Natural Resources Conservation Service National Engineering Handbook
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| Natural Resources Conservation Service National Engineering Handbook | |
|---|---|
| Name | Natural Resources Conservation Service National Engineering Handbook |
| Caption | Cover of a typical edition |
| Country | United States |
| Publisher | United States Department of Agriculture |
| Subject | Soil conservation, watershed management, civil engineering |
| Language | English |
Natural Resources Conservation Service National Engineering Handbook
The National Engineering Handbook is a technical manual compiled to guide field engineering practices associated with the United States Department of Agriculture, with ties to agencies such as the United States Forest Service, United States Geological Survey, and the National Oceanic and Atmospheric Administration. It supports implementation efforts by entities including the Environmental Protection Agency, Bureau of Reclamation, Army Corps of Engineers, and state agricultural extensions, and is referenced by professional societies such as the American Society of Civil Engineers and the Soil Science Society of America. The handbook interfaces with legislation and programs administered by the Natural Resources Conservation Service, the Farm Service Agency, the United States Fish and Wildlife Service, and regional planning bodies.
Overview
The handbook provides guidelines on watershed planning, erosion control, hydrology, hydraulic structures, and soils engineering used by practitioners from the United States Department of Agriculture, the Department of the Interior, and state conservation districts such as the Soil Conservation Service predecessors. It synthesizes research from institutions including the United States Geological Survey, Agricultural Research Service, National Aeronautics and Space Administration studies, and collaborates with universities like Iowa State University, University of California, Davis, and Texas A&M University. It is cited in manuals produced by the Army Corps of Engineers, Bureau of Reclamation, Environmental Protection Agency, and the Federal Emergency Management Agency for design and risk assessment, and informs standards considered by the American Society of Civil Engineers and the American Society for Testing and Materials.
History and Development
Development of the handbook traces to efforts by the Soil Conservation Service during the Dust Bowl era and subsequent New Deal programs linked to the Tennessee Valley Authority, Civilian Conservation Corps, and Works Progress Administration projects. Key historical influences include research funded by the National Science Foundation, policy shifts under administrations from Franklin D. Roosevelt to recent presidents, and programmatic alignment with the Conservation Reserve Program and the Food Security Act. Contributors and reviewers have included engineers and scientists from institutions such as the United States Army Corps of Engineers, United States Forest Service, National Research Council, and land-grant universities like Cornell University and University of Illinois. International exchanges with agencies such as Agriculture and Agri-Food Canada, CSIRO, and the Food and Agriculture Organization informed methodologies adopted in successive editions, paralleling guidance from organizations like the International Commission on Irrigation and Drainage.
Organization and Content of the Handbook
The handbook is organized into parts and chapters covering topics such as hydrology, hydraulics, soil mechanics, conservation structures, watershed modeling, and dam safety, paralleling technical documentation from the Bureau of Reclamation and Army Corps of Engineers. It includes engineering appendices with computational procedures used by practitioners in USDA field offices, references to research from institutions like Purdue University, Colorado State University, and University of Minnesota, and incorporates standards recognized by the American Concrete Institute and American Society for Testing and Materials. Content cross-references material from the National Oceanic and Atmospheric Administration for precipitation frequency data, United States Geological Survey streamflow records, and mapping resources from the United States Geological Survey and National Geospatial-Intelligence Agency. The handbook’s chapters are used alongside guidance from the Environmental Protection Agency, Federal Highway Administration, and state departments of transportation.
Technical Standards and Practices
Technical standards in the handbook address design criteria for structures such as weirs, spillways, terraces, and retention basins, reflecting practices endorsed by the Army Corps of Engineers, American Society of Civil Engineers, and Bureau of Reclamation. Hydrologic methods reference datasets and methodologies from the National Weather Service, National Oceanic and Atmospheric Administration, and United States Geological Survey, while soil behavior and classification draw on standards from the Soil Science Society of America and the American Association of State Highway and Transportation Officials. Design of structures considers safety and environmental compliance intersecting with statutes and programs administered by the Environmental Protection Agency, Fish and Wildlife Service, and State Historic Preservation Offices. For floodplain management, practitioners coordinate with Federal Emergency Management Agency maps and guidance, and align with policy frameworks shaped by the National Research Council and Congressional legislation.
Implementation and Use in Conservation Programs
Field implementation uses the handbook for conservation practices in programs such as the Conservation Reserve Program, Environmental Quality Incentives Program, and Wetlands Reserve Program administered by USDA agencies and coordinated with state conservation districts and extension services at land-grant universities like Michigan State University and University of Florida. Engineers in Soil and Water Conservation Districts, Army Corps of Engineers districts, and Bureau of Reclamation offices apply handbook procedures during planning, design, and inspection stages, often in partnership with non-governmental organizations like The Nature Conservancy and regional watershed councils. Training and certification efforts reference curricula from professional bodies such as the American Society of Civil Engineers, American Water Resources Association, and the National Society of Professional Engineers.
Updates, Revisions, and Digital Access
Revisions to the handbook are managed through internal review processes with contributions from USDA agencies, academic experts from universities such as North Carolina State University and Virginia Tech, and technical input from the National Research Council and professional societies. Updates incorporate improved methodologies from research at institutions including the Agricultural Research Service, United States Geological Survey, and National Oceanic and Atmospheric Administration, and reflect interoperable data standards used by the National Geospatial-Intelligence Agency and state geospatial programs. Digital access complements printed editions, interoperating with Federal digital repositories, state technical manuals, and software tools used by practitioners trained through programs at universities and professional organizations.