The Federal share for assistance provided under this subchapter shall be equal to not less than 75 percent of the eligible costs.
Except as provided in paragraph (2), total assistance provided under this subchapter for a single emergency shall not exceed $5,000,000.
The limitation described in paragraph (1) may be exceeded when the President determines that-
Whenever the limitation described in paragraph (1) is exceeded, the President shall report to the Congress on the nature and extent of emergency assistance requirements and shall propose additional legislation if necessary.
42 U.S.C. § 5193