The present disclosure provides methods for controlling volumetric flows of streams into a combustor (10a), and particularly in a combustor utilized in a power production method. A controller (210) can be used to receive a variety of inputs, carry out calculations, and output one or more signals that adjust one or more parameters of one or more of the streams entering the combustor. Such adjustments can be effective to normalize a volumetric flow rate (10a) between the combustor (10a) and a turbine (10b)immediately downstream from the combustor without requiring direct measurement of the volumetric flow rate between the combustor and the turbine immediately downstream from the combustor.