ABSTRACT
136Present research was defined for investigation of leakage points in the water distribution network in order to reduce the real case amount of non-revenue water (NRW). In this research, the Relationship Class between the spatial data and non-spatial data is a tool for communication between coordination of water system elements related to NRW data. Therefore the relationship class for water system elements is affected according to the type of connection (simple or complex) and this method provides the access to the leakage points. Hence in this research the hydraulic model of non-revenue water for analysis of water loss was defined in compliance with geographical information system (GIS) and by WATERGEMS8.2 software under management of ArcGIS9-ArcMap9.3 software. The results of this research lead to reduction of the amount of NRW.
