Vízügyi Közlemények, 1937 (19. évfolyam)

3-4. szám - Szakirodalom

20 given circumstances, with what density of population it is economical to establish a central waterwork, and in what cases it is more advantageous to persist in maintaining the water supply by separate wells. As the greater part of the construction costs of a sewerage system is also made up of the costs of pipes, a similar simple method might be worked out to determine the costs of a sewerage system. In Hungary many problems are still to be solved in connection with the supply of drinking water. The writer thinks it desirable to concentrate in the hands of one authority all the affairs of the water supply, which at present come into the spheres of activity of different ministries and authorities. If this solution is not feasible under present conditions, an organ should be established for the purpose of creating cooperation between the different authorities. In general the water supply is a local problem, and every commune has to solve it for itself. But even in those countries where the water supply is highly developed, associations have been formed or offices founded for the purpose of collecting and working up data of experience and determining the principles of further development. V. REGULATION OF THE KOPPÄNY BROOK ; ECONOMIC CONSEQUENCES. By J. M ANT I'ANO. (Pages : 91—106.) In 1930—33 the Koppány brook (Tolna county) was regulated at the request of the interested parties for a length of 33 kms. The brook has a catchment area of 745 sq kilometres. Its water volume is extremely variable ; the maximum discharge amounted to 22-2 cu metres per second, and as a minimum discharge 82 litres per second was measured on 26th July 1935. The sum of earthwork was 312,800 cu metres, and the costs of regulation amounted to 179,700 pengő. The total area interested was 1230 hectares. Of the regulation costs 146 pengő fell to one hectare, of which average the State took upon itself 68 pengő and granted 75,000 pengő as a government loan on a 17 years amortisation plan. As a result of the regulation, 1230 hectares were reclaimed. Data of the rise in value and revenue from the protected area, as well as of the quantity of products and their value, have been secured from the municipalities and the stewards of domains. According to these data, the value of the protected lands increased by 438,000 pengő, of which 358 pengő fell to one hectare on an average. Strictly speaking, the change in value varied between a rise of 640 pengő and a depreciation of 145 pengő per hectare. If we calculate the rise in value from the surplus of production, by taking into account the fact that before the regulation of the brook 15-0 quintals of hay