Zep, for me I had to take out some stone rip rap but my bank gos from 4/12 to 10/12 after the first 6 feet. See picture.
I think if you have a long long slow slope you may have to dig a trench in there some how.
When my gang way is on the mud the barrel on the end of the gang way is in the mud bottom too. The dock then hinges down. This is if we have over 40"s of water loss. This is the case for about 2 weeks in the summer.
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