Vízügyi Közlemények, 1973 (55. évfolyam)

4. füzet - Rövidebb közlemények és beszámolók

(11) the computation can be performed within a very short time even with manual computation methods. It is emphasised finally that the method cannot be applied unless the steady levels are constant. For this reason it is impossible to use unless this condition is not satisfied. CONSIDERATIONS ON THE LONG-RANGE PLANNING OF REGIONAL WATER SUPPLY SYSTEMS By József Varga, Ph. D. (For the Hungarian text see pp. 63) The capital equipment needed in the sector of water management is considerable. The fixed assets have a very long service life. The elaboration of long range sectorial plans justified by these two factors. One domain of planning comprises the development of complex, regional water supply systems. A methodological procedure is described lor the preparation of such 50-year long development plans in which the simultaneous planning of communal, industrial and agricultural supply systems is considered. Allowance is made for the supply systems is considered. Allowance is made for the supply conditions and for the variations in demand. The trunk mains are located rationally on the terrain and the cheapest technically feasible alternative is adopted. Economic reserves are formed, the capacity of the economy is taken into consideration, moreover the demands for water of the economy and the society are met to the highest degree under the particular conditions. The planning time range is resolved into 10 — 15 — 20 years long periods and a mathematical model is developed lor solving the planning problem. A number of publications are known which deal with the planning of individual elements of the water supply system. To mention a few, Л. Filipkowsky

: Current problems of the water management balance in Poland. Vízügyi Közlemények, l'JG7, No. 3. ÍV. Günther: Die Planung eines Systems von Kläranlagen in einem Flussgebiet mit Hilfe der linearen Optimierung. Die Wasserwirtschaft, VJG8, No. 7. H. Bauchwitz : Zur Anweridbaikeit der Methode der Dynamischen Optimierung in der Wasserversorgung. Die Wasserwirtschaft, 1LC8. No. 7. J. Varga: A stochastic investment problem. Decision Mcdels, 11. K. J. K., 1969, etc. The subject of the present paper is manifold more complex. The starting consideration is that the development of econcmy ar.d society is of controlling importance in the growth of overall and local water demands. The estimation of demands is founded accordingly in the following assumptions: I. In Hungarv all homes are expected to be served bv communal watersupply by about 2020. 2. The population living within a given region produces a rational inccnie correspondig to the national average, continually in the area of the region. 3. The national income is expected to increase at an average rate of about 5%. Further assumptions are concerned with the growth of population, its geographical distribution, the development of agricultural production, the m n ber of population that can be supported by agriculture, the variations in standards of application and their similarity to international standards, etc. The concept of the „development section" is introduced and assigned as the carrier of water demands. The demands, in turn, are estimated with the following formulae : a

) Communal demands К = L yVo, where L is the number of population in the development section, у is the consumption modulus characteristics of the magnitude of the section, V' is the national