such vessels at the volume of the largest remaining penetration in order to supplement either an operable Higgins pump or a dewatering pump of equivalent or greater capacity. (E) Install in such vessels not fewer than four independently powered bilge alarms. (F) Inspect any such vessel in water after each time a through-hull penetration of such vessel has been removed or uncovered. (G) Verify the watertight integrity of any such vessel in the water at the outset of each waterborne departure of such vessel. (3) Prohibition on operation of noncompliant vessels The following amphibious passenger vessels may not operate on United States waterways: (A) Commencing as of the date the regulations required by paragraph (1) are prescribed, any amphibious passenger vessel whose configuration or operation does not comply with the requirements in paragraph (2). (B) Commencing as of the date specified by the Commandant of the Coast Guard pursuant to subsection (d), any amphibious passenger vessel whose configuration or operation does not comply with the requirements in the regulations under paragraph (1). (b) Severe weather emergency preparedness Not later than 180 days after the date of the enactment of this Act, the Commandant of the Coast Guard shall prescribe in regulations— (1) the limiting environmental conditions, such as weather, in which amphibious passenger vessels may safely operate, and a requirement that such limiting conditions be described in the certificate of inspection of each amphibious passenger vessel