Oct 20:  A new report by the Natural Resources Defense Council (NRDC) calls for building  two strategically-placed barriers between the Great Lakes and Chicago River  which they say could open the door to a revitalized waterway and surrounding  communities,  while effectively shutting the door on Asian carp. The report  investigates a variety of hydrological separation scenarios in order to  determine the best way to fix both the Asian Carp crisis and the litany of  issues associated with Chicago's aging water infrastructure through one smart  solution. The 70+ page technical document has been summarized into a six-page briefing.  
     NRDC Midwest  Program Director Henry Henderson, who also served as the City of Chicago's first  Commissioner of the Environment said, "The Carp crisis illuminates how  unacceptable conditions are on the Chicago River. It is clear that the  public is ready to re-imagine the waterway rather than accept an aging invasive  species superhighway and open sewer status quo. We believe this report moves  that process forward."
     The report,  Re-Envisioning the Chicago River: Adopting Comprehensive Regional Solutions  to the Invasive Species Crisis, studies the impact a separation would have  in the complicated Chicago Area Waterway System (CAWS). It builds upon  previous studies of potential separation sites in the CAWS and draws from a  variety of city, state and federal data sources. The study was prepared with  engineers from Shaw Environmental in partnership with NRDC with input from City,  State, and Federal agency stakeholders. It is presented as the first big step in  an iterative process to find a solution to the invasive species and Chicago  River issues and is meant to inform the broader public discourse.
     In analyzing the  local hydrology, the Shaw engineers determined that any rainfall over 0.67  inches would cause flooding and water quality problems due to infrastructure  limitations. Shaw then evaluated possible separation sites based on their  potential to rebuff invasive species as well as minimize storm impacts, focus  investment in water quality improvements, leave recreational boat traffic  largely unaffected, and spur the use of green infrastructure to help address the  sewer capacity issues while bringing significant aesthetic and functional  benefits to neighborhoods. Shaw's green infrastructure modeling showed that  planting trees, bioswales and installing rain gardens or rain barrels could lead  to substantial reduction in stormwater loads to the CAWS. 
     The report  recommends barriers be placed at the Racine Pumping station on Bubbly Creek near  the Bridgeport neighborhood and at the Calumet Wastewater Treatment Facility on  the Cal-Sag Channel on the City's far southeast side. The report notes that separation would likely spur other positive  outcomes, including fewer flooded basements and a cleaner river. NRDC believes  it would also spur significant infrastructure investment. Coincidentally, this  week, the Illinois Pollution Control Board is holding the final hearings in  their historically-long proceedings on the decontamination of the Chicago River  which could also force significant changes to the way the wastewater that makes  up most of the river's flow is managed.
     One significant concern raised in the report is the potential  impact that the barrier placement could have on navigation. Recreational boats  will be largely unaffected by the barrier locations. Subsequent studies will  have to look more closely at the movement of goods on the CAWS as the barrier in  the Cal-Sag channel could limit some barge traffic. However, the report notes  that this could lead to the development of a new intermodal facility that would  better tie the waterways to the region's rich transportation infrastructure.  Only 1% of goods moving through the Chicago area move through the CAWS. Better  integration with roads and rails could actually spur commerce on the  river.
     In a related  matter, the Indiana Department of Natural Resources (IDNR) issued a release  regarding the construction of a 1,177-foot main fence and a supplemental  494-foot debris catch fence that began in early September and was completed on  Tuesday (October 19). The IDNR took a lead role in the fence project after  identifying Eagle Marsh as a potential pathway for Asian carp to move from the  Wabash River system into the Maumee River, a tributary to Lake Erie. Although  the Wabash and Maumee basins drain in opposite directions and have no direct  connection under normal conditions, their waters do comingle under certain flood  conditions in Eagle Marsh, a 705-acre restored wetland near Fort  Wayne.