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Wetland Classification and Mapping
of the Kenai Lowland, Alaska
Map Unit Descriptions
Ecosystem: Depression Map Component: D3; D3d
Extent: D3: 429 wetland polygons; 488.2 ha; 0.34% of wetland area; 2.60% of wetland polygons. D3d: 1 wetland polygon; 0.3 ha; 0.00% of wetland area; 0.01% of wetland polygons. |
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 A D3 depression near Circle Lake, 20 miles NE of Homer (polygon 10334). |
Wetland Indicators Type: Mineral (then often dominated by bluejoint grass) or Peat Average depth to water table: 15 cm; n=1 Organic layer thickness:121 cm; n=3 Average depth to redoximorphic features: n/a Common Soils: DOROSHIN, SALAMATOF Common Plant communities:
NWI: PSS1,3&4B HGM: Terrene Basin Isolated |
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Accuracy assessment: 50 polygons interpreted as D3 on aerial photographs were field checked. 24 remained D3. 4 each were revised to D23, D34, D4 and upland. 3 each were revised to D32 and D2. 1 each was revised to K23 and SS. 2 were revised to K3. |
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D3 is the most common and widespread depression map component, both as a monotypic wetland and in complex with other components, especially D2 and D4. D3 is a Depression Ecosystem component with a deeper water table (below the surface, but still meeting the 1987 Army Corps criteria for a wetland), often dominated by shrubs. It is found over the entire lowland project area. Bluejoint grass (Calamagrostis canadensis) and thick sphagnum moss also indicate D3. D3 is commonly part of a complex between the forested margins of a depression, and the wetter sedge dominated center.
In Homer, a single wetland has been
mapped as D3d. It is a
wetland that was D3, but is now disturbed.
