Alluvial fan flooding definition

Alluvial fan flooding means flooding occurring on the surface of an alluvial fan or similar landform which originates at the apex and is characterized by high-velocity flows; active processes of erosion, sediment transport, and deposition; and unpredictable flow paths.
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Alluvial fan flooding means a fan-shaped sediment deposit formed by a stream that flows from a steep mountain valley or gorge onto a plain or the junction of a tributary stream with the main stream. Alluvial fans contain active stream channels and boulder bars, and recently abandoned channels. Alluvial fans are predominantly formed by alluvial deposits and are modified by infrequent sheet flood, channel avulsions and other stream processes.
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Alluvial fan flooding means flooding occurring on the surface of an alluvial fan or similar landform which originates at t he apex and i s c haracterized b y hi gh-velocity f lows, active pr ocesses of erosion, sediment transport, and deposition, and unpredictable flow paths.
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Examples of Alluvial fan flooding in a sentence

  • Alluvial Fan Flooding means flooding occurring on the surface of an alluvial fan or similar landform that originates at the apex.

  • Section A: Three-Stage Analysis The three-stage analysis of alluvial fans is described in the Federal Emergency Management Agency’s (FEMA's) Consolidated Guidelines and Specifications for Flood Hazard Mapping Partners, Appendix G: Guidance for Alluvial Fan Flooding Analyses and Mapping, which can be obtained from the Federal Emergency Management Agency’s (FEMA’s) Internet site at http://www.fema.gov/fhm/dl_cgs.shtm.

  • Section A: Three-Stage Analysis The three-stage analysis of alluvial fans is described in the Federal Emergency Management Agency’s (DHS- FEMA's) Consolidated Guidelines and Specifications for Flood Hazard Mapping Partners, Appendix G: Guidance for Alluvial Fan Flooding Analyses and Mapping, which can be obtained from the Federal Emergency Management Agency’s (DHS-FEMA’s) Internet site at http://www.fema.gov/plan/prevent/fhm/dl_cgs.shtm.

  • Until this new guidance document is final, please continue to use Guidelines and Specifications for Flood Hazard Mapping Partners, Appendix G: Guidance for Alluvial Fan Flooding Analyses and Mapping.

  • SECTION A: THREE-STAGE ANALYSIS The three-stage analysis of alluvial fans is described in the Federal Emergency Management Agency’s (DHS- FEMA's) Guidelines and Specifications for Flood Hazard Mapping Partners, Appendix G: Guidance for Alluvial Fan Flooding Analyses and Mapping, which can be obtained from the Federal Emergency Management Agency’s (DHS-FEMA’s) Internet site at http://www.fema.gov/media-library/assets/documents/13948.

  • The approach, detailed in the Guidelines for Determining Flood Hazards on Alluvial Fans (February 2000), addresses recommendations in a 1996 report by the National Research Council’s (NRC’s) Committee on Alluvial Fan Flooding.

  • The administrator shall describe the course and give their reason(s).

  • However, it will be required after construction is complete and a revision to the Flood Insurance rate Map (FIRM) is requested.Section C: Mapping RequirementsWith the revision request, submit a certified topographic map showing the information indicated in the Mapping Requirements section of the Alluvial Fan Flooding Form.

  • Additional information also can be found in the National Research Council report entitled Alluvial Fan Flooding (National Research Council, 1996).

  • Determine the Boundaries of the Area Subject A5-6 to Alluvial Fan Flooding C.


More Definitions of Alluvial fan flooding

Alluvial fan flooding means a fan-shaped sediment deposit formed by a stream that flows from a steep mountain valley or gorge onto a plain or the junction of a tributary
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Alluvial fan flooding means flooding occurring on the surface of an alluvial fan or similar landform which originates at the apex and is characterized by
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Alluvial fan flooding means flooding occurring on the surface of an alluvial fan or similar
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Alluvial fan flooding means flooding occurring on the surface of an alluvial fan or similar landform which originates at the apex and is characterized by high-velocity flows; active processes of erosion, sediment transport, and deposition; and, unpredictable flow paths. “Apex” means a point on an alluvial fan or similar landform below which the flow path of the major stream that formed the fan becomes unpredictable and alluvial fan flooding can occur.
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Alluvial fan flooding means flooding occurring on the surface of an alluvial fan or similar landform, which originates at the apex and is characterized by high-velocity flows; active processes of erosion, sediment transport, and deposition; and unpredictable flow paths. For the purposes of the NFIP, "apex" means a point on an alluvial fan or similar landform below which the flowpath of the major stream that formed the fan becomes unpredictable and alluvial fan flooding can occur. The degree to which the processes that charac­terize alluvial fan flooding are present can vary greatly. For example, the fact that active deposition has not recently occurred on some portion of the fan surface does not necessarily preclude the use of FEMA's methodology for determining hazards from alluvial fan flooding.
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Alluvial fan flooding means flooding occurring on the surface of an alluvial fan or similar landform which originates at the apex and is characterized by high- velocity flows; active processes of erosion, sediment
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Related to Alluvial fan flooding

