Comparison with deposition model The data used for input to the deposition model are presented in Table 1 Some assumptions had to be made to derive the data given in Table 1, the more important ones are discussed below. Firstly, the upstream boundary the settling reach was assumed to be unaffected by the swirling flow produced at the bend. However, the swirling flow would lend to keep the sediment in suspension, so the location of the upstream boundary was not taken as the sluice channel entrance