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http://dx.doi.org/10.3741/JKWRA.2019.52.6.421

Method of estimating exploitable groundwater amount considering relationship between precipitation and recharge and the variation of 10-year minimum precipitation  

Chung, Il-Moon (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology)
Lee, Jeongwoo (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology)
Lee, Jeong Eun (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology)
Kim, Min Soo (Daelim Industrial Co. Ltd.)
Publication Information
Journal of Korea Water Resources Association / v.52, no.6, 2019 , pp. 421-427 More about this Journal
Abstract
The amount of exploitable groundwater amount in Korea has been determined by multiplying the 10-year frequency low precipitation by the recharge rate. In practice, however, the interpretation of the frequency analysis of precipitation is omitted, and the value obtained by multiplying the average recharge rate by the minimum precipitation in the recent 10 years is used as the recharge amount. Therefore, the contradiction arises that the amount of precipitation to be applied is determined according to the period selection rather than the actual low precipitation by the 10-year frequency analysis. In this study, we proposed a method for estimating the exploitable groundwater amount using the recharge amount considering the moving averaged 10-year minimum precipitation and the size of precipitation. This method was applied to the Uiwang, Gwacheon and Seongnam areas and the exploitable groundwater amount was calculated and compared with the results obtained by conventional methods. As a result, it has been confirmed that if the 10-year minimum precipitation is selected in the period including the extreme drought, the problem of underestimating the exploitable groundwater amount can be overcome by using the moving average minimum precipitation.
Keywords
Exploitable groundwater amount; Recharge rate; 10 year-frequency low precipitation; Averaged moving 10 year minimum precipitation;
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