Mitigation of Ecological Impacts. A Syntheis of Highway Practice. National Cooperative Highway Research Program (NCHRP) Synthesis 302

摘要

Compliance with federal, state, and tribal regulations is the driving force behind the development and implementation of ecological mitigation projects by state department of transportation (DOTs). An objective of this study is to document the current practices of transportation agencies in implementing ecological mitigation measures for highway projects as they apply to aquatic, wetland, and riparian habitats. This synthesis summarizes available information on the types of ecological impacts incurred by highway projects and the methodologies used to assess these impacts, procedures for determining the need for mitigation and monitoring, types of mitigation implemented for different impacts and how mitigated sites are monitored, methodologies for the evaluation of mitigation success or failure, and the costs of mitigation.