Hidrológiai Közlöny 1938 (18. évfolyam)

Vitális Sándor dr.: Salgótarján megyei város vízellátása

480 Dr. Sándor Vitális of the rivulet Tarján or its side beds. Calculating roundly by an annual water demand of 550.000 cu. m. and adding 30% to cover evaporation, leakage and other losses, we obtain a gross annual water demand of 715.000 cu. m. The storing basin should contain at least the water amount covering six months want, i. e. 357.000 cu. m. The investigation of the precipitation fallen in Salgótarján during the last 11 years shows that the annual rainfall from 1929 to 1937 averaged 605 millimeters. The minimal annual precipitate was observed in 1932, equalling 439.6 millimeters. Calculating with these values we can take as granted that each sq. km. surface can store maximally 146.000 cu. m. water in each year. Thus we need in our case a water basin of 4.89 sq. km. surface to be able to store the water amount wanted. The valley dam located between Salgótarján and Somoskőújfalu on the left bank of the rivulet Taiján at Kis Gedőc Puszta in the trench Tatár could store water of a water basin of about 4.5 sq. km. This kind of solution has, however, the drawbacks: high investition costs, high prices of territories to be purchased and the continual costs of water purification, filtering, etc. 2. Water of rivulets, rivers. The rivulet Tarján flows through the city Salgótarján and has its mouth into river Zagyva southwards of Salgótarján, at the village Kisterenye. The water of both the rivulet Tarján and the river Zagyva is defiled, their water amount if low and has great variations. These explain why they cannot be taken in count for covering the water supply of the city. 3. Natural springs. The springs located in the valley of the rivulet at Salgó can be considered at the partial water supply of the city amongst the springs known in the environment of Salgótarján. The spring Pólyán (3.7 km far of the city) originates from an opening of the glauconitic sandstone. Its water yield is 80—130 liter in each minute and could be increased by adapted setting. The so-called Fűzfa spring in the neighbourhood of the Potyán spring and the springs located below Krecs Puszta could be inserted within the water supply by adapted setting. The total water yield of the spring Pólyán and all of its neighboring springs can be estimated to 300—350 liter in each minute. This kind of water supply (exclusively for potable water) would be a partial and inexpensive practical way for the solution of the problem. II. Underground, deep lying waters. Primarily the deeper lying water storages must be kept in mind at the solution of the problem of water supply, owing to the insufficiency of the amount of external (surface) water.