Showing posts with label water levels. Show all posts
Showing posts with label water levels. Show all posts

Venice in the rain

It's a rainy evening. When its wet for an extensive period of time and I start to carry my umbrella every day, my mind turns to memories of other cities I've seen in the rain: Seattle, London, Milan, Venice...

Have you ever been to Venice? I remember visiting in the 1980s during a rainy period. I was standing in St. Mark's Square. The rain was falling and the tide was rising. Within minutes water started lapping up from the gondola moorings. It rose up the steps and came creeping onto the square. In the middle of the square, water bubbled up from underneath, through holes in the stone and marble and through grates, the water burbling like a pot boiling, and within minutes the entire square was flooded. Crews of workers appeared and laid out platforms, rows of wooden planks, for the public to cross the square. Like walking on long tables, we used those raised footpaths to walk around the centre of the city.

It's a scene that's repeated many times in Venice when the "acqua alta" - high water - comes calling. A huge project is underway to create a barrier that can be raised in the lagoon when high tides or rain surges hit the city. The "Moses" project, (MOSE in Italian, "Modulo Sperimentale Elettromeccanico") should be completed by 2012. As concerns about global warming and rising water levels grow, other cities will be watching this project with interest (New Orleans, for one).

Like the water, memories of Venice come flooding back. A restaurant by the canal. The lamp lights and couples walking down quiet narrow alleys at night. The bridges and worn marble steps. Boatmen and business people at the espresso bars in the morning. A living city, not just a tourist attraction.

Venice, whether water-logged or dry, leaves an impression and is worth preserving.

Like so many visitors, American writer Paul Theroux was smitten:

"I took a water-bus from the Lido to Venice proper, and approaching this city in the sea, glittering in brilliant sunshine, I began to goggle, trembling a little, feeling a physical thrill and unease, in the presence of such beauty, an exultation amounting almost to fear."

"...It is man-made, but a work of genius, sparkling in its own lagoon, floating on its dreamy reflection, with the shapeliest bridges and the last perfect skyline on earth: just domes and spires and tiled roofs. It is one color, the mellowest stone. There is no sign of land, no earth at all, only water traffic and canals. Everyone knows this, and yet no one is prepared for it, and so the enchantment is overwhelming. The fear you feel is the fear of being bewitched and helpless. Its visitors gape at it, speechless with admiration, hardly believing such splendor can shine forth from such slimy stones." (From The Pillars of Hercules, 1995, Putnam.)


(Photo courtesy of Paola da Reggio -- Public domain, Wikimedia Commons.)

Why is the water dropping in the Great Lakes?

If you walk along the shores of any of the Great Lakes these days, you notice that the water levels have dropped significantly.

This morning I was down at the Lake Ontario waterfront and saw for myself that the water line is about a foot-and-a-half lower than last year. Moorings and pilings are getting higher and drier.

Scientists and environmentalists are not sure what's causing this drop in water levels. It may be a change in rainfall patterns, it may be related to global warming or, as others suggest, it may be related to human activity, like dredging and industrialization in the Great Lakes basin.

Whatever the cause, it's disturbing. We can only hope it's temporary. According to the U.S. National Oceanic and Atmospheric Administration, between 1998 and 2000 the levels of Lake Michigan and Lake Huron fell at the
fastest pace ever recorded and the situation is similar to the drop that occurred during the Great Depression in the 1930s.

Earlier this year, residents on both sides of the Canadian and U.S. border pushed for an investigation into whether erosion in the St. Clair River, between Lakes Michigan and Huron, was causing a big drop in the water level in Lake Huron. The
Georgian Bay Association wondered whether dredging had caused erosion significant enough to cause nine billion liters of water per day to drain from Lake Huron into the lower Great Lakes and out into the ocean.

A few weeks ago, the International Joint Commission, which provides information to both the American and Canadian governments, concluded that there's no evidence that erosion is the cause. The
findings are still preliminary, but video pictures from the bottom of the channel seem to indicate a stable rock bed. However, many questions remain to be answered and more studies, over longer periods of time, will need to be done.

We've seen lots of related stories in recent months. Residents of Atlanta went through a
difficult summer, as a prolonged drought in the Southeast led to significantly reduced water levels in Lake Lanier, a primary reservoir for the city.

Let's hope science provides some clues to the cause of these changes. It really would be a sign of trouble, I think, if the Great Lakes were to continue drying up.


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Photo: http://www.stock.xchng/