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              Impact Evaluation Report, EarthCorps Restoration Methods
      Back
                EarthCorps is a Seattle-based non-profit organization that trains young adults in environmental restoration techniques along shorelines, forests, and trails in the Puget Sound area. Over the course of a year-long training program, volunteers (including AmeriCorps members) learn practical skills that can be used to combat global warming, pollution, and environmental degradation.

**Study Goals**:

The goal of this study was to assess the effectiveness of EarthCorps restoration methods. The evaluated intervention focused on green infrastructure development needed to decrease pollution in Puget Sound watersheds around Seattle. Intervention activities included restoration work at select sites around the region, as well as installation and maintenance of engineered green storm water infrastructure and community education efforts.

**Research Questions**:

The primary research question was:

Does the restoration action done by EarthCorps achieve the outcome of making natural areas healthier?Additional site-specific questions were:

What was the percentage of invasive cover on the site before the initial intervention? (baseline data from 2018)?
	What was the percentage of invasive cover after the intervention? (intermediate-term indicator, after one growing season)?**Findings:**

The evaluation found the following:

Results indicated that the plots treated with restoration efforts exhibited statistically significant pre-post reductions in invasive species cover after treatment (p < 0.05).
	There was no significant change in the comparison sites. It was estimated that the invasive cover in the treatment plots decreased from 93.2% to 16.3% within 12 months after treatment.For more information, download the full report.

      Full report
      

      Full Report
            EarthCorps Impact Evaluation Report
        Further information
    



      Program/Intervention
                        EarthCorps Corps Program
  

      Implementing Organization
                        EarthCorps
  

      Intermediary(s)
                        EarthCorps
  

      AmeriCorps Program(s)
            AmeriCorps State and National
  

      Age(s) Studied
            18-25 (Young adult)
  

      Focus Population(s)/Community(s)
            Rural
                  Suburban
                  Urban
                  Low-income
  

      Outcome Category
            At-risk ecosystems
  

      Study Type(s)
            Impact
  

      Study Design(s)
            Quasi-experimental (QED)
  

      Level of Evidence
            Moderate
  

      Researcher/Evaluator
                        The Watershed Company
  

      Published Year
                        2019
  

      Study Site Location (City/County)
            Seattle
                  Fife
                  Bellevue
                  Normandy Park
  

      Study Site Location (State)
            Washington Back to main content Sign up to hear about our latest news, events, and opportunities.
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