Wetland Classification and Mapping of Seward, Alaska

 

 

Map Unit Descriptions

 

Ecosystem: Headwater Fen

 

Map Component: H1

 

Seward Area Extent: 4 wetland polygons; 3.3 acres

An H1 pond with emergent water horsetail on the glacier-cut bench above Fourth of July Creek.

 

Wetland Indicators

Type: Pond or lake

Average depth to water table: above the surface

Organic layer thickness: n/a

Average depth to redoximorphic features: n/a

Common Soils: open water

Common Plant communities:

Water horsetail (Equisetum fluviatle)

NWI: L2UB1

HGM: Terrene Basin groundwater-dominated Throughflow headwater.

H1 is the Headwater Fen Ecosystem wetland component with open surface water.  H1 also includes areas of floating and emergent vegetation.  Open water is not specifically a "wetland" as defined by Section 404 of the Clean Water Act, because it is not vegetated.  It is considered a Deep Water Habitat (if greater than 6.6 feet deep or does not support "rooted-emergent plant species") or a Vegetated Shallow (if less than 6.6 feet deep, and supports only submergent aquatic plants).  All of these habitats are regulated under section 404, as "Waters of the United States" (Environmental Laboratory, 1987). 

Headwater Fen Ecosystem wetlands are typically sloping peatland fens at or near the headwaters of first-order streams.  Seward area Headwater Fens are mapped only on the 800' elevation glacier-cut bedrock bench above Fourth of July Creek.

 


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 Introduction and Key to Plant Communities  

Introduction and Key to Ecosystems

   Seward Soils    Map Unit Summary    Methods    Glossary

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Contact: Mike Gracz
Kenai Watershed Forum 
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Old Town Professional Center
3430 Main Street Suite B1
Homer, AK  99603
907-235-2218

12 February 2007 15:16