(i)
Tribal supplemental funding amount.—
Of funds made available for each fiscal year for the tribal transportation program, the Secretary shall set aside the following amount for a tribal supplemental program:
(I)
If the amount made available for the tribal transportation program is less than or equal to $275,000,000, 30 percent of such amount.
(II)
If the amount made available for the tribal transportation program exceeds $275,000,000—
(aa)
$82,500,000; plus
(bb)
12.5 percent of the amount made available for the tribal transportation program in excess of $275,000,000.
(ii)
Tribal supplemental allocation.—
The Secretary shall distribute tribal supplemental funds as follows:
(I)
Distribution among regions.—
Of the amounts set aside under clause (i), the Secretary shall distribute to each region of the Bureau of Indian Affairs a share of tribal supplemental funds in proportion to the regional total of tribal shares based on the cumulative tribal shares of all Indian tribes within such region under subparagraph (B).
(II)
Distribution within a region.—
Of the amount that a region receives under subclause (I), the Secretary shall distribute tribal supplemental funding among Indian tribes within such region as follows:
(aa)
Tribal supplemental amounts.—
The Secretary shall determine—
(AA)
which such Indian tribes would be entitled under subparagraph (A) to receive in a fiscal year less funding than they would receive in fiscal year 2011 pursuant to the relative need distribution factor and population adjustment factor, as described in subpart C of part 170 of title 25, Code of Federal Regulations (as in effect on the date of enactment of the MAP–21); and
(BB)
the combined amount that such Indian tribes would be entitled to receive in fiscal year 2011 pursuant to such relative need distribution factor and population adjustment factor in excess of the amount that they would be entitled to receive in the fiscal year under subparagraph (B).
(bb)
Combined amount.—
Subject to subclause (III), the Secretary shall distribute to each Indian tribe that meets the criteria described in item (aa)(AA) a share of funding under this subparagraph in proportion to the share of the combined amount determined under item (aa)(BB) attributable to such Indian tribe.
(III)
Ceiling.—
An Indian tribe may not receive under subclause (II) and based on its tribal share under subparagraph (A) a combined amount that exceeds the amount that such Indian tribe would be entitled to receive in fiscal year 2011 pursuant to the relative need distribution factor and population adjustment factor, as described in subpart C of part 170 of title 25, Code of Federal Regulations (as in effect on the date of enactment of the MAP–21).
(IV)
Other amounts.—
If the amount made available for a region under subclause (I) exceeds the amount distributed among Indian tribes within that region under subclause (II), the Secretary shall distribute the remainder of such region’s funding under such subclause among all Indian tribes in that region in proportion to the combined amount that each such Indian tribe received under subparagraph (A) and subclauses (I), (II), and (III).