HYDRIC SOILS OF THE KENAI LOWLANDS

From the NRCS Alaska hydric soils list (119k .pdf file)

See definitions and notes below.

SERIES 

SUBGROUP

 TEMP.

DRAINAGE CLASS

HIGH WATER TABLE

 PERMEABILITY. W/IN 20"

(inches/hour)

FLOODING

 HYDRIC CRITERIA NUMBER

CAPABILITY

DEPTH

(Feet)

MONTHS

 FREQUENCY DURATION MONTHS CRITICAL PHASE CRITERIA CLASS & SUBCLASS
ANCHOR POINT TYPIC CRYAQUENT CRYIC P 1.0-2.0 APR-SEPT <6.0 FREQUENT BRIEF APR-SEPT

2B3

 ALL 5W
*BELUGA TYPIC CRYAQUENT CRYIC P 0.5-2.0 JAN-DEC <6.0 NONE     2B3 0-7% 5W
0-3% DRAINED 3C
3-7% DRAINED 3E
0-7% WET 5W
CHUNILNA TYPIC CRYAQUAND CRYIC VP , P 0-1.5 APR-NOV <6.0 NONE     2B3 0-25% 6W
CLAM GULCH HUMIC CRYAQUEPT CRYIC P 0-1.0 APR-NOV <6.0 NONE     2B3 0-7% 5W
12-30% 6W
CLUNIE TERRIC BOROFIBRIST FRIGID VP +1 -1.0 JAN-DEC >-6.0 COMMON BRIEF JAN-DEC 1,3   7W
COAL CREEK HUMIC CRYAQUEPT CRYIC P 0.5-2.0 JAN-DEC <6.0 NONE-RARE     2B3 0-7% WET 5W
7-12% WET 6W
12-20% WET 6W
0-7% DRAINED 3C
7-12% DRAINED 3E
12-20% DRAINED 4E
COAL CREEK, FLOODED HUMIC CRYAQUEPT CRYIC VP 0.5-2.0 JAN-DEC <6.0 OCCASIONAL BRIEF APR-AUG 2B3 0-3% 5W
3-7% 5W
DOROSHIN TERRIC BOROHEMIST FRIGID VP 0-1.0 JAN-DEC >=6.0 NONE     1 ALL 7W
FORELAND HISTIC CRYAQUEPT CRYIC VP 0-1.0 MAY-OCT <6.0 NONE     2B3 ALL 7W
JACOBSEN HISTIC CRYAQUEPT CRYIC VP 0-1.0 MAY-AUG <6.0 NONE-RARE     2B3 ALL 7W
KALIFONSKY TYPIC CRYAQUEPT CRYIC VP 0-1.0 JAN-DEC <6.0 NONE-RARE     2B3 ALL 5W
*KILLEY TYPIC CRYAQUENT CRYIC VP 0-1.5 APR-OCT <6.0 COMMON BRIEF APR-AUG 2B3 0-4% 5W
*KILLEY, SANDY TYPIC CRYAQUENT CRYIC VP, P 1.0-2.0 APR-OCT <6.0 COMMON BRIEF APR-AUG 2B3 ALL 5W5W
*MOOSE RIVER TYPIC CRYAQUENT CRYIC VP, P 0-1.5 APR-OCT <6.0 COMMON BRIEF APR-OCT 2B3 0-3%  
NIKOLAI TERRIC BOROSAPRIST FRIGID P 1.0-2.0 APR-OCT <6.0 NONE     1 ALL 7W
NIKOLAI, LOAMY TERRIC BOROSAPRIST FRIGID VP 0.5-2.0 APR-OCT <6.0 NONE     1 0-3% WET 7W
0-3% DRAINED 3C
SALAMATOF SPHAGNIC BOROFIBRIST FRIGID VP +1-0.5 JAN-DEC >=6.0 NONE     1,3 ALL  
SLIKOK HISTIC CRYAQUEPT CRYIC VP +1-1.0 APR-OCT <6.0 COMMON BRIEF APR-AUG 2B3,3 ALL 5W
SLIKOK, NON-FLOODED HISTIC CRYAQUEPT CRYIC VP +1-1.0 JAN-DEC <6.0 NONE     2B3,3 ALL 5W
SLIKOK, SANDY SUBSTRATUM HISTIC CRYAQUEPT CRYIC VP +1-1.0 APR-OCT <6.0 FREQUENT BRIEF APR-AUG 2B3,3 ALL 6W
*SNOWDANCE TYPIC CRYAQUAND CRYIC P, VP 0-1.5 APR-NOV <6.0 NONE     2B3 0-7% 5W
7-12% 6W
12-25% 7W
SPENARD ANDIC CRYAQUOD CRYIC VP 0-2.0 JAN-DEC <6.0 NONE     2B3 WET 6W
3-7% DRAINED 3E
7-12% DRAINED 4E
SPENARD, GRAVELLY SUBSTRATUM ANDIC CRYAQUOD CRYIC P 1.0-2.0 APR-OCT <6.0 NONE     2B3 0-3% 5W
3-12% 6W
STARICHKOF FLUVAQUENTIC BOROHEMIST FRIGID VP +1-0.5 JAN-DEC >=6.0 NONE     1,2B2,3 ALL 7W
TORPEDO LAKE HISTIC CRYAQUEPT CRYIC VP 0-1.0 JAN-DEC <6.0 NONE     2B3 ALL 6W
TYONEK FLUVAQUENTIC BOROSAPRIST FRIGID VP 0.0.5 JAN-DEC <6.0 NONE     1,2B3 ALL 7W

