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"Bridges: Allow for some freeboard, typically at least 0.5 to 1.0 meter, between the bottom of bridge girders and expected high water level and floating debris. Structures in a jungle environment with very high intensity rainfall may need additional freeboard. Alternatively, a bridge may be designed for overtopping, somewhat like a low water ford, and eliminate the need for freeboard, but increase the need for a erosion resistant deck and approach slabs (Photo 10.6)." [See Photo 10.6, page 102.] |
