Results
For a variety of reasons, more even flows were put into place while the final environmental impact studies were being prepared, and Congress formalized these flows when it passed the Grand Canyon Protection Act of 1992. Whatever the effects of the contingent valuation study on that decision, the study did represent one of the first federally-funded projects to estimate non-use values. It was also one of the first contingent valuation studies included as part of a federally funded economic analysis.