Vízügyi Közlemények, 1973 (55. évfolyam)

4. füzet - Rövidebb közlemények és beszámolók

The intake to the Jászság main canal is situated on the right-hand bank of the Tisza River, also immediately upstream of the barrage. With a conveying capacity of 48 cu.m/sec it delivers, partly by gravity, irrigation water to the 72,000 hectares of irrigated land in the Jászság project. Higher areas are supplyed by pumping. Both main canals are elevated above the surrounding terrain (the raised waterlevel in them is higher than the average terrain), with cut-and-fill section and have a flat slope of 2 cm/km (Fig. 2.1—11). Over most of their length the main canals are excavated in cohesive soils, the seepage waters being collected and removed to the drainage canal system accomplished by means of parallel canals. The main canals themselves contribute to the drainage of excess surface runoff. Crossings of the main canals with drainage canals or railways are solved by inverted siphons, while roads are taken over the canals either by surface-regulating sluices, or by bridges. The total length of the main canals is 190 km, over which the number of major structures, including lifting station is round 100. No navigation has been contemplated on the main canals. Operation in them is controlled by tailwater-controlled automatic gates. The main intake gates are operated electrically, while the other surface regulators hydraulically. CONSTRUCTION OF THE BARRAGE 2.1 Dóra, T., Hankó, Z., Jurcsek, V.: Design and research work associated with the Kisköre Barrage and irrigation project (For the Hungarian text, see pp. 63) The Institute for Hydraulic Planning (Budapest) was responsible for 50« о of the preliminary planning and experiments and for 90% of the designing work for the complex project serving multi-purpose water management. A permanent supervision and surveying team of the designer was stationed at the construction site of the barrage. Detailed designing was preceded by preliminary studies, which had demonstrated postively that the optimum solution for providing the irrigation water needed for increased agricultural production was a barrage and a reservoir upstream thereof created by channel storage and impoundment of the flood plain. Particular technical solutions were founded on preliminary studies and experiments, including the application of tubular turbines, the use of radial gates topped by tilting leaves as the principal organs of closure, the adoption of electro-hydraulic hoists for the gates and narrow piers. In the course of preliminary hydrological studies the stage and discharge data for the barrage site were processed from 1901 to 1960. The typical discharge and stage data are as follows: lowest flow on record 56 cu.m/sec 79.94 m A.O.D. mean flow 510 cu.m/sec 83.90 m A.O.D. maximum flood on record (of 2.2% probability) 3620 cu.m/sec 90.78 m A.O.D. 18 273