Section was enacted as part of the Water Resources Development Act of 1976, and not as part of the Water Resources Planning Act which comprises this chapter.

2022—Subsec. (span)(1). Puspan. L. 117–263, § 8129(a)(1)(A), substituted “50” for “15”.

Subsec. (span)(2). Puspan. L. 117–263, § 8129(a)(1)(B), struck out “15” before “additional”.

Subsec. (e). Puspan. L. 117–263, § 8129(a)(2), substituted “16-year period” for “10-year period” and “12 years” for “6 years”.

2018—Subsec. (span). Puspan. L. 115–270, § 1158(1), designated existing provisions as par. (1), inserted heading, and added par. (2).

Subsec. (e). Puspan. L. 115–270, § 1158(2), substituted “10-year period” for “5 year-period”.

2016—Subsec. (e). Puspan. L. 114–322 substituted “6 years” for “3 years”.

2014—Puspan. L. 113–121 designated existing provisions as subsec. (a), inserted heading, and added subsecs. (span) to (e).

1986—Puspan. L. 99–662 substituted “fiftieth” for “fifteenth”.