EXAMPLES OF MODELS

I. Removing Sediment, Depressional Flow-Through Wetlands

Effectiveness:

V groundveg: % cover vegetation at ground level, <2m high

V out: amount of outlet constriction

V water depth: WET water depth classes

V effect area 1: area where water will occur

Opportunity:

V upsedim: conditions upbasin which contribute sediment (ag, logging)

II. Removing Nutrients, Same for all four subclasses

Effectiveness:

S sed: Score from "Removing Sediment" model

V sorp Amount clay or OM in soil

V dairy Dairy upstream which saturates P retaining capacity

V effect area 2 Seasonally inundated area minus area permanently inundated

Opportunity:

V upnut Upbasin conditions which add nutrients to surface or groundwater

V domwater Dominant source of water (phosphorus comes from groundwater)

V gwplevels Level of P present in groundwater entering wetland

III. Maintaining Seasonal Low Flows, Depressional Flow-Through and Depressional Closed

Effectiveness:

V subconnect Presence of an underground hydrologic connection to an adjacent stream or river

V effect area 2 The area of the wetland where effective filtration occurs (% of wetland)

V livestorage The amount of live storage in wetland during flood

Opportunity:

N/A All waters in W. Washington are discharged into streams rather than deep unconfined aquifers, therefore any water reaching a wetland has potential to provide seasonal low flows

IV. Primary Production and Export, Riverine Flow-Through Wetlands

Effectiveness:

V vegcover Primary production proportional to veg cover (% cover)

V herbcover Primary production export aided by fast decomposition which is proportional to herb cover (% cover)

V decwoody Primary production export augmented by readily decomposed deciduous trees (% cover)

V upnut Upstream nutrients

V outflow Wetland has a perennial or seasonal outflow through a defined channel

V freq Flooding frequency determines export frequency

V substrate Surface layer: presence of O.M. means no export, score (0); absence means export, score (1).

Opportunity:

N/A Any vegetated wetland has opportunity to produce plant material