design of water distribution network for different purposes can be considered as engineering application aspects in civil engineering , as a result, many research have been done in scope.
in this research, this case study of water distribution network , it is closed pipe network (Rusafa WDS as a case study) by using same diameter for all pipes of network in some of zones that are be determined by engineer, so that water supply from pumps or reservoir can be distributed in homogeneous way.
analysis of water distribution systems is required a lot of calculations, so it is necessary to use computer program for analysis these network by using (pipe ++ ) program version 2002, (nodal method- hardy cross method).