; or (II) in the case of a rural desalination project, the applicable percentage determined in accordance with clause (ii). (ii) Rural desalination projects (I) Cost-sharing requirement for appraisal studies Subject to subclause (IV), in the case of a rural desalination project carried out under this subsection, the Federal share of the cost of appraisal studies for the rural desalination project shall be— (aa) 75 percent of the total costs of the appraisal studies, up to $200,000; and (bb) if the total costs of the appraisal studies are more than $200,000, 50 percent of any amounts over $200,000. (II) Cost-sharing requirement for feasibility studies Subject to subclause (IV), in the case of a rural desalination project carried out under this subsection, the Federal share of the cost of feasibility studies for the rural desalination project shall be not more than 50 percent. (III) Cost-sharing requirement for construction costs Subject to subclause (IV), in the case of a rural desalination project carried out under this subsection, the Federal share of the cost of construction of the rural desalination project shall be not more than 75 percent. (IV) Reduction in non-federal share The Secretary may reduce the non-Federal share of a rural desalination project required under subclause (I), (II), or (III) by not more than 10 percent if the Secretary determines, after consultation with the heads of any other Federal agencies that are partners in the rural desalination project and in accordance with applicable Reclamation standards, that the reduction is appropriate due to— (aa) an overwhelming Federal interest in the rural desalination project