A weir coefficient of 0.5 was found to induce more model instability as compared to a coefficient of 2.0. Weir coefficients sensitivity was tested between 0.5 and 5.0. The weir stability factor is often set to 2 or 3 for coupled 1D/2D models to address stability issues with 1D/2D flow transfer. A weir coefficient of 2 is recommended to limit the head loss across the weir along with setting the weir stability factor to 3. A Lateral Structure placed on the main reach will serve to convey flow to/from the tributary and main reach.
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