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Floodplain planning and building materials

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I am looking for materials that are durable enough to use to construct bridges, trails, and boardwalks in a fairly active river floodplain. I am also looking for information and manufacturers on an 'incline tramway' as a way to get handicapped people down the river bluff to the trails in the floodplain. The bluff is at a slope greater the 45 degrees, and I feel that is the only way to get those folks down there without seriously impacting the natural areas and exacerbating the erosion problems on the bluff.
 

bl

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rubble, silt, mowed stoloniferous grasses, and herbicide routine???

I've seen seasonal bottom crossings made of deep concrete become partially silted over.
 
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What about handicapped accessibility? This is one of the goals of this project. If concrete was used, do you think that it would need constant maintenance after flooding?
 
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