Water budgets of individual local trees

Study objectives

This study is desgned to 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. 

The Phase I study quantified hydrological benefits of mature trees, and the Phase II study will collect data on younger and smaller trees, like those common in more urban areas. 

Project tasks and key contract deliverables

Phase I (mature forest trees)

Contract and scope of work

1. Project administration
   • Quarterly reports
     • Report 1, Report 2, Report 3, Report 4, Report 5, Report 6, Report 7, Report 8 (Preliminary result included), Report 9, Report 10, Report 11, Report 12 
2. Quality assurance project plan development
   • Final QAPP
3. Instrument purchase and installation
   • Instrument invoice, purchase list
   • Installation confirmation photos: Evergreen station 1, Webster station 8
4. Instrument maintenance and data downloads
5. Data analysis and QAQC
   • Copy of data: contact SAM staff 
6. Final report on mature trees and stormwater mitigation
7. Communication & outreach
   • Presentation: Preliminary results (September 2021)
   • SAM fact sheet #26 Measuring individual tree water-use in mature native species in the Pacific Northwest to determine their benefits for stormwater

Phase II (younger, smaller trees)

Contract and scope of work, Amendment 1

1. Project Administration 
   • Biannual report 1, report 2, report 3 
2. QAPP amendment 
3. Instrument installation and monitoring 
4. Instrument maintenance and downloads - see biannual reports above
5. Data analysis and submittal 
   • Copy of data 
6. Final Phase II report 
7. Communication and outreach
   • Presentation
   • Fact sheet