Water | Venice: I am not making this up

Acqua alta: some plusses and minuses

March 5, 2010 2 Comments

I realize it may sound strange to refer to there being “plusses” to acqua alta. Let me just say I don’t mean “plusses” in the sense of winning a large chunk of the lottery. But there are in fact some positive aspects to it.

The tide has dropped and left our street looking clean but feeling a little icky under our feet.

For instance, many Venetians have told me that acqua alta is a good thing because it washes the streets. This is true. Unfortunately, it also deposits a fine layer of silty slime. And while it does remove some of the dog poop, it also leaves detritus behind, so the general landscape isn’t much prettier than it was before the water rose. So, you know. We could go on like this, pro and con, all day.

But let me point out something that is hardly ever remarked on, in the many and varying accounts of this event: Acqua alta is actually a very good thing for the barene (the lagoon’s marshy wetland islets). If we can focus our minds briefly on something other than our own immediate convenience, it’s worth remembering that the lagoon has its own needs which are being met ever more rarely. So if it likes a good soak, I don’t see why it (by which I mean the whole ecosystem: microorganisms, plants, birds, etc.) can’t have it. Also — speaking selfishly — rowing when the water is high is magic.

A view of one of the nearly submerged barene in the northern lagoon, enjoying its bath almost as much as we're enjoying rowing around in a little Venetian sandolo.

Back in town, here are a few of the positive and less positive aspects of acqua alta, as I see them:

It doesn’t last long. Acqua alta is a tidal event. Unlike your raging rivers, it has a predictable time frame. The tide comes in for six hours, and goes out for six hours. True, sometimes it doesn’t go out as much as it should, but it eventually does go out. This coming and going means that it’s really bothersome for only about two hours.
It’s fairly tranquil. Inexorable, I grant you. Anyone who hasn’t watched the water rising near one’s front door (as we have) hasn’t fully grasped the fundamental meaning of “Time and tide wait for no man.” But the typical reports of high water in Venice make it sound as if Niagara Falls is pouring through your living-room window (CNN once referred to the “Adriatic bursting its banks.” Banks? Bursting? Are we suddenly in Holland?), when in reality it’s more like the bathtub slowly overflowing. Water in both cases, I agree, but not really the same.
It is predictable. True, raging rivers are also predictable, but some of the factors influencing acqua alta, such as the direction of the wind, can change. In addition, we get plenty of warning. If you don’t want to wait for the sirens to blare, just look at the barometer. (You do have a barometer, don’t you?) The lower the pressure, the higher the water. Check the sky: Full or new moon? There will be more pronounced highs and lows. Wind from the southeast? Not good; it will prevent (or slow) the regular retreat of the tide. We want a southwest wind (garbin) or better yet, northeast (bora). Those will settle acqua alta’s hash.

I’ll tell you what’s really annoying about acqua alta, apart from the distraught articles that keep getting published. It’s not that you have to put on boots for a few hours. It’s that:

When the tide goes out, it leaves all kinds of detritus
This is a modest example of a street not long after the tide has gone out. Clumps of eelgrass and bits of reeds are unavoidable and even not so ugly. It's the other stuff, pieces of plastic and styrofoam and general junk littering every wet street that are ugly. Unavoidable, fine. But there is no telling when, if ever, someone is going to sweep it up.

all over the sidewalks. Stuff that was just floating gently comes to rest on whatever pavement was just below it when the last inch retreated. Also, if anyone puts out a plastic bag of garbage the night before (yes, despite the warning sirens — dumb, I agree), that bag will be floating around the street and either settle on the pavement somewhere or drift out to sea. Neither case is highly desirable, though obviously the second is worse.

Once the water lifts your bag of garbage, it's not yours anymore. So hey, let it go wherever or however it wants to, who cares.

