Table 2. Wetland Hydrology Indicators for use with Regional Supplements
|
Indicator Code
|
Indicator Name
|
Region Used In
|
No. of Supplements Indicator Occurs As
|
Primary
|
Secondary
|
Group A: Observations of Surface Water or Saturated Soils
|
A1
|
Surface Water
|
All
|
10
|
0
|
A2
|
High water table
|
All
|
10
|
0
|
A3
|
Saturation
|
All
|
10
|
0
|
Group B: Evidence of Recent Inundation
|
B1
|
Water marks
|
All
|
10
|
1-partial
|
B2
|
Sediment deposits
|
All
|
10
|
1-partial
|
B3
|
Drift deposits
|
All
|
10
|
1-partial
|
B4
|
Algal mat or crust
|
All but Arid West
|
9
|
0
|
B5
|
Iron deposits
|
All but Arid West
|
9
|
0
|
B6
|
Surface soil cracks
|
All
|
3
|
7
|
B7
|
Inundation visible on aerial imagery
|
All
|
10
|
0
|
B8
|
Sparsely vegetated concave surface
|
All but Arid West
|
4
|
5
|
B9
|
Water-stained leaves
|
All
|
8
|
2
|
B10
|
Drainage patterns
|
All
|
0
|
10
|
B11
|
Salt Crust
|
Arid West, Great Plains, Western Mountains
|
3
|
0
|
B12
|
Biotic Crust
|
Arid West
|
1
|
0
|
B13
|
Aquatic invertebrates
|
All but Alaska
|
9
|
0
|
B14
|
True aquatic plants
|
Eastern. Mountains & Piedmont, Midwest
|
2
|
0
|
B15
|
Marl deposits
|
Alaska, Atlantic Gulf Coast, Caribbean, NC-NE
|
3
|
1
|
B16
|
Moss trim lines
|
Atlantic Gulf Coast, Eastern Mountains, NC-NE
|
0
|
3
|
B17
|
Tilapia nests
|
Pacific Isles
|
1
|
0
|
Group C: Evidence of Current of Recent Soil Saturation
|
C1
|
Hydrogen sulfide odor
|
All
|
10
|
0
|
C2
|
Dry-season water table
|
All
|
2
|
8
|
C3
|
Oxidized rhizospheres along living roots
|
All
|
9
|
1
|
C4
|
Presence of reduced iron
|
All
|
9
|
1
|
C5
|
Salt deposits
|
Alaska, Pacific Islands
|
0
|
2
|
C6
|
Recent iron reduction in tilled soils
|
All but Alaska & Great Plains
|
8
|
0
|
C7
|
Thin muck surface
|
All but Alaska & Western Mountains
|
8
|
0
|
C8
|
Crayfish burrows
|
All but Alaska, Caribbean& Pac. Isles, Western. Mtns
|
0
|
6
|
C9
|
Saturation visible on aerial imagery
|
All but Alaska & Pacific Isles
|
0
|
8
|
C10
|
Fiddler crab burrows
|
Caribbean Isles & Pacific Isles
|
2
|
0
|
Group D: Evidence from Other Site Conditions or Data
|
D1
|
Stunted or stressed plants
|
All but Arid West, At. Gulf, Carib Isles, Great Plains
|
1
|
5
|
D2
|
Geomorphic position
|
All but Arid West
|
0
|
9
|
D3
|
Shallow aquitard
|
All but Great Plains & Midwest
|
0
|
8
|
D4
|
Microtopographic relief
|
Alaska, Eastern Mountains, NC-NE
|
0
|
8
|
D5
|
FAC-Neutral test
|
All
|
0
|
10
|
D6
|
Raised ant mounds
|
Western Mountains
|
0
|
1
|
D7
|
Frost-heave hummocks
|
Great Plains, Western Mountains
|
0
|
2
|
D9
|
Gauge or well data
|
Midwest
|
1
|
0
|
Hydrology Tools for Wetland Determinations
|
|
Engineering Field Handbook Chapter 19, part 650
|
All NRCS
|
