The graduation thesis addresses the subject of elaborating an efficient flushing program for the water distribution system of Šmartno ob Paki. Due to the occurrence of material deposition at low velocity sections in a water distribution system there is a constant risk of water discoloration. There are several methods available for coping with the accumulated material and its management, to prevent the occurrence of water discolouration. From the reviewed methods, I have chosen the method of unidirectional flushing. This method has proven to be most efficient, according to literature sources, and cost-effective in removing accumulated material and its prevention against water discoloration occurrence. The essence of this method is a systematic approach towards planning, implementing and documenting of flushing operations, which does not leave many factors to coincidence. Within the graduation thesis, I have performed a study of the Šmartno ob Paki water distribution system. I have updated the hydraulic model of the mentioned water distribution system using the Aquis water network simulation software. An efficient flushing program for a problematic part of the Šmartno ob Paki water distribution system was elaborated by means of this hydraulic model and the use of the unidirectional flushing method.