Alluvial Fan Flooding and Development Alternativesby James H. Nelson, Cella Barr Associates, United States,
Abstract: The Federal Emergency Management Agency (FEMA) utilizes a methodology which examines the probability of an incised channel forming at any given location across the fan, in consideration of its radial distance from the fan apex. Methods of flood proofing which will function for an individual development project while integrating into an overall watershed management plan are often the only practical options available. An approach to this concept, which is presently being utilized in Pima County, Arizona, includes adequate watershed planning to define and establish drainage corridors. Development projects must provide structural measures on-site to account for the possibility of upstream avulsion as an interim measure until such time as watershed development is sufficiently saturated to fix the alignment of the drainage corridors.
Subject Headings: Floods | Watersheds | Alluvial channels | Flow measurement | Channel flow | Drainage | Management methods | Flow control | Federal government | Arizona | North America | United States
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