; (ii) the impact of formula methodologies on rural areas and Tribal areas; (iii) adjustments to improve targeting to the most serious needs; (iv) objective criteria for grantee capacity and concentration of damage to inform grantee determinations and minimum allocation thresholds; and (v) research and data to inform an additional amount to be provided for mitigation depending on type of disaster, which shall be not more than 30 percent of the total estimate of unmet needs. (5) Regulations (A) In general The Secretary shall, by regulation, establish a formula to allocate assistance from the Fund to the most impacted and distressed areas resulting from a catastrophic major disaster. (B) Formula requirements The formula established under subparagraph (A) shall— (i) set forth criteria to determine that a major disaster is catastrophic, which criteria shall consider the presence of a high concentration of damaged housing or businesses that individual, State, Tribal, and local resources could not reasonably be expected to address without additional Federal assistance or other nationally encompassing data that the Secretary determines are adequate to assess relative impact and distress across geographic areas; (ii) include a methodology for identifying most impacted and distressed areas, which shall consider unmet serious needs related to housing, economic revitalization, and infrastructure; (iii) include an allocation calculation that considers the unmet serious needs resulting from the catastrophic major disaster and an additional amount up to 30 percent for activities to reduce risks of loss resulting from other natural disasters in the most impacted and distressed area, primarily for the benefit of low- and moderate-income persons, with particular focus on activities that reduce repetitive loss of property and critical infrastructure