CASE STUDY OF COMPREHENSIVE MANAGEMENT OF WATERRESOURCES IN DROUGHT PERIODS IN TONE. YODO & YAHAGI RIVER BASINS

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This research reveals facts and logics of water shortage in a large-size basins as follows;(1) Too much optimistic water management in early autumn after typhoon season on the basis of future runoff expected in normal year caused water shortage of carry-over stored storage in reservoirs. In the Yodo river basin this type of shortage typically occurred in some drought years.(2) Too much optimistic expectation of runoff caused by melted snow in a basin on flow discharge basis caused shortage of water storage in reservoirs in all basins due to over generation of hydroelectric power.(3) Unexpected and precisely unpredictable runoff in the other catchment areas resulted in "over-spill" flow discharge at river mouth(s). A regulating reservoir can be only one measure to save this kind of spill.(4) Such regulation in basin-wide water management as decrease in diversion requirement of river water resulted in "protective" over-diversion by every association and sequentialy in eralier defecit of storage in reservoirs.(5) "Release for flood control systems" of reservoir capacity management can not be applicable in these basin.