EF = a - b1 * (state factor) - b2 * (area factor).
If EF is one or more, the project is eligible for the full reduction in cost-share to the benefits based floor. If EF is zero or less, the project is not eligible for a reduction. If EF is between zero and one, the non-Federal cost-share will be reduced proportionately to an amount which is greater than the BBF but less than the standard non-Federal cost-share in accordance with the procedures described in paragraph § 241.5(c) of this part. The values of a, b1 and b2 will be determined by HQUSACE. The parameter values will be based on the latest available data and set so that 20 percent of counties have an EF of 1.0 or more, while 66.7 percent have an EF of 0 or less. These values will be adjusted periodically as new information becomes available. Changes will be published in Engineering Circulars. The values will be set so that b2 = 2 * b1, giving local income twice the weight of state income.
non-Federal cost-share = 50 - EF * (50 - BBF)
non-Federal cost-share = (LERRD + 5) - ER * [(LERRD + 5) - BBF]
non-Federal cost-share = 25 - EF * (25 - BBF)
non-Federal cost-share = 25 - EF * (25 - BBF)
33 C.F.R. §241.5