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neh4-chap7 - Part 630 Hydrology National Engineering...

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(210–VI–NEH, January 2009) United States Department of Agriculture Natural Resources Conservation Service Part 630 Hydrology National Engineering Handbook Chapter 7 Hydrologic Soil Groups Rain clouds Cloud formation Precipitation T r a n s p i r a t i o n f r o m s o i l f r o m o c e a n T r a n s p i r a t i o n Ocean Ground water Rock Deep percolation Soil Percolation Infiltration Surface runoff E v a p o r at i o n f r o m v e g e t a t i o n f r o m s t r e a m s Evaporation
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Part 630 National Engineering Handbook Hydrologic Soil Groups Chapter 7 (210–VI–NEH, January 2009) Issued January 2009 The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, re- prisal, or because all or a part of an individual’s income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communica- tion of program information (Braille, large print, audiotape, etc.) should contact USDA’s TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, SW., Washington, DC 20250–9410, or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer.
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7–i (210–VI–NEH, January 2009) Acknowledgments Chapter 7 was originally prepared by Victor Mockus (retired) and re- printed with minor revisions in 1972. This version was prepared by the U.S. Department of Agriculture, Natural Resources Conservation Service (NRCS) under guidance of Jon Werner (retired), NRCS; with assistance from Donald E. Woodward (retired), NRCS; Robert Nielsen (retired), NRCS; Robert Dobos , soil scientist, NRCS; and Allen Hjelmfelt (re- tired), Agricultural Research Service. It was finalized under the guidance of Claudia C. Hoeft , national hydraulic engineer.
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Part 630 National Engineering Handbook Hydrologic Soil Groups Chapter 7 7–ii (210–VI–NEH, January 2009)
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7–iii (210–VI–NEH, January 2009) Preface This chapter of the National Engineering Handbook (NEH) Part 630, Hydrology, represents a multi-year collaboration between soil scientists at the National Soil Survey Center (NSSC) and engineers in the Conservation Engineering Division (CED) at National Headquarters to develop an agreed upon model for classifying hydrologic soil groups. This chapter contains the official definitions of the various hydrologic soil groups. The National Soil Survey Handbook (NSSH) references and refers users to NEH630.07 as the official hydrologic soil group (HSG) reference. Updating the hydrologic soil groups was originally planned and developed based on this perspective.
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