농업용 저수지의 가능최대홍수량 설계를 위한 하류부 피해 산정 방안 적용성 분석
Analysis of the Applicability of Damage Assessment Methods for Downstream Impact Based on Probable Maximum Flood Design in Agricultural Reservoir
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The Korean Rural Community Corporation (KRC) classifies Ⅰ reservoirs as those with storage capacities of 300,000 m³ or more, requiring safetyinspections, detailed diagnostics, and seismic performance evaluations. Despite these standards, Typhoon Hinnamnor in 2022 caused slope collapses inWangsin Reservoir (1.83 million m³), triggering emergency evacuations downstream. Revised 2023 design standards mandate the design flood as themaximum of 200-year probability flood, historical maximum flood, or regional maximum flood, with adjustments for fill dams and areas with severepotential damage. However, application methodologies and foundational data remain insufficient, especially for assessing human and material damage. This study analyzed floodplain maps from Emergency Action Plan for 242 reservoirs, using K-FRM to estimate damages by human, urban, agricultural,and public categories. Correlation analyses indicated limited relationships between reservoir specifications and damages, suggesting external factors likeurbanization and soil conditions play significant roles. Evaluation of fatalities revealed inconsistencies in reservoir classification based on statisticalcriteria. Adopting international standards, such as applying PMF for cases with fatalities, could enhance practicality and ensure policy alignment. Thestudy emphasizes fatalities and injuruies as a primary metric for PMF application, supported by material damage as a supplementary factor, providinga basis for revising guidelines and improving agricultural reservoir resilience.
Abstract
The Korean Rural Community Corporation (KRC) classifies Ⅰ reservoirs as those with storage capacities of 300,000 m³ or more, requiring safetyinspections, detailed diagnostics, and seismic performance evaluations. Despite these standards, Typhoon Hinnamnor in 2022 caused slope collapses inWangsin Reservoir (1.83 million m³), triggering emergency evacuations downstream. Revised 2023 design standards mandate the design flood as themaximum of 200-year probability flood, historical maximum flood, or regional maximum flood, with adjustments for fill dams and areas with severepotential damage. However, application methodologies and foundational data remain insufficient, especially for assessing human and material damage. This study analyzed floodplain maps from Emergency Action Plan for 242 reservoirs, using K-FRM to estimate damages by human, urban, agricultural,and public categories. Correlation analyses indicated limited relationships between reservoir specifications and damages, suggesting external factors likeurbanization and soil conditions play significant roles. Evaluation of fatalities revealed inconsistencies in reservoir classification based on statisticalcriteria. Adopting international standards, such as applying PMF for cases with fatalities, could enhance practicality and ensure policy alignment. Thestudy emphasizes fatalities and injuruies as a primary metric for PMF application, supported by material damage as a supplementary factor, providinga basis for revising guidelines and improving agricultural reservoir resilience.