Section 178.410 - Drainage of flush deck vessels(a) Except as provided in paragraph (b) of this section, the weather deck on a flush deck vessel must be watertight and have no obstruction to overboard drainage.(b) Each flush deck vessel may have solid bulwarks in the forward one-third length of the vessel if: (1) The bulwarks do not form a well enclosed on all sides; and(2) The foredeck of the vessel has sufficient sheer to ensure drainage aft.CGD 85-080, 61 FR 966, Jan. 10, 1996, as amended at 62 FR 51357, Sept. 30, 1997