It’s been a gloomy rainy sort of day here in Chicago. The White Sox opener has been postponed, which is fine. I don’t mind delaying this 95-loss season another day. It’s not spring yet, anyway. It’s the sort of April rain that feels like the lingering of March, the whole month of which felt gray and wet, a Smarchian sort of slog.
You look out the windows and see the dull and lumpy sky wrinkle itself in a thousand plinging puddles, and watch the puddles grow and slink off toward the sewer, and its hard to remember that it’s only been a few hundred years that rain has been allowed to land that way. It used to fall on the ground, and slowly make its way across whatever basin it found itself in, if it weren’t used up or simply evaporated, reimagining its particles into invisibility so it could fall again.
But that’s not the way it is, anymore. It’s a profound change, and the short-term effects have been, in some ways, disastrous. To build our cities, we’ve altered to way water has distributed itself around the world. We’ve paved over floodplains and changed rivers. We’ve manipulated drainage.
Look at a very minor example, the North Branch of the Chicago River. Patti Welti of DNA Info has the story.
A total of 1.67 inches fell, a record for March 30.
It wasn’t enough to push the North Branch of the Chicago River to flood, but the water did rise more than two feet during the morning and early afternoon.
How does less than two inches translate into more than two feet?
Before the Chicago area was extensively settled, the river meandered across a marsh-like geography, dispersing water over a greater space. Precipitation was absorbed by vegetation and stored in the ground, wetlands and flood plains, according to the report.
As the area became more urban, green space was paved over, wetlands were drained and the river was straightened to better collect runoff that would have previously seeped into the ground. The result is a watershed with very little stormwater capacity, the report explains.
So much of urban history has been about how to drain marshes and swamps. There were enormous struggles in England in draining The Fens, which led to political upheaval, revolutions, and other intrigues. These were enormous marshes, the “sink of thirteen counties”, as Daniel Defoe described them. But the English managed to straighten the rivers and turn the Fens into farmland.
Or one could look at the Great Black Swamp that used to cover much of Northeast Ohio, a terrible oozy wasteland that slowed down water flowing into Lake Erie. This was a swamp that was nearly impassable by anyone who didn’t know exactly how to transverse its deep sludgy waters, and was frequently a refuge for natives, who could get through it faster than European-Americans could get around it. Draining it was an enormous accomplishment that led to the creation of cities like Toldeo, not to mention millions of acres of farmland.
Funny thing, though. It turns out the swamp helped keep Lake Erie clean, serving as a natural filter for whatever came through the basin’s rivers. The enormous runoff that resulted, combined with chemicals from the regions farms (which the swamp would have filtered) is one of the main reasons why Lake Erie has died several times. The swamp helped keep away the algae blooms that have decimated the lake.
So we don’t know. We don’t know how these experiments will end. The Chicago River was slow and windy, often more marsh than river. It wasn’t meant to be a straight channel. Maybe straightening it was the price of the city. Maybe paving over its wetlands is how we were built. And maybe it will be fine.
But a rapidly rising and fast moving Chicago River, devoid of any drainage, is, in a very literal sense, unnatural. The short-term effects of how completely we’ve altered our landscape are only beginning to show. The long-term effects are unknown. But, with the rushing clarity of a springtime flood, we know one thing: water always wins.
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