The ILI, developed by the IWA (International Water Association), has been used in many countries as an indicator of water leakage. In Korea, the revenue water has been used as a performance indicator for waterworks although there is an opinion to replace it with the ILI. Hence, it has been necessary to investigate whether the ILI can replace the revenue water in Korea. The four main operating indicators (i.e., water service population, profit-loss ratio, fiscal self-reliance, and aged pipe rate) of 162 Korean waterworks were compared with the ILI with the linear regression method. Local water authorities with more than 1 million water service population, with more than 60% profit-loss ratio, more than 40% and less than 60% fiscal self-reliance, and more than 20% aged pipe rate showed meaningful correlation between the four parameters and the ILI. In the remaining cases, their correlations were little or weak. This means that using the ILI may not be an efficient method to represent the performance of the water supply system in Korea because of the lack of UARL (Unavoidable Annual Real Losses) data accuracy. To use the ILI in Korea, it will be required to carry out an additional research to accumulate reliable CARL (Current Annual Real Losses) and UARL data in the future.

ABSTRACT
1. 서 론
2. 연구방법
    2.1 ILI 산정
    2.2 지자체의 특성별 그룹화
    2.3 상관관계 분석
3. 결과 및 토론
    3.1 수도사업자의 4대 지표와 ILI의 관계 분석
    3.2 급수인구 그룹별 3대 주요 인자와 ILI의 상관관계
    3.3 요금 현실화율 그룹별 3대 주요 인자와 ILI의 상관관계
    3.4 재정자립도 그룹별 3대 주요 인자와 ILI의 상관관계
    3.5 경년관 비율 그룹별 3대 주요 인자와 ILI의 상관관계
    3.6 ILI와 4개 지표의 상관성 검토
4. 결 론
References

• 전승희(단국대학교 토목환경공학과) | Seunghui Jeon (Civil and Environmental Engineerin, Dankook University)
• 현인환(단국대학교 토목환경공학과) | Inhwan Hyun (Civil and Environmental Engineerin, Dankook University)
• 김두일(단국대학교 토목환경공학과) | Dooil Kim (Civil and Environmental Engineerin, Dankook University) Corresponding author