The classification system of Cowardin et al. Each wetland is classified with the Cowardin et al.
Wetlands are dynamic.
Amount of water changes within and among years according to precipitation, climate, etc. Vegetation also changes within and among years. Monetary and logistic considerations may limit the functions that can be restored. Regulatory projects, such as mitigation wetlands, may have goals or functions specified. Performance standards, monitoring, and evaluation are important.