عنوان مقاله [English]
Nan-revenue water (NRW) is one of the most important problems in water distribution networks (WDN). Different method is presented for detection and reduction of NRW. In this paper demands is calibrated using ant colony optimization (ACO). The results have shown the value and location of NRW and big leakages positions. Then, NRW components in different zones is separated with combined MNFA and demand calibration. This method is applied on the WDN of Golbahar. This method has shown the value of background leakage, big leakage and apparent losses. The results showed that the main factor in NRW water loss is physical leakage and pipe fracture. Big leakage, background leakage and apparent losses are 57, 32 and 11 percent of NRW, respectively. Also, the big leaks are located in the zones 1, 5 and 7.
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