Vízügyi Közlemények, 1998 (80. évfolyam)

3. füzet - Simon M.-Békési I.: Tisza-Körös völgyi együttműködő vízgazdálkodási rendszer vízkorlátozási terve

Tisza-Körös völgyi együttműködő vízgazdálkodási rendszer vízkorlátozási terve 489 IRODALOM OVH (Országos Vízügyi Hivatal): Országos vízgazdálkodási keretterv. OVH. Budapest. 1984. Pálfai /.. Az 1983. évi aszály Magyarországon. Vízügyi Közlemények. LXVII. évfolyam 1. füzet. 1985. Pálfai I.: Az 1992. évi aszály Magyarországon. Vízügyi Közlemények. LXXV. évfolyam 3. füzet. 1993. Váradi J. Gy.: Vízgazdálkodás az Alföldön. Vízügyi Közlemények. LXXV. évfolyam 3. füzet. 1993. * * * Plan for limiting water demand in the cooperating water management systems of the Tisza and Körös river valleys by Mihály SIMON and István BEKES civil engineers The drought ridden years of the eighties, and especially the year 1990, have demonstrated in an "illustrative" way that natural water resources cannot meet water demands in the critical months. Thus there was substantial water shortage in the Tisza and, even higher, in the Körös river valleys. Tolerable conditions can only be secured by storage and water diversion from the Tisza. Water diversion is facilitated by the Tiszalök and Kisköre river dams (Figure /.). The river barrages allow gravitational water conveyance from the Tisza through irrigation main canals Keleti, Nyugati and Nagykúnsági. Nevertheless, these irrigation main canals are serving mostly their own target areas and the supplementary supply of water into the Körös river valley can be secured by the close cooperation of the water management systems of the two river valleys. In 1994 a plan was prepared for exploring the options of limiting the water demands of the Tisza river section between Tokaj and Csongrád, the Körös River Valley and of the service areas of the irrigation canals Keleti and Nagykúnsági, also determining the extent and consequences of these restrictions. Water diversions aimed at meeting the water demands are shown in Figure I., along with the hydraulic structures which govern the operation. In making the plan the following requirements were considered: — Operation rules of the water distribution structures; — Government resolution No. 2048/1993 (XI. 18) on the "updating of the use of the Kisköre Reservoir (the Lake Tisza), and proposals for further development". On the basis of the said government resolution the following main rules can be identified: — The maximum water level of the Kisköre Reservoir (Lake Tisza) shall be kept at the present level (89.25 m above Adriatic Sea level, m.aAS) and water use options of the next 20 years tailored to this level; — In addition to preserving the basic function of the reservoir in meeting irrigation water demands the priorities should be given to nature conservation and recreational-tourism. The study has analyzed the long term hydrological time series, with special regard to precipitation, air temperature, soil moisture, surface water level and low flow water quality time series of the last decade (1982-1993), exploring the water diversion option in the Tisza and Körös river valleys and the aspects to be taken into account in the determination of the restriction of water demands. Water will be distributed with the help of the hydraulic structures which govern the operation of the canal system. The basic assumption of the analysis was that the demands can be fully satisfied with the help of the distribution system. Thus the assumptions were as follows: — The upstream water level of the Tiszalök river barrage is 94.50 m.aAS — The upstream water level of the Kisköre river barrage is 89.25 m.aAS — The minimum water release from Kisköre reservoir is 80 m

3 s"

1 — Diversion to River Berettyó through the Bakonszegi weir is higher than 8 m

3 s 1 — The flow diverted to the Hortobágy-Berettyó system reaches 16 m

3 s

_

1 and 10 m

3 s~' at Ágota and Türkévé, respectively.