# TUFLOW Message 1298

From Tuflow

**TUFLOW Message**

WARNING 1298 - 1D timestep must be less than or equal to smallest timestep from the 2D domains

**Alternate Message**

NA

**Message Type**

WARNING

**Description**

1D timestep must be must be less than or equal to the timestep of the 2D model. If multiple 2D domains are used the 1D timestep must be less than or equal to the smallest timestep in any of the 2D domains. If using a 1D timestep smaller than 2D timestep, the 2D timestep needs to be divisible by the 1D timestep. For example a with a 2D timestep of 4 seconds a 1D timestep of 1 or 2 seconds is ok, but 2.5 not valid.

**Suggestions**

Specify a 1D timestep less than or equal to the 2D timestep or the smallest 2D timestep for a multiple 2D domain model.

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