For purposes of subsection (a)(2), a Federal navigation channel or a related structure is an existing channel or structure, respectively, if it was authorized before the date on which the relevant System unit or portion of the System unit was included within the System.
Except as provided in paragraphs (2) and (3) of this subsection, limitations on the use of Federal expenditures or financial assistance within the System under section 3504 of this title shall not apply to expenditures or assistance provided for services or facilities and related infrastructure located outside the boundaries of unit T–11 of the System (as depicted on the maps referred to in section 3503(a) of this title) which relate to an activity within that unit.
No new flood insurance coverage may be provided under the National Flood Insurance Act of 1968 (42 U.S.C. 4001 et seq.) for any new construction or substantial improvements relating to services or facilities and related infrastructure located outside the boundaries of unit T–11 of the System that facilitate an activity within that unit that is not consistent with the purposes of this chapter.
No financial assistance for acquisition, construction, or improvement purposes may be provided under any program administered by the Secretary of Housing and Urban Development for any services or facilities and related infrastructure located outside the boundaries of unit T–11 of the System that facilitate an activity within that unit that is not consistent with the purposes of this chapter.
For purposes of this paragraph, the term “financial assistance” includes any contract, loan, grant, cooperative agreement, or other form of assistance, including the insurance or guarantee of a loan, mortgage, or pool of mortgages.