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Isolated Wetlands. Hydro-geo Developmental Factors of Isolated Wetlands. Developmental Factors. SWANCC v. US Army Corps of Engineers Geological Factors Hydrological Factors Isolated wetlands?. SWANCC v. US Army Corps of Engineers.

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isolated wetlands

Isolated Wetlands

Hydro-geo Developmental Factors of Isolated Wetlands

developmental factors
Developmental Factors
  • SWANCC v. US Army Corps of Engineers
  • Geological Factors
  • Hydrological Factors
  • Isolated wetlands?
swancc v us army corps of engineers
SWANCC v. US Army Corps of Engineers
  • Ruling made regulation of many isolated wetlands out of jurisdiction of the USACE
  • New definition of isolated wetland’s relevance needed
  • So why do I have to listen to you talk about water and rocks?
geological development of wetlands
Geological Development of Wetlands
  • Glacial wetlands
    • 10,000+ years ago N. Am covered in glaciers
  • Aeolian Wetlands
    • Scouring of wind over time
  • Other geological factors
    • Range from topographical depressions to make-up of the soil strata
glacial wetlands
Glacial Wetlands
  • Prairie Potholes
    • 10,000 yrs ago Wisconsin Glacier retreated
    • Stretch from North Dakota to Montana then south into Texas
  • Channeled Scablands
    • Collapse of glacial ice dams
    • Mainly in Cascade Mountain Region of Pacific NW
    • ~85% are considered isolated
aeolian wetlands
Aeolian Wetlands
  • Nebraska Sandhills
    • 60% isolated (317,400 ha of a total 529,000 ha)
  • Playas
    • cover the Southern High Plains between Texas and New Mexico
    • Aeolian forces scouring out shallow, circular, flat bottomed basins
    • calcium in the soil is dissolved by water collection
  • Rainwater Basin
    • cover the Southern High Plains between Texas and New Mexico
    • 90% of them geographically isolated
    • silty loess plains
other geological factors
Other Geological Factors
  • Great Lake Alvar Wetlands
    • Shallow bedrock
  • Topographical Depressions
    • salt flats, costal plains and pocosins
    • Perched clay layers
      • Build up of fines
hydrological development of wetlands
Hydrological Development of Wetlands
  • Karst Basin
    • Calcium and Dolomite in soil carried away by GW
  • Cypress Domes
  • Sinkhole wetlands
karst basin wetlands
Karst Basin Wetlands
  • Cypress Domes
    • Swampy Woodlands (cypress, duh…)
    • Sustained by precipitation run off and long retention times
  • Sinkhole Wetlands
    • Intricate system of underground fissures and streams.
isolated wetlands10
Isolated Wetlands?
  • Defining “isolated”
  • Looking at spatial and temporal relations