Due to global climate change, mega-droughts have occurred frequently. Since long-term droughts make it difficult to secure the water resources, water supply needs to be restricted in a reasonable manner. In the event of limited water supply, the waterworks need to develop a restricted water supply strategy. This study showed that analyzing daily water supply could be used to respond to the first stage of a drought. According to an analysis of Korea's major water authorities, there was about 7~21% of room for daily minimum water supply in case of a drought. Restricting the water supply by lowering pressure is a good strategy for local water authorities with high water leakage rate since leakage is inversely dependent with pressure. For this method, it is necessary to quantify water deficiency and pressure at each node using a simulation. Since DDA-based software is not possible to predict changes in demand at nodes with pressure reduction, WaterGEMS, a PDA software, was used to quantitatively predict water shortages and pressures at each node. Locations where water is deficient need to install booster pumps or to be dispatched with water tank truck and bottled water. Without these support, lowering pressure could not be an option for water works. This paper suggests a method for waterworks to plan a drought by lowering pressure to restrict water supply using daily water supply analysis and PDA based simulation.

ABSTRACT
1. 서 론
2. 연구 방법
    2.1 연구 대상 지역
    2.2 소프트웨어
3. 결과 및 토론
    3.1 1일 급수량 변동 분석을 통한 초기 가뭄 대처 계획 수립
    3.2 시뮬레이션을 이용한 가뭄단계별 감압밸브에 의한 제한급수 검토
4. 결 론
References

• 남영욱(도쿄도립대학교 토목환경공학과) | Youngwook Nam (Department of Civil and Environmental Engineering, Tokyo Metropolitan University)
• 김경수(단국대학교 토목환경공학과) | Kyungsu Kim (Civil and Environmental Engineering, Dankook University)
• 현인환(단국대학교 토목환경공학과) | Inhwan Hyun (Civil and Environmental Engineering, Dankook University)
• 김두일(단국대학교 토목환경공학과) | Dooil Kim (Civil and Environmental Engineering, Dankook University) Corresponding author