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http://dx.doi.org/10.3741/JKWRA.2004.37.3.249

A Study on Return Flow Ratio of Irrigation for a Paddy Field in Pumping Station by Water Balance Method  

Choo, Tai-Ho (밀양대학교 토목공학과)
Publication Information
Journal of Korea Water Resources Association / v.37, no.3, 2004 , pp. 249-255 More about this Journal
Abstract
To investigate the return flow ratio of irrigation water, lots of observations were made during the irrigation periods in 2003 crop year. This Area is a portion of Dae-Am pumping station basin which is located in Changryung-gun, Gyeongnam province. A water balance analysis was performed for a paddy field in Dae-Am pumping station in the Nakdong river basin, which is constructed for irrigation water supply. Daily rainfall data in the this area were collected and irrigation water flow rate, drainage water flow rate, infiltration and evaportranspiration were measured in field area. Irrigation water flow rate and drainage water flow rate were continuously observed by water level logger(GTDL-L10) during the growing season. The infiltration and evaportranspiration were measured by cylindrical 300mm depletion meter and cylindrical 200mm infiltrometer, respectively. Total irrigation and drainage flows were 654.7mm and 281.2mm in 2003. Total infiltration and evaportranspiration were 36.0mm and 160.0mm respectively. The mean of the daily evaportranspiration rate was 4.3mmm/d. The prompt return flow and retard return flow ratio were 43.0％ and 5.5％, respectively. Total return flow ratio was 48.5％. Therefore, it can be concluded that the amount of irrigation water was much higher than design standard or reference in this study. It means that this was caused by the inadequate water management practice in the area where water was oversupplied on farmers' request rather than following sound water management principles, and design standard should be changed in the future.
Keywords
irrigation water; return flow ratio; irrigation flows; drainage flows; infiltration; evaportranspiration;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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