The garbage-people will be extremely slow in collecting the trash and/or — make that just “or,” they can’t seem to do both in the same day, even when the sun is shining — sweeping away the detritus, which means the streets look more or less like a slum. The garbage-people are slow because … I’ve tried to understand this… It may be because they are already so desperately overworked that high water adds an insuperable burden (you’re believing this, yes?), and because they are otherwise urgently and industriously occupied in setting up or taking down the temporary walkways over the high water (sometimes yes, mostly no). But they seem to get a special pass on their normal work when the acqua is even moderately alta. I can’t explain it, except to compare it to the mysterious sore throat which a kid who doesn’t want to go to school suddenly develops when it rains or snows.
Transport gets all scrambled up,
not only for taxis and barges but also some vaporettos and/or motoscafos. They have to change their normal routes because the high water prevents them from passing under certain bridges. There are alternatives by which they resolve this temporary dilemma, but it adds inconvenience to your own trajectory. As for heavy work boats and taxis, they either have to pick another route from A to B, or wait for the tide to turn. Tiresome, true, but hardly the stuff of calamity.
Your front door swells. If you have been so unfortunate as to have even an inch of water come inside (and for many people, this just means it has reached the edge of a staircase leading up to their apartment, not the apartment itself), and your front door is made of wood, it will soak up the water and then want to stick. It will take a while to dry out. Like, maybe weeks. You may end up having to sand it down some. Irritating. Not disastrous.

Acqua alta? We'll just put that lamppost up higher. This was one of the more clever responses to the big one of November 4, 1966. Also, you can see that the dogs love it.

I think if you’re going to live here you need to accept the fact that you’re sitting in the middle of a tidal lagoon. If that creates really too many problems, it might be good for you to consider moving. At least to the second floor, or maybe across the bridge to the mainland. No more worries about the tide coming ashore over there. All you have to deal with there, even as nearby as Mestre, are rivers and rain and totally inadequate storm drains. Which leads to flooded basements full of water that actually has little or no natural urge to recede. Fun.

No emotional articles about that, though. Who cares about a foot of water in somebody’s garage? Nobody — at least not until that somebody snaps a picture of a person rowing around the car or trailer.

Nature, Problems, Water

Acqua alta: here we go again

March 3, 2010 2 Comments

If there’s one thing people everywhere know about Venice, it’s that sometimes those romantic canals try to barge into your house.

This is the kind of image that is often presented as "the end is nigh" for Venice. As you see, the man is having hysterics.

Rather than “flooding,” Venetians call this acqua alta, or “high water” (literally “high tide”). Or, depending on how deep it’s likely to be, sometimes they call it “acqua in terra,” or “water on the ground,” which is less dramatic and often more accurate.

I’ve got water on the brain at the moment because night before last, the warning siren sounded again. It indicated the lowest predicted level, one out of four, which was nice, and in the end we barely got any at all. With rare exceptions, acqua alta, more than being some kind of apocalyptic affliction, as it is often portrayed, is really a low-grade nuisance. If it happens often, as it has this winter, it becomes as annoying as any other uninvited guest who doesn’t realize it’s time to go home.

There are so many notions people have about high water, based on the generally inaccurate and overwrought accounts in the press, that I thought I’d review and readjust a few of them.

It’s always happening, or likely to happen. Not really. This winter we’ve had more acqua in terra (again, not really what I’d call “alta”) more often than many other winters. On the other hand, there have been years when I haven’t put my boots on even once. Yet all kinds of claims keep being thrown around in stories written about this little phenomenon. The website of the basilica of San Marco states that water begins to flood the Piazza San Marco, just in front of the church, 250 days a year. Check my math, but that works out to 8 months. A photo caption on the National Geographic website claims that Venice has high water ten times a month. That’s crazy talk.
It creates, or will create, really big, really bad problems.
If for some reason your kids (or somebody else's) don't have boots, high water can be somewhat demanding. Then again, why don't they just go barefoot? I've done it and I'm still alive.

