(a) The tabular freeboard for a Type ``B'' vessel of between 79 feet and 328 feet in length having enclosed superstructures with an effective length of up to 35 percent of the length of the vessel shall be increased by: 0.09 (328-L) [0.35-(E/L)] inches where: L = length of vessel in feet.E = effective length of superstructure in feet as defined in Sec.
42.20-50. [CGFR 68-60, 33 FR 10064, July 12, 1968]