The measured distances between cross sections are referred to as reach lengths. The reach lengths for the left overbank, right overbank and channel are specified on the cross section data editor. Channel reach lengths are typically measured along the thalweg. Overbank reach lengths should be measured along the anticipated path of the center of mass of the overbank flow. Often, these three lengths will be of similar value. There are, however, conditions where they will differ significantly, such as at river bends, or where the channel meanders and the overbanks are straight. Where the distances between cross sections for channel and overbanks are different, a discharge weighted reach length is determined based on the discharges in the main channel and left and right overbank segments of the reach (see (.Equations for Basic Profile Calculations v6.7_Beta:3), of "Theoretical Basis for One-Dimensional and Two-Dimensional Hydrodynamic Calculations").