I’m not sure what people think those might be, but the words “acqua alta” seem to inspire a lot of hyperventilating outside Venice (and even inside Venice, mostly from merchants around the Piazza San Marco). I’m not saying that having to put the stuff in your store up on higher shelves isn’t annoying, or that having to sweep out the receding brackish water and then wash the floor with fresh water isn’t annoying. But in 9 cases out of 10, the situation doesn’t exceed the annoyance level — not much worse than having to shovel the snow out of the driveway for the fiftieth time this winter.
It’s going to be alarmingly deep. Those fun photos of people rowing boats in the Piazza San Marco don’t ever show how deep the water actually is. (In fact, those boats can be rowed in four inches of water.) Venice isn’t flat as a griddle — the streets undulate as much as the water does, which you discover when the water comes ashore. There can be dry spots even in a wet street.
The entire city’s drowning. The municipal tide center reports that when the tide is predicted to reach 110 cm above mean sea level, 14 percent of Venice has water on the ground. And that that might not be a depth of more than an inch or two. Fourteen percent doesn’t strike me as an immense area, and several percentages of that would always be the Piazza San Marco, the lowest point in the city.
When the water starts to rise in the Piazza San Marco, it looks like this. Sometimes it doesn't get any higher than this amount. I guess you could say Venice was flooding, but there are still plenty of dry spots left.
It’s going to hurt you, or hurt something. Not that I’ve noticed. Acqua alta is nothing like real floods. Rivers overflowing their banks in torrential rainstorms are dangerous; tsunamis are dangerous. With acqua alta, nobody dies. People survive, buildings survive, art works are fine. The water rises very gently, even politely. Despite the distraught tones in which the event is almost always reported, I still don’t understand why the mere term seems to have acquired such a menacing overtone.
If the water rises near a low sidewalk, it flows over the edge. It's even more common -- as here in the Piazza San Marco -- for it to come up through the storm drains. Naturally it also goes out the same way.

Acqua alta is not dangerous. It’s not even especially upsetting. In my experience, if it happens more than a few times, though, it can begin to seem like a two-year-old who’s gotten into the “Why?” groove. Nothing wrong with it, really, except that it gets to be irritating. The kid turns three, and spring and summer come, and all of this fades from memory.

In my next post: A few real-life aspects of acqua alta which tend to mitigate its fearsome reputation.

True, this was not one of our most amusing moments. And it didn't stop there, nor did our impressive barrier do much good to keep it out. This was once in six years. — True, this was not one of our most amusing moments. And it didn't stop there, nor did our impressive barrier do much good to keep it out. But this has happened only once (for about two hours) in the six years we've lived here.

If you were looking for a new apartment and saw this, you might think twice. The barrier you could kind of accept, but a pump as well? Not good.

Boatworld, Problems, Tourism, Venetian-ness, Water

Motondoso, Part 4: The lagoon’s-eye view

January 27, 2010 1 Comment

Quick review so far: Who or what does motondoso hurt? You’re going to say “Buildings and sidewalks.” It’s obvious.

Buildings are what people care about — logical, since no buildings, no Venice. Some Venetians have told me that they don’t believe anything will be done to resolve motondoso till an entire building collapses, a notion that once seemed idiotic until I came to realize that it could happen. A building collapsing, I mean, not that it would lead to any meaningful action, though one can always dream.

So perhaps some structure really will have to be sacrificed, like an unblemished white heifer, for the benefit of the tribe. The idea has a romantic, mythic quality to it that’s almost appealing.

You could also say “People,” about which I haven’t said much, if anything, and you’d be right again. The most obvious hazard that waves present is the risk of capsizing; every so often you read about some tourists in gondolas who have gone into the drink. There was even a traghetto (gondola ferry that crosses the Grand Canal) that got blindsided by an anomalous wave and the whole cargo of passengers went overboard. I seem to recall that a small child got caught beneath the overturned boat, but one of the gondoliers pulled him out in time. Some years ago an American woman drowned. Fun.

Erosion caused by the waves continually sucking soil out from under and between stones means the stones collapse, but sometimes a person collapses with them. It happened to a woman walking along near the Giardini one day — she put her foot on a stone, it gave way, and faster than you can say “Doge Obelerio Antenoreo” she fell into a hole higher than she was. Nobody in the neighborhood was surprised; they’d been sending complaints to the city for months to no avail.

Then there was the child playing on a stretch of greensward at Sacca Fisola facing the Giudecca Canal when a hole suddenly opened up beneath him. If a man with quick reflexes hadn’t grabbed him, the child would long since have gone out to sea. Events such as these — and may they be few — no longer inspire surprise.

This satellite view of the Venetian lagoon gives a general hint of the variations in depth. These variations are part of what make it a lagoon and not, say, Baffin Bay.

