PROBLEM TO BE SOLVED: To provide a stormwater drainage controlling device capable of ensuring sufficient reliability as the whole device even if there is in a state to lose reliability of a model while the model is used to have control over the stormwater drainage, systematically handling a hybrid control system wherein a continuous time phenomenon is intermingled with a discrete time phenomenon and eliminating a control destabilizing factor such as an occurrence of a discontinuous phenomenon or the like.;SOLUTION: When, for example, J1 is selected from among stormwater drainage controlling amount operation sections J1, J2, etc. and JT, a predetermined estimate (for example, stormwater flow) is calculated by the predictive model 13, a predetermined controlling amount (for example, the number of pump operator's seats and the number of revolutions of the pump) is calculated on the basis of the result by a control model 14. When a control selecting section 15 decides that the reliability of the operation section J1 is impaired during the operation, the selection of the operation section J1 can be immediately stopped. Each evaluation function of other operation sections J2, etc. and JT is calculated by the optimal control evaluation means 16, and the smallest value of the evaluation function is selected among of them.;COPYRIGHT: (C)2005,JPO&NCIPI
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