U.S. Army Corps of Engineers: Annual Appropriations Process and Issues for Congress [April 21, 2020] [open pdf - 1MB]
From the Summary: "The U.S. Army Corps of Engineers (USACE) is an agency within the Department of Defense with both military and civil works responsibilities. The agency's civil works activities consist largely of the planning, construction, and operation of water resource projects to maintain navigable channels, reduce the risk of flood and storm damage, and restore aquatic ecosystems. Congress directs USACE's civil works activities through authorization legislation, annual and supplemental appropriations, and oversight. Unlike federal funding for highways and municipal water infrastructure, the majority of federal funds provided to USACE are not distributed by formula to states or through competitive grant programs. Instead, USACE generally is directly engaged in the planning and construction of projects. The majority of the agency's appropriations are used to perform work on geographically specific studies and congressionally authorized projects."
CRS Report for Congress, R46320
Congressional Research Service: https://crsreports.congress.gov/