Neither the ownership limitations of this subchapter nor the ownership limitations of any other provision of Federal reclamation law shall apply to lands which receive only a temporary, not to exceed one year, supply of water made possible as a result of-
(1) an unusually large water supply not otherwise storable for project purposes; or
(2) infrequent and otherwise unmanaged flood flows of short duration.
The Secretary shall have the authority to waive payments for a supply of water described in subsection (a).
(
Federal reclamation law, referred to in subsec. (a), is defined in section 390aa of this title.