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A combined GIS-HEC procedure for floodplain analyses [electronic resource]

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Bibliographic Details
Online Access:	Online Access
Corporate Author:	Los Alamos National Laboratory (Researcher)
Format:	Government Document Electronic eBook
Language:	English
Published:	Washington, D.C. : Oak Ridge, Tenn. : United States. Department of Energy ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy, 1991.
Subjects:	Computer Graphics. G Codes. Mapping. H Codes. Watersheds. Data Base Management. Information Systems. Lanl. Topography. Waste Management. Computer Codes. Management. National Organizations. Us Doe. Us Organizations. Energy Planning, Policy And Economy. Environmental Sciences.

Description
Abstract:	The Hydrologic Engineering Center's Flood-Hydrograph (HEC-1) and Water Surface Profile (HEC-2) models are routinely used to define floodplain elevations. Detailed topographic data are commonly available from graphic information systems (GIS). These disjointed technologies can be combined if the GIS system has a drainage recognition capability. A conceptual procedure is suggested for incorporating this feature into the GIS framework so that cross- sectional information can be extracted and exported to HEC-2. A combined GIS-HEC application in ungaged watersheds at Los Alamos National Laboratory is described. This floodplain mapping procedure uses topographic data from the Laboratory's MOSS graphic information system. About 65% of the Laboratory has two foot topographic contour interval coverage, while 35% has ten foot coverage. Targeted stream channel segments are initially specified in the MOSS system, and topographic profiles along stream-channel cross-sections are extracted automatically. Each 2-D profile is stored as a 3-D MOSS line feature using New Mexico State Plane coordinates. This procedure is initiated at a convenient downstream location within each watershed, and proceeds upstream to a selected termination point. These 3-D line features are then exported in a format satisfying HEC-2 input data requirements.
Item Description:	Published through SciTech Connect. 01/01/1991. "la-ur-91-3948" " conf-911279--1" "DE92005069" 8. national MOSS users conference, Bozeman, MT (United States), 10-13 Dec 1991. McLin, S.G.; Fuller, G.W.
Physical Description:	Pages: (10 p) : digital, PDF file.