Anotation:
Fuzzy logical deduction is the method, which uses IF -- THEN rules for a derivation conclusions from observations. The method is suitable for fuzzy control. This paper deals with fuzzy control of a water reservoir with using fuzzy logical deduction. Fuzzy controller LFLC 2000 (Linguistic Fuzzy Logic Controller) is used for stabilization of water outflow from the reservoir during twenty-year flood wave on the given value.