*SOME SOIL INTERPRETATION RECORDS REPRESENTING PHASES OF THIS SERIES ARE NOT HYDRIC

CRITERIA FOR HYDRIC SOILS

  1. All Histels except Folistels and Histosols except Folists, or
  2. Soils in Aquic suborders, great groups, or subgroups, Albolls suborder, Historthels great group, Histoturbels great group, Pachic subgroups, or Cumulic subgroups that are:
    3. a. Somewhat poorly drained with a water table* equal to 0.0 foot (ft) from the surface during the growing season, or
    b. poorly drained or very poorly drained and have either:
    (1) water table* equal to 0.0 ft during the growing season if textures are coarse sand, sand, or fine sand in all layers within 20 inches (in),
     
    or for other soils
     
    (2) water table* at less than or equal to 0.5 ft from the surface during the growing season if permeability is equal to or greater than 6.0 in/hour (h) in all layers within 20 in, or

     

    (3) water table* at less than or equal to 1.0 ft from the surface during the growing season if permeability is less than 6.0 in/h in any layer within 20 in, or
     
  3. Soils that are frequently ponded for long duration or very long duration during the growing season, or
  4. Soils that are frequently flooded for long duration or very long duration during the growing season.

 

Land Capability Classes and Subclasses
(from Agriculture Handbook 210)

Capability Class Limitations Possible Land Use Possible Corrections Possible Capability Subclasses
1 No limitations for cropland Very intense cultivation of field crops Fertilization to maintain productivity None
2 Moderate limitations for cropland Intense cultivation of field crops Drainage, fertilization, conservation e, w, s, c
3 Severe limitation for cropland Moderate cultivation of field crops Drainage, fertilization, conservation e, w, s, c
4 Very severe limitations for cropland Limited cultivation of field crops  Drainage, fertilization, conservation e, w, s, c
5 Slight to moderate limitations for grassland Intense grazing Not feasible w
6 Severe limitations for grassland Moderate grazing No e, w, s, c
7 Very severe limitations for grasslands Limited grazing No e, w, s
8 Non-agricultural land (ie. badlands, mine tailings) Wildlife, recreation No None

Capability subclasses are designated with lower-case letters:

e = erosion: soils susceptible to erosion 

w = water: poor soil drainage, wetness, high water table or overflow 

s = soil limitations: shallow or stony rooting zone, low water holding capability, low fertility, salinity, sodium 

c = climatic limiations: cool temperatures or lack of moisture

links:

Introduction to Hydric Soils of the US

Field Indicators

Hydric soil Technical Notes

Draft Alaska Hydric Field Indicators (The Army Corps of Engineers is in the process of regionalizing the 1987 Delineation Manual, when that is complete, these indicators will be incorporated into the Alaska Manual)

 Introduction and Key to Plant Communities  

Introduction and Key to Ecosystems

    Kenai Hydric Soils    Map Unit Summary    Methods
Contact: Mike Gracz
Kenai Watershed Forum 
Homer Field Office
Old Town Professional Center
3430 Main Street Suite B1
Homer, AK  99603
907-235-2218
The Alaska Natural Heritage Program
Environment and Natural Resource Institute
University of Alaska, Anchorage
707 A Street, Suite 101
Anchorage, Alaska  99501

03 February 2005 09:49