Channelization of Streams and Rivers in Illinois: Procedural Review and Selected Case Studies. Appendices

摘要

These are appendices for the report 'Channelization of Streams and Rivers in Illinois: Procedural Review and Selected Case Studies.' The report is an effort to understand the practice, impact, and implications of activities related to channelization of watercourses in the State of Illinois, and, thus, to provide a guide for future efforts in the state. According to records in the Illinois Stream Information System database, nearly 25% of surface water resources in Illinois have been modified directly by channelization and levee construction. These alterations have occurred for the most part without the benefit of mitigation. Loss of stream and riparian habitat poses a threat to environmental systems, not only in Illinois, but nationwide as well. The project defines the extent of channelization and levee construction in the state, delineates the permitting process as it pertains to channelization activities, develops case studies for events associated with specific projects representative of the range of activities involving channelization, and provides an overview of channelization work with implications for mitigation of environmental impacts.