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WETLAND MITIGATION: AN EARLY EFFORT.
| 题名： | WETLAND MITIGATION: AN EARLY EFFORT. |
| 作者： | Nash-CM; Cotten-M |
| 关键词： | ILLINOIS-; TOLL-ROADS; HIGHWAY-CONSTRUCTION; WETLANDS-; WETLAND-CONSERVATION; MITIGATION-MEASURES; RIVERS-; VEGETATION-; PLANTING-; SITES-; PERFORMANCE-STANDARDS |
| 摘要： | In 1986, the Illinois State Toll Highway Authority began construction of the 28-km North-South Tollway (Interstate 355) in the western suburbs of Chicago, Illinois. Construction of this roadway filled slightly more than 30 ha of wetlands, and Section 404 of the Clean Water Act required compensatory replacement or mitigation. A Wetland Working Group was formed to develop the wetland design criteria needed for this mitigation effort. The project resulted in the creation or enhancement of about 51 ha of wetlands along the East Branch of the DuPage River and is now a model for similar wetland mitigation in the Midwest. The effort encountered numerous problems in the early years of development. Most problems were directly related to regional issues and the urban setting in which these mitigation wetlands were located: factors beyond the control of the design team. Additional plantings, once actual water levels were determined, increased species richness and vegetative abundance in those sites that experienced less success originally. Ultimately, however, those working on the project had to change the performance requirements to more closely agree with what can actually be achieved by such sites. Some of the sites performed better than expected, and all of the wetlands are performing according to the revised standards. |
| 总页数： | Public Roads. 1997/11. 61(3) pp51-54 (5 Phot.) |
| 报告类型： | 科技报告 |
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