Water Resources Development Act (WRDA), is a reference to public laws enacted by Congress to deal with various aspects of water resources: environmental, structural, navigational, flood protection, hydrology, etc.
Typically, the United States Army Corps of Engineers administers the bulk of the Act's requirements.
There are several WRDAs:
Water Resources Development Act of 1974, WRDA 1974, Pub.L. 93–251Water Resources Development Act of 1976, WRDA 1976, Pub.L. 94–587Water Resources Development Act of 1986, WRDA 1986, Pub.L. 99–662 (WRDA86.pdf, via TaxPayer.net)Water Resources Development Act of 1988, WRDA 1988, Pub.L. 100–676Water Resources Development Act of 1990, WRDA 1990, Pub.L. 101–640Water Resources Development Act of 1992, WRDA 1992, Pub.L. 102–580Water Resources Development Act of 1996, WRDA 1996, Pub.L. 104–303Water Resources Development Act of 1999, WRDA 1999, Pub.L. 106–53Water Resources Development Act of 2000, WRDA 2000, Pub.L. 106–541Water Resources Development Act of 2007, WRDA 2007, Pub.L. 110–114Water Resources Development Act of 2014, WRDA 2014, Pub.L. 113–121