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Developmental Factors of Isolated Wetlands

Explore the geological and hydrological factors influencing the development of isolated wetlands, including glacial and aeolian wetlands. Learn about the SWANCC v. US Army Corps of Engineers ruling and the new definition of isolated wetlands.

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Developmental Factors of Isolated Wetlands

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  1. Isolated Wetlands Hydro-geo Developmental Factors of Isolated Wetlands

  2. Developmental Factors • SWANCC v. US Army Corps of Engineers • Geological Factors • Hydrological Factors • Isolated wetlands?

  3. 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?

  4. 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

  5. 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

  6. 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

  7. Other Geological Factors • Great Lake Alvar Wetlands • Shallow bedrock • Topographical Depressions • salt flats, costal plains and pocosins • Perched clay layers • Build up of fines

  8. Hydrological Development of Wetlands • Karst Basin • Calcium and Dolomite in soil carried away by GW • Cypress Domes • Sinkhole wetlands

  9. 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.

  10. Isolated Wetlands? • Defining “isolated” • Looking at spatial and temporal relations

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