The USDA NRCS has many engineering analysis and design documents available download and use.
Topics include: Agriculture, Conservation, Construction, Dams, Drafting/Drawings, Drainage, Ecology, Geology, Hydraulics, Hydrology, Irrigation, Landscape Architecture, Quality Assurance, Sediment, Soils, Specifications, Stormwater Management, Streams/Channels, Structures, Surveying, Water Supply, Water Quality
These are available for download at "http://www.info.usda.gov/CED/".
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