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Physical or real losses may be indicated as the most important component of the water losses occurring in a water distribution network (WDN). The objective of this study is to examine the effects of piping material management and network rehabilitation on the physical water losses and water losses management in a WDN. For this aim, the Denizli WDN consisting of very old pipes that have exhausted their economic life is selected as the study area. The fact that the current network is old results in the decrease of pressure strength, increase of failure intensity, and inefficient use of water resources thus leading to the application of the rehabilitation program. In Denizli, network renewal works have been carried out since the year 2009 under the rehabilitation program. It was determined that the failure rate at regions where network renewal constructions have been completed decreased down to zero level. Renewal of piping material enables the minimization of leakage losses as well as the failure rate. On the other hand, the system rehabilitation has the potential to amortize itself in a very short amount of time if the initial investment cost of network renewal is considered along with the operating costs of the old and new systems, as well as water loss costs. As a result, it can be stated that renewal of piping material in water distribution systems, enhancement of the physical properties of the system, provide significant contributions such as increase of water and energy efficiency and more effective use of resources. [ABSTRACT FROM AUTHOR]

Reducing non-revenue water (NRW) is one of the most significant strategies for the effective management of water resources. Efforts to reduce NRW and losses are also critical for planning the future budgets of water utilities. In this study, NRW prediction are made by a new approach based on trend and risk calculations based on historical data. Prediction, monitoring, and evaluation of NRW amounts according to specific risk values provide objective planning support for successful and sustainable water management. The relationship between specific risk levels and NRW loss amounts is explained through the model charts. Possible NRW losses for specific risk levels are predicted through 2023. NRW prediction provides advantages for budget balances and sound water utility decision-making, planning, and investment. • A approach suggested for NRW volume calculation with future planning and management activities is developed. • NRW amounts can be predicted by using of numerical method of risk assessment. • A flexible model is put forward by taking into consideration the experiential possibilities for NRW. • It has a probabilistic approach that provides the best projections in terms of the highest probability. • It allows the use of a method that enables the transition to risk vision for determining and estimating of NRW. [ABSTRACT FROM AUTHOR]