The one-dimensional approach is reasonable for a prismatic channel in a relatively narrow floodplain but may not be appropriate for sinuous rivers with several tributaries in broad floodplains. Uncertainty in the flood-inundation polygons increases with distance from the main channel for which water-surface slopes are simulated. Two-dimensional models are increasingly used for simulating floodplain inundation because of the variability in topography across the floodplain, particularly in wide floodplains with numerous tributaries.
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