershed area accounted for 38 % of total gated reservoirs. The results indicate that many agricultural reservoirs may contribute to controlling flood in the small watersheds during the flood season.
Keywords
Reservoir capacity; Stable flood control capacity; Gated reservoir; Uncontrolled spillway;
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