This web site contains most NRCS Economic and Watershed Technical Notes in chronological order, 2013 going back to the 1950s. Additional NRCS technical references are available at the main NRCS technical reference sites. Many of these technical notes are obsolete, and mainly included here for archival purposes. These older Technical Notes can be used for training purposes and to understand older watershed evaluations, needed when reviewing a 50-year-old dam for repairs. State Economic Technical Notes are also listed at the bottom of this page.