Vízügyi Közlemények, 1948 (30. évfolyam)

2. szám - VII. Szakirodalom

2. Absolute Storage Economics. Actual economics of storage can be stated only through estimations based on detailed planning. Economics can be expressed by the unit cost of utilized water quantity (k) alone and not by that of reservoir capacity. Consequently the aforementioned items lead to relative and approximate calculations only. Absolute storage economics is given by the к unit cost expressed by Formula (120) where К means construction costs, I means amortization percentage for n years, p means rate of interest, с means annual percentage cost of maintenance and operation and finally q stands for utilized mean discharge, which, owing to losses caused by the distance between the site of the reservoir and that of utilization, is less than the Д mean consumption from the reservoir. Amortization is generally computed in three different ways: 1. Straight-line amortization (see Formula 122), 2. amortization of increasing tendency (see Formulae 124 and 125) and 3. amortization of decreasing tendency (see Formulae 126, 127 and 128). In Formula 128 a means annuity percentage. For a reservoir providing an A consumer with a q

l mean discharge and а В consumer with a q

2 mean discharge where A can afford a k

1 and В a k

2 unit cost, the criterion of economics is given in Formula (129). With an arbitrary n number of consumers, for the criterion of storage economics see Formula (130). IX. CONCLUSION. The utmost aim in the hydrological part of the study it is to compute the S = Ф () storage characteristic or rather to disclose the hydrological elements required for its drawing up with a satisfactory precision. To solve this problem, the author has conducted investigations into the laws of mean precipitation in the Carpathian Basin, into the run-off coefficients and is making the suggestion to introduce the characteristic mass curve and the storage characteristic, giving an additional idea of how to compute the ideal mean discharge. The theoretical solution of the problem requires the introduction of coefficient rp for computation of which a likewise theoretical method is to be found in the study. Undoubtedly, in order to get useful results for hydro-engineering practice, it has been necessary to use highly simplified hypotheses in the investigation, nevertheless the following three aspects are proving the applicability of the proposed method: 1. There is no theoretical method taking more thoroughly into consideration the various hydrological elements (topography, vegetation, geological and meteorological conditions) and their complicated combinations. 2. The hitherto measurements and investigations are giving satisfactory proof of the relations contained in the study. 3. Owing to deficiancies in hydrological and meteorological data, it happens in several cases that designers have nothing to rely upon but the proposed method. It is pointed out by the author that the method of exhausting the reservoir, i. e. the way of consumption has been the backbone of his discussion as far as the methodical point of view is concerned. * * * In conclusion the author expresses his hope that his study, too, may contribute to fostering scientific and technical cooperation of the interdependent peoples in the Carpathian Basin and thereby, last but not least, the way for mutual understanding would be paved. * * * The study is concluded by a list of books consulted. (Manuscript closed: Dezember 20, 1944.)