PERFECTION OF OPERATION CONTROL FOR THE EMERGENCY RESERVOIRS IN THE KÖRÖS VALLEY

Abstract

The state of art in this field is reviewed. Starting from a synthesis of the positive experiences gained in the operation of emergency reservoir specific proposals are submitted for improving particular steps in operation control and for possibilities of further perfection. The flood situations warranting emergency storage and the `conventional´ approach to reservoir dimensioning are described, pointing out the difficulties in determining the `optimal´ time of impoundment; the drawdown created by emergency storage in the river system is analysed (Figs. 1 and 2) and indices showing the effectiveness of impoundment are derived (Table 1). The key hydrologic-hydraulic parameters reflecting the effects of emergency storage events since 1966 in Hungary are summarised in Table 2. A simplified, approximate method is presented to estimate the drawdown curve from the maximum drawdown. The influence ranges estimated for the inundation of particular reservoirs are shown in Fig. 4. The approach by which the impact study on the parameters of typical flood waves can be simplified and thus made accessible to calculation is presented (sensitivity analysis). The results obtained for this complex phenomenon are compiled in a readily understandable form to support decision making in actual operation control situations. Summarising the ramified studies, the improvements recommended and the perfection options proposed, a refined version of the conceptual model of perfected operation control of emergency flood reservoirs is presented in Fig. 6.