Vízügyi Közlemények, 1971 (53. évfolyam)

4. füzet - Rövidebb közlemények és beszámolók

(13) gaging cross-sections arc illustrated in Tabic 1, and concentrations downstream of the Tiszalök Barrage completed earlier (and into the tailwater of which the backwater created by Tisza II Barrage will reach) are shown in Fig. 1. The consequent channel changes are as tabulated in Table II. Changes in the backwater reach of the new barrage and over the reach downstream therefrom are shown in Tables 111 and IV, respectively. The pereent-byweight profile of wash load scoured under average flow conditions is illustrated in Fig. 5. It is concluded that sediment will be deposited in the reservoir at the rate of about 1.3 million cu.in/^ear and scouring over the downstream reach will be lOto 12 cm annually. 5. Auer, R. and Berhidai, G., Civ. Fngrs.: The combined vvatersupply system of the villages Aggtelek and Jós va fő. (For the Hungarian text see pp. 82) The two villages are situated in the Northeast Hungarian karstic region, in the surroundings of the famous stalactite cave Aggtelek (Fig. I). The total demand is estimated at 474 cu.m/day, allowing also for the increment during the tourist season. Under the particular hydrogeological conditions a supply system based on springs was warranted. Characteristic data on the springs have been compiled in Table I. In accordance with this plan the pipeline has been constructed to the profile shown in Fig. 2. The novel design of a 100 cu.m capacity surge tank may be of interest (Fig. 4). The midget waterworks operates since 19(58. 5. Fekete, J., Civ. Engr.: The application of prestressed concrete in hydraulic engineering practice. (For the Hungarian text see pp. 91) Quoting examples from French practice the application of prestressed concrete design to hydraulic structures is considered. In Section 1 the potential applications, in Section 2 a historical review and in Section 3 the problems related to corrosion control in prestressed hydraulic structures are presented. Potential fields of application include: 1. the enlargement or raising of existing structures, 2. improving the stability of existing structures and 3. the economic design in prestressed, or anchored concrete of new structures. "in connection with the historical review examples are quoted indicating the future trend towards prestressing in I he case of weirs, hydroelectric stations, lock chambers and other large structures. Figs. 2 to 11 present pictures on the construction of the Argentat Dam. the Cheurfas Dam, the St. Michael Dam at Braspars, the Iron Gate Dam in Algier, the Chastang Dam, the Beni-Bahdel Dam in Algier, the Maréges Dam in India and the Mallemort hydroelectrics station. Concerning corrosion control in prestressed hydraulic structures, the application of polyesther resin and cement mortar coating are described more in detail.