Any plan advanced by the U.S Army Corps of Engineers or others to re-reverse the flow of the Chicago canal system will hasten the demise of Lake Michigan (ENR 5/21 p. 19). The Chicago River keeps 99.5% of the metropolitan area's stormwater and wastewater from discharging to the lake, arresting its rate of decline. Cities and watersheds in Indiana, Michigan and Wisconsin continue to discharge copious quantities of water containing non-regulated chemicals. Meanwhile, Asian carp have shown no inclination to move into the canal system due to its desolate habitat and absence of food for these voracious eaters. The Corps needs to be mindful of the impact on Lake Michigan.
Because it can moderate the damaging effects of earthquakes, base-isolation is a technique used primarily in seismically active regions. ENR takes a look at some of the largest applications of base-isolation technologies in the world.