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The dynamic model of a constant pressure water reservoir system is obtained. A design procedure, combining the classical compensating networks and parameter optimization techniques is presented. A performance characteristic constraint on the overshoot and settling time of the reservoir's height is assumed which implies the need of a lead compensator. The lead compensator's pole position is obtained by minimizing an integral square error cost function. The repeated-operation mode of the analog computer is used in an automatic parameter sweep method to find the optimum lead compensating network. The results obtained give the desired variation of the reservoir's height which is proportional to the pressure.