Wetland Classification and Mapping
of Seward, Alaska
Map Unit Descriptions
Map Component: RD4F1; RD4F1c
Seward Area Extent: 4 wetland polygons; 25.0 acres
The open water in the large wetland complex adjacent to Nash Road is fed by springs, and probably by both flooding and hyporheic water from the Resurrection River and Salmon Creek.
Type: Open water, a water of the US, but not a wetland.
Average depth to water table: above the surface
Average organic layer thickness: 19 cm
Average depth to redoximorphic features: 0 cm
Common Plant communities:
Water horsetail (Equisetum fluviatle)
HGM: Bidirectional, non-tidal Floodplain flat
RD4F1 wetlands support standing water in the floodplain of a glacier-fed braided stream valley. Four of these wetlands are mapped in the Seward area, two adjacent to the Resurrection River system, and two adjacent to the Snow River system. The two in the Resurrection system are fed primarily by groundwater originating on the large rock drumlin to the north. They are largely cut-off from the river by both Nash Road, and recent flooding. A Resurrection River channel is shown flowing through the wetland complex the two RD4F1 wetlands are located in, on 1:25,000 USGS topographic maps. Field visits indicate that recent deposition between the current river channel and the wetlands has resulted in some isolation. The next flood could either increase that deposit, further isolating the wetlands, or cause the channel to re-occupy its former position.
One of the two RD4F1 wetlands adjacent to the Snow River is maintained by an extensive beaver dam. The other may be partially impounded by a river access road.
RD4F1c refers to a created floodplain pond ("Roundhouse Pond' near the coal loading facility, and a small pond between the airport and the three bridges).
From The Kenai Borough website:
"The Kenai Peninsula Borough manages a Floodplain Ordinance that addresses proper development to reduce flood risks and lessen the economic losses caused by flood events. The ordinance provides building standards for construction projects within the floodplain to ensure the availability of flood insurance through the National Flood Insurance Program. These building requirements also are intended to minimize or prevent damage when flood events occur. The ordinance requires floodplain development permits for all projects in floodplains."
|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 15:24