; and (3) provide for either— (A) the restoration of the eligible hydroelectric facility to full operation of its function as a primary water source and hydroelectric power supply; or (B) the establishment of an alternative primary water source and the restoration of the full operation of the hydroelectric power supply function of the eligible hydroelectric facility pursuant to the requirements of subsection (c). (c) Alternative contribution A contribution may cover the establishment of an alternative primary water source under subsection (b)(3)(B) only if— (1) the water source could provide redundancy to the water supply provided by an eligible hydroelectric facility; (2) the water source is approved by any applicable regulatory agencies; and (3) the cost of the establishment of such water source and the restoration of the full operation of the hydroelectric power supply function of the eligible hydroelectric facility is less than the cost of restoring the eligible hydroelectric facility to full operation as described under subsection (b)(3)(A). (d) Resiliency standards An improvement carried out under this section shall meet the definition of resilient developed pursuant to section 406(e) of the Robert T. Stafford Disaster Relief and Emergency Assistance Act ( 42 U.S.C. 5172(e) ). (e) Definition of eligible hydroelectric facility In this section, the term eligible hydroelectric facility means a hydroelectric facility that— (1) is part of a system that provides the primary water source for more than 200,000 people; (2) sustained damage eligible for financial assistance under section 406 of the Robert T. Stafford Disaster Relief and Emergency Assistance Act ( 42 U.S.C. 5172 ); (3) is licensed by the Federal Energy Regulatory Commission under part I of the Federal Power Act ( 16 U.S.C. 792 et seq.)