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    Geomorphic Assessment of Flood-Prone Areas on the Southern Piedmont of the Tortolita Mountains, Pima County, Arizona

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    Author
    Pearthree, P.A.
    Demsey, K.A.
    Onken, J.A.
    Vincent, K.R.
    House, P.K.
    Issue Date
    1991
    Keywords
    Arizona Geological Survey Open File Reports
    Arizona
    Pima County
    Tortolita Mountains
    hydrology
    geomorphology
    map
    Geology
    geomorphic
    piedmont
    hazard
    Flood-Prone
    Quaternary
    Pleistocene
    Holocene
    Recent
    North Ranch
    Wild Burro Wash
    Ruelas Wash
    Prospect Wash
    Canada Agua West
    Canada Agua East
    distributary channel
    Alluvial-fan methodology
    AFM
    FEMA
    archaeology
    sheetflow
    flood mitigation
    Flood Hazard
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    Citation
    Pearthree, P.A., Demsey, K.A., Onken, J.A., Vincent, K.R., and House, P.K., 1991, Geomorphic Assessment of Flood-Prone Areas on the Southern Piedmont of the Tortolita Mountains, Pima County, Arizona. Arizona Geological Survey Open File Report, OFR-91-11, 3 map sheets, map scales 1:12,000 and 1:24,000, 31 p.
    Publisher
    Arizona Geological Survey (Tucson, AZ)
    Description
    The character of flooding and the extent of flood-prone areas on the southern piedmont of the Tortolita Mountains have been disputed by local and federal flood plain management officials since at least 1987. Flood insurance rate maps (FIRMs) promulgated by the Federal Emergency Management Agency (FEMA) depict much of the Tortolita piedmont as being subject to alluvial-fan flooding. Officials of the Pima County Flood Control District have argued that 100-year floodplains delineated on these FIRMs include extensive areas that are not flood prone, and that the alluvial-fan methodology used to develop these maps is not appropriate for the Tortolita piedmont. We conducted a geomorphic analysis of the southern piedmont of the Tortolita Mountains in northern Pima County to critically evaluate the floodplain designations derived using the FEMA alluvial-fan methodology (AFM) (Dawdy, 1979; FEMA, 1985; 1989). The geomorphic character of a piedmont provides a long record of flooding events that is independent of specific hydrologic models because it reflects the cumulative effects of thousands of years of flooding. Drainage patterns, surface topography, soil development, vegetation, and stratigraphic studies were used to assess the character of flooding and the extent of flood-prone areas on the piedmont. We differentiated and mapped alluvial surfaces of the following ages: <100 years; < 5,000 years; 5,000 to 20,000 years; 20,000 to 100,000 years; and >100,000 years.
    URI
    http://hdl.handle.net/10150/630981
    Additional Links
    https://library.azgs.arizona.edu/item/AOFR-1552431369579-192
    Language
    en
    Series/Report no.
    OFR-91-11
    Rights
    Arizona Geological Survey. All rights reserved.
    Collection Information
    Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.
    North Bounding Coordinate
    32.509
    South Bounding Coordinate
    32.3432
    West Bounding Coordinate
    -111.168
    East Bounding Coordinate
    -110.984
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