Draw the open-loop block diagram for this system and specify the input (manipulated variable, F(t), and the disturbance, F i (t)) and the output variable (controlled variable, l(t)) for this system. How many parameters do you need to specify to solve the problem numerically? Choose a control equation to reduce the degrees of freedom of the system to zero) Choose different values for C v , cross-sectional area of the tank, the initial level of water in the tank, and the steady-state value of the valve's opening (usually taken as 0.5x ) and study their effect by looking at the closed loop response