A survey on a water distribution network with 25% loss shows that 18% of the losses are due to physical losses of the network and the remaining is not a real loss. Fifty percent of physical losses are apparent and reported by people to the water supply agency. The survey result shows that 25% of nonapparent losses could be avoided by low-cost rapid surveys on the system. Determine the efficiency of this water supply system through estimation of different leakage indices.