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

Project administration
- Quarterly reports
  - Report 1, Report 2, Report 3, Report 4, Report 5, Report 6, Report 7
Quality Assurance and Project Protocol development
- Final QAPP
Instrument purchase and installation
- Instrument invoice, Instrument purchase list
- Installation confirmation photos: Evergreen station 1, Webster station 8
Instrument maintenance and data downloads
Data analysis and QAQC
- Copy of data
Final report
Communication & outreach
- Presentation
- Fact sheet

Contact information

Keunyea Song
Stormwater Action Monitoring Scientist
keunyea.song@ecy.wa.gov
360-407-6158

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