Techniques and Methods 11–C6
The drainage basin is a fundamental hydrologic entity used for studies of surface-water resources and during planning of water-related projects. Numeric drainage areas published by the U.S. Geological Survey water science centers in Annual Water Data Reports and on the National Water Information Systems (NWIS) Web site are still primarily derived from hard-copy sources and by manual delineation of polygonal basin areas on paper topographic map sheets. To expedite numeric drainage area determinations, the Colorado Water Science Center developed a digital database structure and a delineation methodology based on the hydrologic unit boundaries in the National Watershed Boundary Dataset. This report describes the digital database architecture and delineation methodology and also presents the results of a comparison of the numeric drainage areas derived using this digital methodology with those derived using traditional, non-digital methods. (Please see report for full Abstract)
First posted October 4, 2012
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Dupree, J.A., and Crowfoot, R.M., 2012, Digital database architecture and delineation methodology for deriving drainage basins, and a comparison of digitally and non-digitally derived numeric drainage areas: U.S. Geological Survey Techniques and Methods, book 11, chap. C6, 59 p.
Digital Database Architecture
Comparison of Digitally and Non-Digitally Derived Numeric Drainage Areas
Appendix 1. Procedures and Guidelines for Delineating Basins
Appendix 2. Guidelines for Geodatabase Scope, Drainage-Basin Delineation, and Geodatabase Management