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42 U.S. Code § 4101b. National Flood Mapping Program
(a) Reviewing, updating, and maintaining maps
The Administrator, in coordination with the Technical Mapping Advisory Council established under section 4101a of this title, shall establish an ongoing program under which the Administrator shall review, update, and maintain National Flood Insurance Program rate maps in accordance with this section.
(b) Mapping
(1) In generalIn carrying out the program established under subsection (a), the Administrator shall—
(A) identify, review, update, maintain, and publish National Flood Insurance Program rate maps with respect to—
(i)
all populated areas and areas of possible population growth located within the 100-year floodplain;
(ii)
all populated areas and areas of possible population growth located within the 500-year floodplain;
(iii)
areas of residual risk, including areas that are protected by levees, dams, and other flood control structures;
(iv)
areas that could be inundated as a result of the failure of a levee, dam, or other flood control structure;
(v)
areas that are protected by non-structural flood mitigation features; and
(vi)
the level of protection provided by flood control structures and by non-structural flood mitigation features;
(B)
establish or update flood-risk zone data in all such areas, and make estimates with respect to the rates of probable flood caused loss for the various flood risk zones for each such area; and
(C)
use, in identifying, reviewing, updating, maintaining, or publishing any National Flood Insurance Program rate map required under this section or under the National Flood Insurance Act of 1968 (42 U.S.C. 4011 et seq.), the most accurate topography and elevation data available.