TUFLOW 2D Hydraulic Structures: Difference between revisions
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* If it is not clear or unknown whether the FLC source value is based on the approach or structure velocity, the recommendation would be to apply the blockage in the interests of being slightly conservative on the upstream flood level calculation.
* For most minor obstructions such as bridge piers, the blockage is usually relatively small and whether included or not has a negligible or minor affect on flood levels compared with other factors such as the approach embankments and the bridge deck.
* Blockage from debris wrapped around piers can have a greater influence on the results than the effect of applying or not applying a blockage. Debris wrapped around piers can be accounted for in the FLC value calculated for the pier layer.
* As always, sensitivity testing with and without blockage and +/- the FLC value is highly recommended to understand their importance in regard to the broader modelling objectives and the effects of uncertainties in the input data, boundaries, other parameters such as Manning’s n values, and the accuracy of the numerical solution scheme (see <u>[https://www.tuflow.com/library/webinars/#maximise_accuracy Maximising the Accuracy of Hydraulic Models webinar]</u>).
[[File: Vena_contracta.png]]<br>
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