ANALYSIS OF WATER LOSS IN SEMARANG MUNICIPAL WATERWORKS

Losses of water in Municipal Waterworks (MW) in Indonesia have in a serious problem. Based on data that released in 2009 by Directorate General of Housing Ministry of Public Works Republic of Indonesia, the rate losses of water at national level have reached 37%. This figure has much influence to the ability of MW to supply water to the consumers. The more of losses of water occur, the more the ability of MW to supply water slackens. The objective of this research is to make model of losses of water as well as to know about the volume of losses of water. WB-EasyCalc 1.07 software was used to analyze model. Analysis has been done by reading the graph of water balance resulted from the model. In addition, the ratio between value of non-revenue water that available in the past and reliable field data has also needed. Field data was taken from observation and by using questioner method, where as respondent was the technician of MW and the consumers. The result of the model was a water balance. Based on 2009 water balance, Semarang has 57.4 % non-revenue water and losses of water were 30.55 % and represent the higher percentage of losses of water. The main factor of losses of water that was the water pipes were worn out. Utilization of water balance to control the rate of losses of water was in a great demand for MW to monitor efficiency of their system