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The National Academies

NCHRP 25-25/Task 35 [Completed]

Water Quality Analyses for NEPA Documents: Selecting Appropriate Methodologies
[ NCHRP 25-25 (Research for the AASHTO Standing Committee on the Environment) ]

  Project Data
Funds: $79,972
Research Agency: Parsons Brinckerhoff Quade & Douglas
Principal Investigator: Chin Y. Lein
Effective Date: 11/9/2006
Completion Date: 6/30/2008
Comments: Completed

NEPA requires that sponsors of transportation projects consider the impacts of those projects on water quality and water resources. There are numerous methodologies available to perform these analyses; however, there is little or no guidance on the appropriate method for a NEPA analysis versus other purposes. This study reviewed currently available water quality models / methodologies used for analyzing potential impacts of transportation projects, provided a description and assessment of each model/method and a determination of whether the model/method is out-dated or valid. When valid, the study identified the type of project or level of analysis the model/method is best suited to as well as any limitations to the model's use.
The project has been completed and the final report can be downloaded here.   

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