RedactedNarrative: V1 was traveling Northbound on the Intra Coastal Waterway at approximately slow speed.  V1 was approaching the dock at approximately a 45 degree angle  in preparation of docking the vessel.  V1 hit a piling with the front starboard side of his vessel. V1 then hit a second piling with the bow of his vessel. The second piling broke in half striking a woman in the arm., the woman was sitting at a table on the dock directly in front of the broken piling when struck.  Operator was arrested for BUI, he refused to give a sample.victim suffered a contusion to her right upper arm from being struck with the dock piling and a soar right wrist.  She was released from the hospital later that afternoon.