Design Depths and Velocities on Alluvial Fans

by Edward R. Mifflin, Michael Baker Jr Inc, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract: Under Federal Emergency Management Agency (FEMA) guidelines, flood depths and velocities on alluvial fans are determined by considering the probability of a given point on the alluvial fan being hit by a flood following an unpredictable path. When determining a design depth and velocity, the size of the proposed project must be considered. As the area of the alluvial fan occupied by the project increases the chances of the project being hit by a given flood increase. This paper presents a methodology that uses the size of the area at risk to determine design depths and velocities on alluvial fans. An example is given to illustrate the methodology itself and to demonstrate the different ways that the methodology is applied for flood insurance and design purposes.

Subject Headings: Floods | Alluvial channels | Federal government | Risk management | Sediment transport | Fluid velocity | Hydraulic design | Probability

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