According to Lacey, a channel is said to be in regime, if

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Lacey's theory of regime relates to the stable condition of an alluvial channel, where the channel dimensions and slope adjust to the sediment load and water discharge such that the channel is neither aggrading (depositing sediment) nor degrading (eroding its bed and banks). This stable state implies that the channel's flow, sediment characteristics (silt grade and silt charge), and the material of the channel bed and banks (incoherent unlimited alluvium of the same character as the transported material) are consistent, leading to the conclusion that all the given options (A, B, and C) are correct indicators of a channel being in regime.

According to Lacey, a Channel Is Said to Be in Regime