Wetland Classification and Mapping of Seward, Alaska

 

 

Map Unit Descriptions

 

Ecosystem: Kettle

 

Map Units: K21; K12

 

Seward Area Extent: 

K21: 3 wetland polygons; 3.3 acres

K12: 1 wetland polygon; 1.1 acre

The K21 portion of a K1-3 peatland near the Snow River.  The pools in the center of the photo with emergent buckbean represent the K1 component, and the surrounding tufted bulrush represents the K2 component.  The shrubby area in the foreground is K3.

 

Wetland Indicators

Type: Peatland with small pond

Average depth to water table: 10 cm

Organic layer thickness: 139 cm

Average depth to redoximorphic features: n/a

Common Soils: Typic Cryosaprists, Typic Cryohemists, Hydric Cryofibrists

Common Plant communities:

Fewflower sedge - tall cottongrass (Carex pauciflora - Eriophorum angustifolium)

Tufted bulrush - tall cottongrass (Tricophorum caespitosum - Eriophorum angustifolium)

NWI: L1UB1 or PEM2H if shallow (K1); PEM1Bg (K2)

HGM: Terrene Basin groundwater-dominated Throughflow (headwater)

These uncommon wetlands are small ponds (K1) with a sedge-dominated peatland fringe (K2).  If the open water portion of the wetland is dominant it is named K12, and if a broad peatland fringe surrounds a small pond it is named K21.  They are found in low spots on ice-scoured bedrock.  None of the four wetlands mapped as either K21 or K12 were visited in the field.

Kettle Ecosystem wetlands are hydrologically connected at or near the surface to streams and eventually Resurrection Bay.  Seward area Kettles are primarily encountered on the large rock drumlin northeast of town.  They also occur in low spots on other ice-scoured bedrock knobs, especially above the South Fork of the Snow River.

 


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

12 February 2007 15:21