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National Engineering Handbook: Chapter 6 - Stream Reaches and Hydrologic Units

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Natural Resources Conservation Service, 2015



The stream system of a watershed is divided into reaches, and the watershed into hydrologic units (HU), for the convenience of work as a part of a hydrologic or hydraulic study. This chapter provides some details on the selection of reaches for hydrologic or economic studies, presents alternative means for studies of alluvial fans, and briefly describes a hydrologic unit and its use in a study.


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Revision ID: 5876
Revision Date: 12/16/2022