Figure 5.5.42 – Providing dry passages enables terrestrial animals to use culverts when the base of the structure is flooded. A: Culverts in Mediterranean areas may remain dry or with low water level for much of the year, but require large dimensions for drainage during periods of heavy rain. These structures are particularly suitable for adaptation to wildlife by providing dry ledges, appropriate landscaping at the entrances and guiding fencing; B: Adapted culvert with two ledges to keep dry areas for fauna passage. The lower is part of the original concrete structure and the higher is a wooden ledge installed later to facilitate animal crossing when lower part is flooded (Photos by: Minuartia).