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Updated March 14, 2023

Water Resources Development Acts: Primer

The U.S. Army Corps of Engineers (USACE) is a
Department of Defense agency that develops water resource
projects, principally to improve navigable channels, reduce
flood and storm damage, and restore aquatic ecosystems.
Congress often considers, on a biennial schedule, omnibus
legislation to authorize USACE water resource activities.
Congress regularly refers to this legislation as a Water
Resources Development Act (WRDA). WRDAs are
distinguished from each other by the year of enactment
(e.g., WRDA 1986). Authorization is generally a
precondition for USACE activities to be eligible for federal
appropriations.
WRDA provisions generally add to or amend existing
USACE authorizations and provide congressional policy
direction to the agency. Drivers for enactment of a new
WRDA typically include nonfederal and congressional
interest in new USACE studies and projects as well as
adjustments to existing USACE projects, programmatic
authorities, and policies. Events such as droughts and
floods, along with congressional deliberations on
infrastructure investments and other policy initiatives, may
shape deliberations of USACE authorization legislation in
the 118th Congress.
Consideration and Enactment of WRDAs
Congress typically consolidates USACE authorization
proposals into a WRDA bill rather than deliberating on
multiple bills of smaller scope. Historically, most WRDA
provisions have focused on USACE's water resource
activities; however, on some occasions, provisions have
addressed the agency's other responsibilities (such as its
regulatory responsibilities).
WRDAs have been enacted as stand-alone bills (e.g., in
2000, 2007, and 2014) and as part of broader bills (e.g., in
2016, 2018, 2020 and 2022). WRDA 2022 was enacted in
December 2022 as Title LXXXI of Division H of the James
M. Inhofe National Defense Authorization Act for Fiscal
Year 2023 (FY2023 NDAA; P.L. 117-263). For more on
WRDA 2022, see CRS Insight IN 11965, Water Resources
Development Act of 2022 (WRDA 2022).
USACE Activities and WRDA Authorizations
Although the three primary purposes of USACE studies and
projects historically have been improving navigation,
reducing flood risk, and restoring aquatic ecosystems, many
USACE projects are multipurpose-that is, they might
provide water supply storage, recreation, and hydropower,
among other benefits, in addition to one or more of the
three primary purposes. USACE is directly engaged in the
planning and construction of water resource projects.

In WRDAs, Congress generally establishes a general
framework and guidelines for implementing USACE water
resource projects and activities (e.g., setting standard
federal and nonfederal cost shares). WRDAs also authorize
USACE to perform specific studies and projects. Most
USACE water resource projects require two types of
congressional authorization, which are provided at different
points in time: (1) authority to study the feasibility of the
project and (2) authority to construct (and operate and
maintain, as applicable) the project. Authorizations for most
USACE studies and projects are geographically specific
(e.g., a flood risk reduction project for a specific
community along a river or coast).
WRDAs also may adjust the required cost sharing for
specific projects or activities, or they may authorize
USACE to provide specific financial assistance. For
example, in WRDAs since 1992, Congress has authorized
USACE to assist with environmental infrastructure (e.g.,
design and construction assistance for municipal drinking
water and wastewater infrastructure) in designated
communities, counties, and states. For more on this
assistance, see CRS Report R47162, Overview of U.S. Army
Corps of Engineers Environmental Infrastructure (EI)
Assistance.
Authorization for a project or activity on its own is not
sufficient for USACE to proceed; once Congress authorizes
an activity in a WRDA, USACE must still receive funding
for that activity (e.g., Investigation account funding to
complete an authorized study). Congress provides
appropriations for USACE through the annual Energy and
Water Development appropriations process and, at times,
through supplemental appropriations. Most USACE
appropriations are directed toward specific USACE studies
and projects authorized by Congress. For more on USACE
funding, see CRS Report R46320, U.S. Army Corps of
Engineers: Annual Appropriations Process, and CRS In
Focus IF11945, U.S. Army Corps of Engineers:
Supplemental Appropriations.
Although most USACE authorizations do not expire,
Congress has limited the duration of some WRDA
provisions (e.g., a 10-year pilot program authorization).
WRDA provisions may extend or remove the time
limitations on these authorities. WRDA provisions also may
rescind authority for (i.e., deauthorize) unconstructed
projects or projects no longer serving their authorized
purposes.
WRDA Development and Process to Propose
Activities for Authorization
To develop WRDAs, the authorizing committees for
USACE-the House Committee on Transportation and

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