6.1.3 Model at a Glance

Depressional Outflow Wetland - Function: Removing Sediment

Process

Variables

Measures or Indicators

Velocity reduction

V storage

Average depth of both live and dead storage

Velocity reduction

V out

Qualitative descriptors of outlet constriction

Velocity reduction

V effectarea1

% of AU seasonally inundated

Filtration

V vegclass

% of AU in different Cowardin vegetation classes

Filtration

V understory

% area if herbaceous understory in AU

 

Vstorage + Vout + Veffectarea1 + Vvegclass + Vunderstory

Index: ________________________________________________

Score from reference standard site

 

 

 

Depressional Outflow Wetland - Function: Removing Nutrients

Process

Variables

Measures or Indicators

Phosphorus removal

S sed

Index for Removing Sediments

Phosphorus removal

V sorp

% of AU with clay soil; % of AU with organic soil

Nitrogen transformation

V effectarea2

Area of seasonal inundation minus area of permanent open water

Nitrogen transformation

V out

Qualitative description of outlet characteristics

 

 

S sed + Vsorp + Veffectarea2 + Vout

Index: ______________________________

Score from reference standard site

 


Depressional Outflow Wetlands - Function: Potential for Primary Production

and Organic Export

Process

Variables

Measures or Indicators

Primary Production

V vegcover

% of AU with vegetation cover

Primary Production

V non-evergreen

% area of all non-evergreen vegetation

Primary Production

V understory

% area of herbaceous understory in AU

Export

V org

Extent of organic soils in AU

Export

V effectarea1

% of AU that is seasonally inundated

Reducers:

Bogs

V bogs

% of AU covered by a sphagnum bog

 

Index:

(Vvegcover + Vnon-evergreen + Vunderstory) x ( Vorg + Veffectarea1) x Vbogs

_________________________________________________________________

Score from reference standard site

 

Depressional Outflow Wetlands - Function: Habitat Suitability for Amphibians

Process

Variables

Measures or Indicators

Breeding, feeding and refuge for amphibians

V buffcond

Descriptive table of conditions in buffer
 

V substrate

Types of surface substrates present
 

V wintersp

Diagrams
 

V lwd

Categories of LWD present
 

V water

% of AU with permanent water, or permanent water under FO or SS
 

V substruc

Categorization by dichotomous key

Reducers:

 

V phow

pH tabs, direct measurement
 

V upcover

Land uses within 1 km of wetland

Index:

(Vbuffcond + Vsubstrate + Vwintersp + Vlwd + Vwater + Vsubstruc) x

(Vphow or Vupcover)

_______________________________________________________________

Score from reference standard site

 

 

D- (Data) Values for calculating Variables, "Removing Sediment" Function

V storage

D10: Usual (annual) height of flooding above the lowest point of outflow (estimating live-storage).

D11: Cross section of live-storage

D8: Area of inundation

 

V out

D13: Constriction of outlet

 

V effectarea1

D8: Area of inundation

 

V understory

D16: Percent of forest or scrub/shrub areas with an herbaceous understory

D14: Percent of AU with different Cowardin vegetation classes

 

V vegclass

D14: Percent of AU with different Cowardin vegetation classes