In order to close the system of equations describing the sediment transport, bed change, and bed sorting equations, the fractional depth-averaged total-load concentration potential (Ctk*) must be estimated from an empirical formula. The depth-averaged concentration potential is defined as

1) C_{tk}^{*}=\frac{q_{tk}^{*}}{Uh}

where qtk* is the total-load transport potential for the kth sediment size class.

HEC-RAS 2D Sediment supports the following Transport Potential Formulas: