Water budgets of individual local trees

Washington Department of Natural Resources (DNR) will lead the project on the effectiveness of keeping local trees to mitigate stormwater runoff in Western Washington. A total of 21 trees will be fitted with sensors to measure how much water a tree uses, also called its water budget.   

DNR will collaborate with several groups to accomplish this study: Washington State University, City of Tacoma, The Evergreen State College, and Clemson University.

Study objectives

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

  • 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

Project researchers have set up a website to visualize the raw data.

  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
    • Factsheet