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RELIABILITY ASSESSMENT OF A WATER SUPPLY SYSTEM IN CONDITIONS OF LOW WATER LEVELS IN THE DAM
Abstract
The present article assesses the reliability of a water supply system that is fed by one of the large dams in Bulgaria and supplies water to three large settlements in the northeastern part of the country. The system consists of a water main with a length of about 25 km and three pumping stations. For each of the settlements that are supplied by this water supply system, the water has to be pumped by pumping stations to the pressure reservoirs. In recent years, the region has been experiencing significant drought, which is the main reason for the low water level in the dam. This sequentially creates difficulties in the operation of the system. Due to the relatively complex water supply system and the use of pre-pressure from the pumps, there are frequent cases of inability to ensure the normal operation of the pumping stations. These problems are exacerbated in conditions of decreasing water level in the dam. To evaluate the performance of the system, a hydraulic model of the water supply system was created in the Epanet 2.2 software. This paper examines cases of different operating modes of the pumps in the three pumping stations and assesses the reliability of the system under different scenarios for the water level in the dam - from maximum elevation 188 meters to the minimum elevation of 168 meters. Some recommendations were made regarding the possibilities for operation and maintenance of the water supply system in terms of the pumping stations operating mode in order to provide the necessary quantities of water for the three settlements.
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References9
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