Wetland Classification and Mapping
of Seward, Alaska
Map Unit Descriptions
Ecosystem: Headwater Fen
Map Units: H23; H32
Seward Area Extent:
H23: 4 wetland polygons; 16.3 acres
H32: 3 wetland polygons; 7.3 acres
The H2 portion of an H23 fen on the glacier-cut bedrock bench above Fourth of July Creek. Tufted bulrush and tall cottongrass, both good indicators of a near-surface water table, occupy most of the foreground in the photo. Small H3 areas can be seen as lighter colored hummocks in the distance, and center left.
Average depth to water table: 10 cm
Organic layer thickness: 146 cm
Average depth to redoximorphic features: n/a
Common Plant communities:
Sphagnum - Tall cottongrass (Eriophorum angustifolium)
Fewflower sedge (Carex pauciflora)
Fewflower sedge - tufted bulrush (Carex pauciflora - Tricophorum caespitosum)
NWI: PEM1Bg (H2); PSS1,3&4Eg (H3)
HGM: Terrene Basin groundwater-dominated Throughflow headwater.
H32 and H23 wetlands are combinations of low-lying spots where the water table is at of near the surface, and fewflower sedge fens, where the water table is deeper. If low-lying areas predominate the fen is named H23, and if fewflower sedge is dominant it is named H32.
Headwater Fen Ecosystem wetlands are 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.
|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 15:17