; and (B) that has received emergency flood-fighting assistance, including construction of temporary barriers by the Secretary, under section 5 of the Act of August 18, 1941 ( 33 U.S.C. 701n ) with respect to such flood events. (2) Natural feature; nature-based feature The terms natural feature and nature-based feature have the meanings given those terms in section 1184 of the Water Resources Development Act of 2016 ( 33 U.S.C. 2289a ). (b) Program (1) In general The Secretary is authorized to carry out a program to study, design, and construct water resources development projects through measures involving, among other things, strengthening, raising, extending, realigning, or otherwise modifying existing flood control works, designing new works, and incorporating natural features, nature-based features, or nonstructural features, as appropriate to provide flood and coastal storm risk management to affected communities. (2) Considerations In carrying out paragraph (1), the Secretary shall, to the maximum extent practical, review and, where appropriate, incorporate natural features or nature-based features, or a combination of such features and nonstructural features, that avoid or reduce at least 50 percent of flood or storm damages in one or more of the alternatives included in the final alternatives evaluated. (3) Construction (A) In general The Secretary may carry out a project described in paragraph (1) without further congressional authorization if— (i) the Secretary determines that the project— (I) is advisable to reduce the risk of flooding for an affected community; and (II) produces benefits that are in excess of the estimated costs