Vízügyi Közlemények, 1948 (30. évfolyam)
2. szám - VII. Szakirodalom
(10) Periodical consumption is generally necessitated by navigation and irrigation, nevertheless it may emerge in line with hydro-energy generation as well, e. g. when, for approximate equalization of energy production of a non-storage hvdro-electric plant, periodical emission of water from a separate reservoir is wanted, as shown in Figure 66. VI. OUTPUT OF RESERVOIR OF DEFINITE CAPACITY. The second and probably more common case in design is reached when hydrological output, i. e. the available mean consumption must be computed for a given realizable maximum capacity limited by conditions both topographical and geological. Howerer, without taking the character of consumption for known, the problem cannot be regarded as definite. It is expedient to apply a reverse solution. For the consumption of known character we compute, according to Chapter IVId, the storage characteristic from which belonging to any arbitrary S value can be read. It can mostly be preestimated whether realizable capacity corresponds to: pondage, seasonal storage or multi-annual storage and so it is only the respective section of the curve that must be plotted or computed. Storage is limited mostly (at least in the Carpathian Basin) by no hydrological, but by geological and topographical conditions. It is obvious that usually there is an S G value below the SQ hydrological limit and so q g belonging to S g means the upper limit for the output of the reservoir with the given character of consumption (See Figure 67). In concluding Chapter VI the author explains the problem involved by hydrological design of the Visó-Valley reservoir. According to rough preliminary investigations, geological and topographical conditions in this region are offering the possibility of establishing a reservoir with a capacity of about 900 million m 3. For this capacity, based on assumptions discussed at large in this study, the author has computed the output of the reservoir, i. e. those water quantities which would be available for various purposes. VII. HYDRO-ECONOMICAL PLAN. The hydro-economical plan of the reservoir is the final stage in hydrological design. It explains the operation of the reservoir and the temporal distribution of water quantities available for multiple-purposes. The hydro-economical plan may be prepared numerically as schemed in Table XIII, however, it is more expedient to apply the graphical method even if the previous stages of design had been prepared through computation. The graphically prepared hydro-economical plans are clear and perspicuous. The hydro-economical plan for the designed Visó-Valley storage, with regard to the conditions discussed in Chapter VI, is explained in Figure 68. VIII. STORAGE ECONOMICS. 1. Typical Factors Of Relative Storage Economics. As it is usually the cost of the dam that makes the majority of expenditures for the whole project, in scientific literature, for characterizing relative storage economics, it has become customary to give: (103) ß = — W which is the useful capacity for the unit of dam volume. Figure 69 shows, for a dam site, the ß values adherent to dams of different height. Through the ß curve approximate computation of the most favourable height of dam is made possible (ти).
