Other Main Variables
University of Maryland
PLM Ecological Component	human activ. (BMPs); terr. consumers
Economic Component	human activities
River Estuary Ecosystem
River Box Model	salt
US EPA Chesapeake Bay Program
Airshed (RADM)
Watershed (HSPF)
Land Use (AGCHEM)
River Model
Hydraulic Model
Estuary
3-D Hydrodynamic	"flow rates into Bay, tides, currents"
Water Quality
SAV and Living Resources
COmplexity And STressors in Estuarine Systems (COASTES)
Watershed Model
River Water Quality
Integrative Ecological Models	"prodn, species comp, C cycling"
Individual-Based Fish Models	"bioenergetics, predatn, recruitment"
Smithsonian Environmental Research Center
Suite of Models	land use structure
Maryland Office of Planning
Watershed Planning System	"human activities, BMPs, "
Maryland Department of the Environment
Watershed (HSPF)
Estuarine Model (WASP)
Cost-Effectiveness (CPLEX)	BMPs
Hydrodynamic