제주시 도련지역 상수도 블록시스템 구축에 따른 누수저감 효과 분석

Abstract

The average revenue water ratio is 82.6% in Korea. It is lower than advanced country's revenue water ratio which is over than 90%. This difference between Korea and advanced country can be attributable to leakage in water distribution and supply system. The efficient management in water supply facilities can reduce leakage flow rates. It is very important assignment that can gain several effects. This can reduce development cost of new water resources, destruction of environment, therefore leads to the improvement of management in water supply business. To maintain and manage the water supply system more efficiently, the water distribution block system can be introduced. In this study, the effect of water distribution block system on leakage reduction was investigated by modeling pipe network analysis before and after establishing water distribution block system. The establishment of water distribution block system was verrifed as an economically sound approach based ton economic analysis between leakage reduction and cost of block system establishment. First, study area was selected and the revenue water ratio in study area was estimated. Then estimated revenue water ratio compared with the revenue water ratio in waterworks statistics. Also water distribution block system in study area was planned. Water pressure distributions before and after block system were compared each other. As a result, the effects in leakage reduction and the effects of rising of revenue water ratio were estimated. As a result of pipe network analysis, average water pressure in block system was lower than by controling PRV(Pressure Reducing Valve). Reducing water pressure leaded to leakage reduction. Also economic analysis was conducted and B/C ratio was over 1.0, it was found that block system establishment is economically feasible. Block system is the basis of efficient management of distribution system. So if the revenue water ratio is low, block system must be established preferentially. After establishing block system, the efficient management should be achieved through maintenance and management system.