טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentRavid Tamar
SubjectReliability and Efficiency in Operating a Water Supply
System with Adjustment to Random Demands
DepartmentDepartment of Civil and Environmental Engineering
Supervisor Professor Emeritus Uri Shamir


Abstract

High quality of service and low costs are the main objectives of operating a water supply system. The quality of service is measured in this work by the ability of the system to supply the required amount of water at sufficient pressure at any time. The probability that the quality of service will be maintained defines the reliability of the system. In order to increase the system’s reliability, there is a need to preserve emergency storage in the reservoirs, which will compensate for loss of pumping capability in case of a failure.

Low cost is achieved by decreasing the cost of electricity consumed by the pumping stations. Using the reservoirs as buffers to shift the pumping from high electricity tariff hours to low ones is one of the most efficient methods to achieve this goal. The more storage is available for performing this shift, the more money can be saved. There is a competition between the above mentioned objectives: on the one hand, high water levels increase the reliability, on the other hand, electricity costs are lowered by emptying the reservoirs at high electricity tariff hours.

This study presents a method to help optimizing the trade-off between high reliability and low costs. A model using a combination of an optimization program and a reliability assessment program is developed to show the implications of deciding upon the operational storage in the reservoirs. An automatic control program is developed to simulate the implementation of the optimization program as a real-time operation tool, handling random demands.