Montana district• water supply services – 125 515 people(99%);• sewerage services – 60 620 people(50%);• serviced settlements - 110 224 water sources, divided into 22 groups of water supply, due to three types of networks - gravity, pumping and mixed 74 settlements are supplied by pumping ; 210 groundwater sources- provide about 5-6 million m3 per year 14 catchments including dam "Srechenska bara" provide surface water up to 30 million m3 per year
Water supply system in town of Montana Population of 43 781 inhabitants The source of Montana’s water supply system is water power system "Srechenska bara" from which are supplied 22 settlements in the districts of Vratsa and Montana. Dam "Srechenska bara" is an annual equalizer reservoir with a total volume - 15,5 million m³
Designed water quantities that DWTP ”Slatina”delivers to four directions-Montana, Bercovitsa, Vratsa and Vurshets
Sewerage system in town of Montana Since 2010 a new treatment plant provides complete biological treatment of domestic and industrial wastewater from the town. The capacity of the WWTP has an average daily flow of 17 840 cubic meters of water and organic waste 5920 kg per day. The WWTP is designed to serve a town with 98 000 inhabitants
Vratsa district• water supply services – 197 691 people (99,8%);• sewerage services – 116 637 people (59%);• serviced settlements - 120 226 groundwater sources, divided into 11 groups of water supply, due to three types of networks - gravity, pumping and mixed. They provide about 21 million m3 per year dam "Srechenska bara" provide surface water up to 24 million m3 per year
Water supply system in town of Vratsa Population of 66 916 inhabitants Vratsa is fed mainly by surface water, which derive from the dam “Srechenska bara” and partly by spring water catchments -“Bistrets”, ”Ludoto ezero”, “Medkovets” and others. Water supply network of Vratza is divided into 8 pressure zones corresponding to the number of existing pressure reservoirs
Sewerage system in town of Vratsa Mixed sewage network for waste domestic and storm waters Vratsa has operating waste water treatment plant / WWTP /. It was designed in 1966 - 1970, established in operation gradually during 1980 -1985 Incoming waste water in entrance of the WWTP is considerably higher than the data used for the detailed design of 1968 as average daily flow of 43 133 m3/day 113 l/capita/d is currently the water consumption according to the present water demand 101.7 l / capita/ d are wastewater quantities discharged into sewers from population of the town of Vratza.
Vidin district• water supply services – 112 164 people (99,6%);• sewerage services – 75 149 people (67%);• serviced settlements - 134 60 water sources, divided into 4 groups of water supply, due to three types of networks - gravity, pumping and mixed 89 settlements are supplied by pumping ; 56 groundwater sources- provide about 6 480 087 m3 per year 4 catchments provide surface water up to 938 112 m3 per year
Water supply system in town of Vidin Population of 50 547 inhabitants Town is not supplied by surface water. It is supplied by drinking water from two water catchments zones-"Slanotran’’ and "Kos" . Both zones draw their water from groundwater. PS"Slanotran’’-supplies about 7300 thousand m3 per year PS“Kos’’-supplies about 216 thousand m3 per year
Water supply system in town of Vidin Water supply system of Vidin consists of two water sources with pumping stations, main external water pipeline, external water supply pipelines and distribution network. The system includes a water tower with volume V = 500 m3,which is mainly used to manage water supply system. In the distribution network constant pressure of about 3.2 Atmosphere is maintained and there are no zones of high or low pressure. The town has an extremely flat terrain, which allows precise regulation of pressure in the network
Sewerage system in town of Vidin Sewerage system of Vidin is mixed for domestic waste and storm waters Domestic and storm water is pumped into the Danube through two pumping stations. Presently wastewater treatment plant Vidin is in construction. After its completion it will help preserve the water of the Danube.
CONCLUSIONS Water resources formed in the Northwestern region of Bulgaria are generally sufficient to ensure normal supply of the settlements and the quality of water is good The main problem is losses in water supply systems which are about 50-90%. The water management measures should be reconstruction, and in some cases, complete replacement of water supply networks that are physically and morally depreciated. In many settlements sewerage system needs to be build or reconstructed and start construction of waste water treatment plants at least for bigger towns.