Hidrológiai Közlöny 1974 (54. évfolyam)

3-4. szám - Könyvismertetés

Hidrológiai Közlöny 1974. 3—4. sz. 155 fied, but no more than two involved the analysis of alternatives. The necessity for improvement is clearly demonstrated by this fact. K. Bozóky-Szeszich (Budapest Technical University) Commenting on the paper submitted by Remetey and Lublói it is emphasized that in the analysis of distribution networks mechanical computation methods permit a large number of alternatives to be considered. The problem is due to the large number of alternatives since the designer must make his choice from them. For this reason attempts were made at formulating a programme in which the analysis is performed by starting from correctly assumed values and the evaluation work by the engineer is facilitated. As mentioned in the general report, a number of programmes is available for distribution networks. In the past this was justified to a certain extent, since the users had accessibility to different computers. Unnecessary parallel work should be avoided, but owing to special requirements this cannot be eliminated completely. It is considered important to emphasize that any new programme should be an improvement over the existing ones. It is also believed essential that the specification of the individual programmes sould be compatible up to the level of the data sheets since this would make for applicability with several computers. T Milan Vimazal (SIGMA Enterprise. Czechoslovakia) The SIGMA Enterprise as a trust includes 11 manufacturers of pumping equipment and pipelines. The volume of production grows continuously and the equinment is modernised. Foreign trade transactions are handled by the firm Intersigma. The products are delivered to users in Czechoslovakia and in 17 foreign countries. Activities include also the mounting and pilot operation of pumping stations, waterworks equipment, irrigation equipment and plants. S. Valló (VIZITERV) The current designing problems in water supply, sewerage and wastewater treatment are reviewed in brief. In the future two main considerations must be observed in these fields. One is the necessity of forming large regional systems, the other the need for making allowances in designing work for environmental asoects. The preparation of regional water management nlans has become by now essential, during which both quantitative and quality requirements must be satisfied. F. Fehér (VITUKI) Results of considerable interests have been attained esoecially during the past ten years in hydrology, which are termed collectively as svstems-hvdroiogy in the relevant literature and in the nrofession. Svstems hvdrology is essentially the formulation of a mathematical model to describe and explore the entire hvdrological cvcle. or a nart thereof, or occassionaUy the collection process. The two main srouos involve analytical and synthetic models resnectivelv. both of which are effective tools in engineering designing The systems hydrology models develooed at VTTTTKT fnr nlain-land catchments have been used by VTZTTKRV succesfullv in nreoaring the development plans for a mrticular catchment area. F. Kollár (VIZITERV) The foundations for the development of the integrated water management system in the Tisza-Valley have been laid by the large flood control programs realized at the end of the last century. Agricultural production in the protected area has increasingly called for irrigation already around 1930, this region being the driest in Hungary. Water supply could be realized most effectively by integrated systems including reservoirs. The next stage in the realisation of the Tisza-Valley water management system is the construction of the river barrage at Csongrád. Here a live storage volume of round 300 to 350 million m

3 can be created economically. This can be fitted organically into the integrated supply system, a more distant project of which involves the construction of the Danube

—Tisza Canal. O. Niedling (Hannover, GFR) As a representative of a manufacturer in the GFR, he described three methods of cleaning gas- and water pipelines. Details have been illustrated on slides. The methods can be used without disturbing operation during cleaning. G. Pallós (VIZITERV) In order to obtain a clear picture on corrosion damages and on the situation in corrosion control, a damage survey has been run in 1970 and 1971 jointly by VIZITERV and FTI. In the course thereof it was concluded that there is a shortage of corrosion specialists in the water sector. The theoretical and practical knowledge, as well as the approach to corrosion control problems of the professionals engaged in this domain are inadequate. Measures must be taken in the future to afford the personal, organisational, financial and technical conditions of corrosion control in the water sector. The corrosion control consulting service established for the water sector at VIZITERV performs damage surveys, consultation, regulatory and special designing activities to contribute to the realisation of this programme. Dr. M. Merényi (VIZITERV) Supplementing his paper submitted on the subject of corrosion control for hydraulic steel structures, the solutions adopted for the new steel structures are shown in slides. The examples were related to the Kisköre barrage and the outlet works of the SióCanal. The weight of steel structures in the Kisköre Barrage is round 3 thousand tons, and round 400 tons at the Sió Canal outlet works for which advanced corrosion control solutions have been adopted. O. Haszpra (VITUKI) Slides have been shown to supplement the paper submitted by Dr. Z. Hankó to the conference. In these slides the model tests performed at VITUKI on the problems described in the paper are illustrated. Gy. Váradi (VIZITERV) A few supplementary comments have been presented on his paper on cathodic corrosion control. For steel structures in direct contact with soil or water this method affords unlimited corrosion control. Corrosion in soils and in water is predominantly of electro-chemical character. The corrosive process can be impeded completely by providing negative polarity relative to the environment of the metal. The first costs of cathodic protection are estimated to range from 0.5 to 5% of the total costs of the structure protected. O. Röser (VIZITERV) The operation of pumping stations will not be truly automatic as required by the users, unless the filling of the network after standstills, but also shut-down at a definite instant is performed without any manual control. In the integrated stations currently designed at VIZITERV. this problem has been solved by the controlled, automatic opening and closure of the main pipeline.