Rehabilitation of water supply systems

Toğrul, Nevzat
Management of water supply systems by an economic and efficient way is a significant issue for water authorities. Selection and operation of water supply elements appropriately to satisfy water need affects the energy consumption of the system. This study aims to constitute a long term rehabilitation plan for water supply elements (only storage tanks, pumps and transmission line pipes are in the scope of the study). A case study has been performed on N8.3 pressure zone of Ankara water distribution network. By considering different combinations of these water supply elements, 168 different scenarios were created. By using genetic algorithm based software WaterCAD Darwin Scheduler, optimum pump schedules for each scenario were determined within the frame of target hydraulic performance requirements. The energy costs obtained according to these pump schedules were evaluated with the initial investment costs, repair and maintenance costs of the system elements used in the scenarios. A rehabilitation plan was introduced by performing cost analyses within the frame of economic life times of the system elements. The study also shows how the rehabilitation plan can be changed in case of unexpected population growth.


Influence of system parameters on the disinfection capability of water distribution networks /
Koç, Selin; Merzi, Nuri; Department of Civil Engineering (2014)
Adequate municipal water supply for people, is one of the most important signs of civilization. When water is cleaned from unhealthy compounds, the most important point for consumers is completed. Chlorine is used as the most common disinfectant. Some basic parameters which affect water quality are roughness coefficient, wall decay coefficient and bulk decay coefficient; amount of leakage is also effective. Efficiency of the network and water quality are influenced by changing these parameters in a water di...
Chance constrained optimization of booster disinfection in water distribution networks
Köker, Ezgi; Altan Sakarya, Ayşe Burcu; Department of Civil Engineering (2011)
Quality of municipal water is sustained by addition of disinfectant, generally chlorine, to the water distribution network. Because of health problems, chlorine concentration in the network is limited between maximum and minimum limits. Cancerogenic disinfectant by-products start to occur at high concentrations so it is desired to have minimum amount of chlorine without violating the limit. In addition to the health issues, minimum injection amount is favorable concerning cost. Hence, an optimization model ...
Evaluation of performance and optimum valve settings for pressure management using forecasted daily demand curves by artificial neural networks
Yıldız, Evren; Merzi, Nuri; Department of Civil Engineering (2011)
For the appropriate operation and correct short term planning, daily demand curve (DDC) of municipal water distribution networks should be forecasted beforehand. For that purpose, artificial neural networks (ANN) is used as a new method. The proposed approach employs already recorded DDCs extracted from the database of ASKI (Ankara Water Authority) SCADA center and related independent parameters such as temperature and relative humidity obtained from DMI (State Meteorological Institute). In this study, a co...
Leakage optimization of water distribution networks by pressure control
Köker Gökgöl, Ezgi; Altan, Tomris Elvan; Department of Civil Engineering (2018)
Excess water losses from drinking water distribution network is a serious problem in many countries all over the world including Turkey where total water losses is around 40% of the distributed water. Total water losses are divided into two parts namely (i) apparent or commercial water loss and (ii) real or physical water loss. Apparent water loss is from sources such as illegal water usage (water theft), inaccuracy in customer water meters, and meter reading handling errors. Real water loss is from sources...
Spatial data analysis for monitoring and prediction of selected water quality parameters in reservoirs: Porsuk Dam reservoir case
Yenilmez, Firdes; Aksoy, Ayşegül; Düzgün, H. Şebnem; Department of Environmental Engineering (2014)
In the design of a water quality monitoring network, selection of water quality sampling locations is crucial to adequately represent the water quality of the water body when high costs of analyses and field work are taken into account. In this study, a new approach was proposed to identify the representative water quality sampling locations in reservoirs and lakes using geostatistical tools for estimation of spatial distribution of selected water quality parameters. To do so, kernel density estimation (KDE...
Citation Formats
N. Toğrul, “Rehabilitation of water supply systems,” M.S. - Master of Science, Middle East Technical University, 2015.