Floodplain

  • Anabranch (secondary or flood channel)

    Anabranch (secondary or flood channel)

    Anabranch (secondary or flood channel) Position: Floodplain   Form Pattern of coexistent multiple-anastomosing channels (repeated bifurcating and rejoining) with low...

  • Chute cutoff

    Chute cutoff

    Chute cutoff Position: Floodplain   Form Straight/gently curved channel that dissects the convex bend of the primary channel, short-circuiting...

  • Meander cutoff

    Meander cutoff

    Meander cutoff (neck cutoff, oxbow, billabong) Position: Floodplain   Form A meander bend that has been cut through the...

  • Floodout

    Floodout

    Floodout Position: Floodplain   Form Lobate/fan-shaped sand body that radiates downstream from an intersection point of a discontinuous channel...

  • Valley fill (swamp, swampy meadow)

    Valley fill (swamp, swampy meadow)

    Valley fill (swamp, swampy meadow) Position: Floodplain   Form Relatively flat unincised surface. May have ponds and discontinuous channels...

  • Ridge and swale topography

    Ridge and swale topography

    Ridge and swale topography Position: Floodplain   Form Ridges are scroll bars that have been incorporated into the floodplain....

  • Palaeochannel

    Palaeochannel

    Palaeochannel (prior channel, abandoned or ancestral channel) Position: Floodplain   Form An old, inactive channel on the floodplain. May...

  • Floodplain sand sheet

    Floodplain sand sheet

    Floodplain sand sheet Position: Floodplain   Form Flat, tabular laterally extensive sheets in non-levee settings with massive, often poorly...

  • Sand wedge

    Sand wedge

    Sand wedge Position: Floodplain   Form Sandy deposits with wedge-shaped cross-section at channel margins in non-levee settings. Typically have...

  • Backswamp

    Backswamp

    Backswamp (distal floodplain, floodplain wetland, floodpond, floodplain lake) Position: Floodplain   Form The distal floodplain, at valley margins, is...

  • Flood runner

    Flood runner

    Flood runner Position: Floodplain   Form Relatively straight depression that occasionally conveys floodwaters. Tends to have a relatively uniform...

  • Flood channel (back channel)

    Flood channel (back channel)

    Flood channel (back channel) Position: Floodplain   Form Low sinuosity subsidiary channel. Entrance height approximates bankfull stage. Commonly observed...

  • Crevasse splay (crevasse channel fill)

    Crevasse splay (crevasse channel fill)

    Crevasse splay (crevasse channel fill) Position: Floodplain   Form A sediment tongue fed by a crevasse channel that breaches the...

  • Levee

    Levee

    Levee Position: Floodplain   Form Raised elongate asymmetrical ridge that borders the channel (i.e. along the proximal floodplain). The...

  • Strath terrace

    Strath terrace

    Strath terrace Position: Floodplain   Form Typically a relatively flat, valley marginal feature that is perched above the contemporary channel...

  • Alluvial terrace (fill terrace)

    Alluvial terrace (fill terrace)

    Alluvial terrace (fill terrace) Position: Floodplain Form Typically a relatively flat (planar), valley marginal feature that is perched above...

  • Floodplain (alluvial flat)

    Floodplain (alluvial flat)

    Floodplain (alluvial flat) Position: Floodplain Form Lies adjacent to or between active or abandoned channels and the valley margin....