Water budgets of individual local trees

Washington Department of Natural Resources (DNR) is collaborating with Washington State University, City of Tacoma, The Evergreen State College, and Clemson University on a project to measure the effectiveness of local trees to mitigate stormwater runoff in western Washington. Twenty-one trees will be fitted with sensors to measure how much water a tree uses, also called its water budget.


Study objectives

The study will answer how much rainfall is managed by an individual tree. It will:

  • Quantify annual transpiration rates and annual canopy interception rates for evergreen and deciduous trees native to the Pacific Northwest.
  • Complete water budget and estimate hydrologic value of existing trees.

Project tasks and key deliverables

Contract IAA & Scope of Work

  1. Project administration
  2. Quality Assurance and Project Protocol development
  3. Instrument purchase and installation
  4. Instrument maintenance and data downloads
  5. Data analysis and QAQC
    • Copy of data
  6. Final report
  7. Communication & outreach
    • Presentation
    • Fact sheet