Appraising the Amount of Paddy Irrigation Intake from Busa Estuary Reservoir s Pumping Stations

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1 한국관개배수논문집제 19 권제 2 호 KCID J. Vol. 19 No. 2 ( ) pp. 81~88 Appraising the Amount of Paddy Irrigation Intake from Busa Estuary Reservoir s Pumping Stations 노재경 * 이재남 ** Jaekyoung Noh Jaenam Lee Abstract Using irrigation water from Sohwang and Jungsan pumping stations in Busa estuary reservoir during 2009 to 2011, daily paddy irrigation requirements by modified Penman equation were compared and their applicability was appraised for appropriate reservoir operation and irrigation management. Annual irrigation requirements of Busa irrigation field with 1,411 ha were estimated to 10~17.24 M. Those of Nampo with 496 ha were 5.19~5.97 M. Annual pumping amount of Busa were M and compared with estimated requirement of M on average. Nampo case showed 7.17 M, 5.46 M, respectively. Also daily graphical comparison showed an allowable appropriateness. But monthly comparisons showed 28% below 30% in relative error on Busa, and 33% on Nampo. Therefore it was concluded to intake irrigation water from Busa pumping stations with more or less different amounts compared with planned irrigation requirements. And a discrepancy between planned and operated irrigation water can be ascertained. Ⅰ * 충남대학교지역환경토목학과교수, 교신저자 (jknoh@cnu.ac.kr) ** 충남대학교지역환경토목학과박사수료 (melody_jn@nate.com) 키워드 : Paddy irrigation requirement, Pumping water data, Irrigation plan, Water management

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3 Table 1. Land Uses Within Watershed Watershed Watershed Area Paddy Upland Land Use(ha) Forest Water Resident Busa Estuary 2,847 2,318 5, ,440 Reservoir (22.9%) (18.6%) (46.7%) (3.6%) (5.4%) (2.7%) Boryeong 1, , ,360 Dam (11.5%) (5.7%) (76.6%) (3.0%) (1.0%) (2.2%) 2,847 2,318 5, Total 28,800 (16.4%) (11.3%) (63.7%) (3.2%) (2.9%) (2.4%) Other Ⅱ. Fig. 1. Watersheds of Busa Estuary Reservoir and Boryeong Dam

4 Table 2. Irrigated Paddy Area from Busa Estuary Reservoir Region Nampo Busa Back Other Total Remarks Area(ha) ,900 Other: Outside Area Fig. 3. An Example of Daily Weather Data (Boryeong, 2011) Fig. 2. Irrigated Area from Pumping Stations in Busa Estuary Reservoir

5 Ⅲ. Fig. 4. Daily Estimated Paddy Irrigation Water of Busa Area ( ) Fig. 5. Daily Estimated Paddy Irrigation Water of Nampo Area ( )

6 Table 3. Comparison of Monthly Pumped Water and Estimated Paddy Irrigation Water (Busa, ) (10 4 m3 ) Year Item Month 4 5 Pumped Q (PQ) , Estimated Q (EQ) , PQ-EQ Pumped Q (PQ) , Estimated Q (EQ) , PQ-EQ Pumped Q (PQ) , Estimated Q (EQ) , PQ-EQ Total Table 4. Comparison of Monthly Pumped Water and Estimated Paddy Irrigation Water (Nampo, ) (10 4 m3 ) Year Item Month 4 5 Pumped Q (PQ) Estimated Q (EQ) , PQ-EQ Pumped Q (PQ) Estimated Q (EQ) , PQ-EQ Pumped Q (PQ) Estimated Q (EQ) , PQ-EQ Total

7 Fig. 6. Daily Comparison Between Estimated Paddy Irrigation Water and Pumped Water ( ) IV.

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