Abstract
The variation of the Manning roughness with flow depth in two hardwood-dominated vegetation halos that surround water-delivery structures in Everglades National Park was investigated. The results show that the hydraulic resistance of the halos decreases approximately linearly with increasing flow depth. For flow depths less than 15–20 cm, the hydraulic resistance is similarly high in both the halo and the downstream marsh vegetation, however, as the flow depth increases the hydraulic resistance in the halo decreases to below that in the downstream marsh. As a consequence, for increased stages at the delivery structure, the halo vegetation will become less restrictive relative to the marsh vegetation in controlling water deliveries.
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