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Uncertainty Analysis of the FEMA Method for Alluvial Fans

by Bing Zhao, Arizona State Univ,
Larry W. Mays, Arizona State Univ,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

Distributary flow areas such as alluvial fans, bajadas, and alluvial slopes, and alluvial plains along mountain bases pose quite different and interesting problems for the design of hydraulic structures and highway crossings. The FEMA method is only at best an approximate method that ignores fundamental hydraulics. The hydrologic and hydraulic analysis of alluvial fans has many associated uncertainties that are ignores in the FEMA method. This paper explores some of those uncertainties and presents methodologies for their analysis.

Subject Headings: Alluvial channels | Uncertainty principles | Hydraulic structures | Hydraulic design | Federal government | Structural analysis | Slopes

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