The purpose of the present study is multi-folds. Mainly tospecify design criteria for designing the optimum length of theroughened floor for silled heading up hydraulic structures asregulators. To achieve the purposes of the current work,experimental investigations are conducted. Also, a theoreticalstudy is carried out for the purpose of determining the(3) Development of fuzzy logic control system methodology using expert rules obtainedthrough energy reducing considerations. In addition. dual mode control is a ”spin-off”design method which. although no longer time optimal. can be viewed as a near-optimalcontrol method which may be easier to implement In both types of design optimizationof the fuzzy logic controller can be used to improve perfonnance.