using "types"; VolumeFlowRate as flow_vol (Brief="Volumetric Flow Rate", DisplayUnit='m^3/d', Lower = 0); MassConcentration as conc_mass (Brief="Mass Concentration", DisplayUnit='g/l', Lower=-1.0, Upper = 1e10); Alkalinity as Real (Brief="Alkalinity", final Unit='mol/l', Lower=0.0); SedimentationVelocity as Real (Brief="Sedimentation Velocity", final Unit='m/d'); SedimentationFlux as Real (Brief="Sedimentation Flux", final Unit= 'g/(m^2*d)'); SludgeVolumeIndex as Real (Brief="Sludge Volume Index", final Unit= 'ml/g'); decayRate as Real (Brief="growth and Decay Rate", final Unit= '1/d'); ReacRate as Real (Brief="Reaction Rate", final Unit= 'kg/m^3/s'); GeneralFactor as Real (Brief="General Factor",final Unit='g/(m^3*m)');