What are the benefits of trees in watersheds? How can this be quantified? This link will take you to the Treekeepers' website with specific information on the benefits of trees.
What are the benefits of wetlands? Click this link to learn what benefits wetlands provide.
About 35% of the Tualatin basin is made up of agricultural land. The management of agricultural runoff and waste is important to keeping the waters clean. See this link for management suggestions on mud, manure, and pastures.