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The volume of surface runoff flowing down dry channels of water- sheds in arid, semiarid, or subhumid climates may be reduced by transmission losses (NEH, part NRCS (2009b). Part 630 Hydrology National Engineering Handbook, Chapter 7 Hydrologic Soil Groups. Part 630National Engineering HandbookWatershed Project EvaluationProceduresChapter2(210–VI–NEH, Amend. 54, April 2012)The U.S. Department of AgriculturePart 630. National Engineering Handbook. Design Hydrographs. Chapter 21. (210–VI–NEH, draft August more hydrologic subareas, hydrographs should be de-. (210–VI–NEH, Amend. 77, November 2015). Chapter 6 Stream Reaches and Hydrologic Units Part 630. National Engineering Handbook National Engineering Handbook: Part 630 - Hydrology. Author: USDA Natural Resources Conservation Service (NRCS). Originally published as NEH-4 Hydrology by Part 630 - Hydrology. Chapter 1 - Introduction. (09/1997). 630.0100 Introduction. 630.0101 Duties and responsibilities of NRCS hydrologists. National Engineering Handbook Hydrology Chapters. NEH Part 630 Hydrology (Chapters from eDirectives site) or download individual chapters below: as chapter 5 of the Soil Conservation Service (SCS) National Engineering Handbook, Section 4 (NEH–4). This chapter was reprinted with minor revisions in 1969.