But what if you weren’t a human? This question may not often cross your mind, but Venice looks radically different to its other fauna, and not a few flora, as well. And waves are not their friend.

What really makes Venice so special is its lagoon, which covers 212 square miles. Without the lagoon and its concomitant canals, Venice would merely be a batch of really old buildings — beautiful or not, depending on your taste — which could just as well be sitting on the outskirts of Enid, Oklahoma.

I will be expatiating on the lagoon on another occasion. (A Venetian word, by the way: laguna). The witness (that would be me) is instructed (by me) to stick to the topic at hand, which is waves.

A more detailed view of the lagoon immediately surrounding Venice gives a better idea of how the area is shaped. These shallows, though, are not barene. (Photo: oceana.org)

The Venetian lagoon is a silent but intimate partner in Venice’s fate. Not only are the waves undermining the foundations of the city, they are scouring away the foundations of the lagoon. And while damage to buildings is certainly important, there is arguably even more damage being done to its waters. And they’re going to be a lot harder to fix than a palace.

So if you haven’t got time to watch what waves can do to buildings, you should take a look at what they do to the lagoon — specifically to the barene (bah-RAY-neh), the marshy, squidgy islets strewn about out there. Venice was built on 118 of them.

These are barene. Looks like lots, but 60 years ago there were half again as many. That was a real lagoon.

Barene are the building blocks of the lagoon. They form 20 percent of its total area, and are crucial to everything in it: microorganisms, plants, animals, birds, fish and, till not so long ago, also people.

Let’s say you have less than no interest in ecosystems and their inhabitants, at least the inhabitants smaller than humans. Barene, along with their myriad meandering capillary channels, are perfect for slowing down the speed and force of the incoming tide. They act as a built-in assortment of natural barriers which, if they could remain where they were, would already be limiting the force and the quantity of acqua alta in good old Venice.

But over the past 60 years, half of the lagoon’s barene have been lopped away by waves. The World Wildlife Fund estimated, several years ago, that at the current rate of erosion (erosion caused by motondoso), in 50 years there would be no more barene left.

A cross-section of a barena near Burano. If you were an endangered bird, or even just a really tired one, this patch of mud would be more beautiful to you than twenty Titians.

Why do we care? Even if all we’re really interested in is buildings, we care because as the barene diminish, the tide can reach the city faster and ever more aggressively. The natural brakes, so to speak, are being taken out.

And we also care because, as I have probably said before, whatever a wave can do to a batch of mud it can and will eventually do to bricks and marble.

Part 5: Solutions?

Waves are as destructive to wetlands as they are to buildings, but the wetlands can't even put up a fight.

The large pilings were put in ages ago, to mark the line between the channel and the barena. As you see, the waves have shrunk the barena, so the large pilings are only sort of symbolic. As a bonus, we see the remnants of the wall of smaller pilings which was installed to prevent any further erosion of the barena.

The distance between pilings and barena here is just another of many examples of the very simple effect of waves.

I remember when this channel was only half this wide. Most of these boats belong to people from the mainland who come all this way so they can just sit. Lovely, admittedly, but they bring waves and take away part of the lagoon when they go home.

Tourist launches of all sizes offer day trips around the lagoon.

Taxis are always in a hurry, especially on airport runs. (Photo: Italia Nostra)

Ordinary working barges at Sant' Erasmo on a Sunday afternoon. Their owners are almost certainly out in smaller motorboats, but tomorrow it will be back to work with all of these.

Nature, Water

January sensations revised

January 22, 2010 1 Comment

(I discovered too late that my previous version needed some weeding at the end. This has been cleaned up. Apologies.)

January is a first-class month here (I’ll let you know if I think of one that isn’t).

Nothing against gray. Gray can also be beautiful here, often more beautiful than blue.

I say this for two reasons. First, the end of the month — or more or less starting now — is composed of the so-called “giorni della merla,” or days of the blackbird. Specifically, the female blackbird, which isn’t black at all, but never mind, and who is commonly believed to be busy building her nest right now for her imminent new brood. This is the only intimation, however remote, of the eventual coming warmth.

Gray actually has a lot of points in its favor.

