How was value determined:

1. The range of values for regional wetlands erosion control was transferred from one peer-reviewed study of vegetated buffers in Monterry Bay, California (Rein 1999).
2. The data from this study were adjusted to the West Michigan policy region.

Value estimate limitations:

1. The values represent the role of riparian buffers and wetlands for streambank stabilization and protection from erosion.
2. There are several studies that measure the value of wetlands for erosion control through water quality improvements, which integrate several economic values. To single out the value of only wetlands for erosion control from these studies is difficult.