  • Flooding means a volume of water that is too great to be confined within the banks or walls of the stream, water body, or conveyance system and that overflows onto adjacent lands, thereby causing or threatening damage.

  • Industrial facility means any nongovernmental or non- residential facility that is used for activities such as agriculture, forestry, fishing, mining, manufacturing, transportation, commu- nications or providing services including electric, gas and sanitary services.

  • Special Fare means any fare other than a Normal Fare.

  • Area of shallow flooding means a designated AO or AH Zone on a community's Flood Insurance Rate Map (FIRM) with one percent or greater annual chance of flooding to an average depth of one to three feet where a clearly defined channel does not exist, where the path of flooding is unpredictable and indeterminate; and where velocity flow may be evident. Such flooding is characterized by ponding or sheet flow.

  • Vegetation means trees, shrubs, nursery stock and other vegetation and includes the limbs or growth of any Vegetation.

  • Floodplain or flood-prone area means any land area susceptible to being inundated by water from any source. See "Flood or flooding."

  • Weathertight means that in any sea conditions water will not penetrate into the ship.

  • Wildlife habitat means a surface water of the state used by plants and animals not considered as pathogens, vectors for pathogens or intermediate hosts for pathogens for humans or domesticated livestock and plants.

  • Gasohol means a blended fuel composed of gasoline and fuel grade ethanol.

  • Commercial Facility means the Commercial Facility made available under this Agreement as described in Clause 2.1 (Facility).

  • Tight-fitting facepiece means a respiratory inlet covering that forms a complete seal with the face.

  • Flood or flooding means a general and temporary condition of partial or complete inundation of normally dry land areas from:

  • Airborne radioactivity area means a room, enclosure, or area in which airborne radioactive materials, composed wholly or partly of licensed radioactive material, exist in concentrations:

  • Industrial furnace means any of the following enclosed devices that are integral components of manufacturing processes and that use thermal treatment to accomplish recovery of materials or energy:

  • 100-year floodplain means any area of land that:

  • Floodplain or "Flood-prone area" means any land area susceptible to being inundated by water from any source (see definition of "Flooding").

  • Sexual penetration means vaginal intercourse, cunnilingus, fellatio, or anal intercourse between persons or insertion of the hand, finger, or object into the anus or vagina either by the actor or upon the actor's instruction. The depth of insertion shall not be relevant to the question of commission of the crime;

  • Habitat means the physical and biological environment in which

  • Erosion means the detachment and movement of soil or rock fragments by water, wind, ice, or gravity.

  • Wildland means an area where development is generally limited to roads, railroads, power lines, and widely scattered structures. Such land is not cultivated (i.e., the soil is disturbed less frequently than once in 10 years), is not fallow, and is not in the United States Department of Agriculture (USDA) Conservation Reserve Program. The land may be neglected altogether or managed for such purposes as wood or forage production, wildlife, recreation, wetlands, or protective plant cover.

  • CAFRA Centers, Cores or Nodes means those areas with boundaries incorporated by reference or revised by the Department in accordance with N.J.A.C. 7:7-13.16.

  • Gravel means stone screened from river sand or quarried and washed free of clay and clay coatings. Concrete aggregate designated as Class II by the department of transportation is acceptable.

  • Residential facility means a home or facility that is licensed by the department of developmental disabilities under section 5123.19 of the Revised Code and in which a child with a developmental disability resides.

  • Mine drainage means any drainage, and any water pumped or siphoned, from an active mining area or a post-mining area. The abbreviation “ml/l” means milliliters per liter.

  • Fluoroscopic imaging assembly means a subsystem in which X-ray photons produce a visual image. It includes the image receptor(s) such as the image intensifier and spot-film device, electrical interlocks, if any, and structural material providing linkage between the image receptor and diagnostic source assembly.

  • Species means any group of animals classified as a species or subspecies as commonly accepted by the scientific community.