function y = belt_conv_flow(x)
Vr = x(1); % Flow Rate at Drainage of SILO 1 [mm3/sec]
Flow = x(2); % Total Flow Rate through SILO 1 [mm3/sec]
LEVEL = x(3); % LEVEL at SILO 1 [mm3/sec]
if LEVEL == 0
    y = Flow;
else
    y = Vr;
end