This designation isn’t limited to Venice; our little interlude goes by the same name all over Italy. This brief span of days — specifically the last three of the month — are famous for being really cold; in fact, they used to be fairly dependably the coldest of the winter. Perhaps they’re not as cold now as they may once have been (though they’re plenty cold just the same), but if we didn’t get a sudden drop in temperature in late January I would be extremely upset. Just so you know.

Those more inclined toward literature than ecology may recall that this frigid period strikes just about on St. Agnes’ Eve, or January 20. John Keats’s eponymous poem, “The Eve of St. Agnes,” sets the mood:

“St. Agnes Eve — Ah, bitter chill it was! / The owl for all his feathers was a-cold; / The hare limp’d trembling through the frozen grass / And silent was the flock in woolly fold: / Numb were the Beadsman’s fingers, while he told / His rosary…” And so on. Odd that I can still remember that from high school.

Unless you don’t like humidity, in which case gray is not your color.

So “days of the blackbird” is just a more attractive way of saying “cold snap,” though at the moment we’re in more of a gray snap. Between fog, snow sputters, and generally heavy overcast, the only light on the horizon is the dimly perceptible gleam of Carnival — a gleam not caused by the sun so much as by merchants’ smiles glinting off loose change.

The second reason I love January leads me to ask: Have you ever wondered where all the water of the acqua alta goes when the tide turns? There is a phenomenon which is particularly Venetian and again, I notice, dedicated to a female figure. In these few weeks, when the water gets let out of the lagoon it reveals the “seche de la marantega barola” (SEKK-eh deh la mah-RAN-tega ba-RO-la), or the exposed mudbanks of the shriveled old hag. The Befana, they mean, even though she went home two weeks ago.

I suppose they could have called them the seche of St. Agnes, but it just isn’t the same. From what I gather, it would have to have been rendered as the “exposed mudbanks of the young virgin martyr.” Not bad, but still.

The lagoon is particularly beautiful in two ways when the year begins. First, with real cold, the water becomes utterly pellucid. Peering down from the bridge over our canal, I can easily make out all sorts of debris in perfect detail, down to the number on a lost license plate settling into the mud. Out in the lagoon, the water has an amazing Caribbean/Greek island transparency.

Second, and just as beautiful as the water, is what you see when the water goes away. The “seche de la barola” are startling prairies of luxuriant emerald algae emerging from the shallows, replacing the usual water with verdant swathes worthy of Nebraska.

I love this, not only because it’s so strange (the first time, anyway), but because it shows in one of countless ways how alive the lagoon is. As the late-January twilight briefly weaves itself into the fading sky with soft skeins of mist, the tide silently turns and this extravagant greensward begins to imperceptibly sink beneath the water again. Imperceptible to me, perhaps, but not to the feeding waterbirds tiptoeing delicately among the soggy tussocks, seeking one last little morsel.

In the city, you may notice that the boats are very low at their moorings. One year I even saw boats sitting on bare mud along the shores of the Grand Canal. That was exciting. It was like being in Fowey, or one of those other little ports in Cornwall where the tide leaves fleets of pleasure boats sprawled yards and yards from the water’s edge.

Oddly, this low tide happened at dawn in June a few years ago, rather than dusk in January. But you get the idea.

The seche de la barola are well-known to the municipal tide office, which publishes the daily tide predictions on its website and also in the Gazzettino. One symptom of how the tides have gone haywire in general this winter isn’t so much (to my mind) the high water, though that makes such entertaining pictures. It was how the anticipated low tides refused to go low. They just refused. You can see it here:

The lower line indicates the previously forecast high and low tide levels. The upper line traces what is really happening. Quite a difference. And this went on for days.

To give you an idea of what I mean by “low,” here are some numbers on the seche a year ago.

Istituzione Centro Previsioni e Segnalazioni Maree
Minimi di marea <-50 cm Punta della Salute â€“ anno 2009
Estremali <-50 cm
N °	Data			Ora solare		Valore
1		09-Jan-09	16.20		-52
2		10-Jan-09	16.35		-57
3		11-Jan-09	17.25		-58
4		12-Jan-09	18.05		-59

Minus 59 centimeters is 23 inches below the median sea level. Just so you know.

So come visit sometime in January, and see what the Befana left behind. She’ll be back next year to do it all over again.