Really, I'd think a deck was a good thing. It takes all that water running off the roof and allows it to be dispersed slowly over a greater area of land. Nobody builds "impervious" decks.
I assume there is a lot of wiggle room for contractors who know what they're doing. I'm seeing breakwater extensions, wooden walkways/docks horizontal to the shoreline, good sized decks in the 50 foot buffer. All being done by big name local area contractors.
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