Almost all proposals present forecast data of the variables in focus and conclude the results. However, some variables such as water can change its volume during the traverse from source to end. Such of these variables need to be studied with loss parameters also. This loss parameter here is leakage water. Water demand forecast can be calculated for the coming years, but leakage water also need to be calculated and then actually delivered water to the end users has to be forecast. This paper proposed a model of piping pattern, leakage locations. Calculated leakage water and forecast the actual delivery of water to end users. On the application side, the results of this paper help administrators take decisions on improving infrastructure of water distributions system and take precautions to care the maintenance of the infrastructure. The ideas and methods presented in this paper can be applied to other projects of similar nature. On the academic research side, this formulation helps further in-depth analysis to be carried out to calculate exact leakage water volumes. Water works departments can also benefit from this research