Vízügyi Közlemények, 1989 (71. évfolyam)
2. füzet - Varga István: Vízrendezési főművek fejlesztésének gazdasági értékelése
Vízrendezési főművek fejlesztésének gazdasági értékelése 293 После рассмотрения необходимых условий и взаимосвязей автором приведено два применения предложенной методики на экономическом сравнении двух вариантов развития (табл. I и рис. 5) и на оценке оптимального размера развития одного из вариантов (рис. 6). * * * Economic evaluation of the development of main structures used in drainage by Dr. I. VARGA, С. E., candidate of technical science The possible ways of relative or absolute evaluation of alternatives in the development of main structures used in flat catchments is discussed by the author. His objective was the presentation of a simple method by which the ranking of the different alternatives set up for the development of main drainage structures can be performed, and the near-optimal level can be estimated for the same reason. The recommended method - based on up-to-date criteria in investment - was built on a procedure by which the costs and the expected benefit obtained in the year of decision can be compared. Costs are scheduled in accordance with an assumed gradual-proportional use of the available funds; operation (maintenance, care-taking, etc.) is in harmony with usual annual increments due to our present economic realities. By estimating the results if main structure development is carried out, it was assumed that - the development is primarily for capacity increase, - results will appear definitely in agriculture, - agricultural results are proportional to the total golden-crown (a former currency in Hungary) value of the affected land and to the average annual reduction in inundation due to the capacity increase in question (Fig. 1 ). To determine runoff volumes in different seasons the author applied Pálfai's (1988, 1989) results and relationships (1) to (7) introduced by the same researcher in the probability range of 0<s<0.5. In estimating the results the level of agricultural production and increasing crop prices were taken into account. The needed and expected future development of farms and farming associations with their assumed time of realization were also considered. As economic indicators, the specific total (direct and indirect) harms (harm values) were suggested (16 relationships) by which the benefits of the investment will cover the costs with due regard on the normative efficiency (discount-rate) considered as indispensable on the level of the national cconomy. Accordingly, the alternative with the lowest indicator is considered as most economic. Based on similar assumptions, the near optimum for specific capacity in case of a given development can be calculated. After presenting the necessary conditions and the recommended method, an economic comparison (Fig. 5) of two main structure-alternatives (Table I) was performed along with an estimate of optimum capacity (Fig. 6) for one of the developments.
