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The details of these options can be found in the TR - 20 Manual ( SCS , 1982 ) which is available from the National Technical Information Service .Author: USDA Soil Conservation Service (SCS) 4) The TR-20 manual is primarily an operating manual for the TR-20 program. As such, it is of limited use This web page uses tr55 and scs 186 interchangeably. Including both tr20 and tr 55 manuals available for download. The runoff curve number is an empirical The document describing this program was released as an SCS technical release TR-20 “Computer Program for Project Formulation Hydrology” in 1982 (SCS, SCS (1982) “TR-20 Computer Program for Project Formulation Hydrology,” Tech., Release No. 20, Washington, D.C., May. SCS (1986) (USDA Soil Conservation SCS Runoff Hydrograph Dialog Box . Importing and Manually Inputting Hydrograph Data . This method is also used in SCS TR-20. The Soil Conservation Service (SCS, now. NRCS) first developed the National Engineer- ing Handbook, Section 4, Hydrology (NEH-4) as. The SCS Engineering Division made numerous modifications over the years, and a PC version of the program came out with a draft User Manual in 1986.