The water temperature T is used together with the grain size d for the determination of the settling velocity of suspended sediment ws.
The water temperature must be specified if one of the following three transport formulations has been selected when calculating sediment transport rates of non-cohesive sediment in steady flow (pure current) conditions: (i)Ackers & White Transport Formulation, (ii)Engelund & Fredsøe Transport Theory, (iii)Zyserman & Fredsøe Transport Formulation. The water temperature must also be specified if Bijker's Transport Method is used to calculate sediment transport in current and waves.
The water temperature may be used as a calibration factor in MIKE 21 ST for those formulations calculating suspended load transport separately. Higher temperature yields higher settling velocity for the suspended sediment, and consequently smaller amounts of sediment in suspension and lower rates of suspended load transport than otherwise.