
Seems like nothing but bad, really bad, news for the last couple of years when it comes to what’s going on in our environment–megadroughts, wildfires, tsunamis, devastating hurricanes, and, just this month, a massive mudslide in Brazil. No, I’m not referring to the alcoholic concoction; I’m talking about dirt and water mixed together surging downhill to wreak destruction. Watch out below!
The day after Valentine’s Day was a real letdown in Petropolis, Brazil. First, down came the rain. A month’s worth of rain, more than ten inches, fell in a short three hour period–the heaviest rainfall the area had experienced since 1932. The torrential downpour gave rise to a dangerous mudslide. Dozens of hillside houses were destroyed. The flood raged down city streets sweeping away cars and buses in its path. Houses were buried in the mud, and lives were lost. Brazilian president Jair Bolsonaro announced that at least 176 people had been killed with over a hundred more still missing. Reporters described the scene as looking like a war zone.
The location and history of Petropolis make it particularly vulnerable to the threat of mudslides. For those who never studied Brazilian geography (raising my own hand), pinpointing the Brazilian city on a map is an impossible task. But we’ve all certainly heard of Rio, the second largest city in Brazil and the site of the 2016 Summer Olympics. Petropolis is located in the valley of the Serra dos Orgaos mountains about 42 miles northeast of Rio. Its location near mountains means there are areas higher up from which mud can flow down on it.
Petropolis’ back story also contributes to its vulnerability to this type of natural disaster. The city’s name literally means “Peter’s City” to honor Pedro II, the last emperor of Brazil. Its proximity to Rio made it a favorite summer getaway for 19th century Brazilian royalty. Palaces were built there leading to the city’s nickname of the “Imperial City.” Today the area remains a popular tourist spot.
Following the rich to Petropolis were the poor. They couldn’t afford to build houses in town, so they haphazardly built on the nearby mountainside leading to deforestation and poor drainage. Although I’m not a city planner, even I could see that this type of growth set the area up for a natural disaster to happen.
And the February 15th mudslide wasn’t the first one to occur. One in 2011 caused over 900 deaths. So what did the city government do? Why it did a study and found that 18% of the city was at high risk of landslides. We all know, of course, that simply looking into a problem is not going to prevent anything, but sometimes people have to learn things the hard way. And the latest mudslide is certainly a hard way to learn that affirmative steps must be taken to prevent, or at least mitigate, future disasters.
But all this occurred in Brazil, you may say. What’s that got to do with us here in the U.S.? Well, quite a bit, actually. Mudslides can be extremely deadly (right, Petropolis?) and can occur in all fifty states. Thus, any American could be affected by this naturally occurring disaster. The West Coast, particularly California, is considered especially prone to mudslides since it experiences earthquakes, rainfall, and wildfires which contribute to them. Mudflows are common in the hills around Los Angeles where they have destroyed many hillside houses. People know mudslides may occur there, yet homes still continue to built in those locations. Are they tempting fate??
Given the potential to be affected by one, it behooves Americans to know something about mudslides. Ignorance may be bliss, but knowledge might save your life of the lives of your loved ones. So let’s learn more about them.
Landslides are a serious geologic hazard involving a movement of a mass of rock, debris, or earth down a slope. Debris flows, a specific type of landslide, are typically referred to as mudslides or mudflows and are fairly common. These flows consist mainly of mud and water with fragments of rock and other debris. They are fast moving and behave like floods. Usually starting on steep hills or mountainsides, mudslides gain momentum the further they go, reaching up to 35 mph. Houses can be moved off their foundations and places buried within minutes due to incredibly strong currents.
Unusually heavy rains often trigger mudflows. Thus, these disasters tend to occur during the wetter seasons; nevertheless, mudslides can occur any time of the year and can strike without prior warning. (Sorry, no time to prepare a kit like you do for hurricanes.) They usually happen after water saturates the ground on a slope very quickly after a heavy rainfall.
While man cannot control the amount of rainfall (at least yet), he can control other factors which contribute to the occurrence of mudslides. Construction and modification of the land–removal of vegetation and deforestation, for example–increase the risk of such a landslide as does climate change. Of course, common sense also plays a part. Building structures on slopes where such a risk is known and high is asking for trouble. Engaging in activities which harm our environment and cause climate change that produces natural disasters is also questionable behavior.
Don’t we have enough trouble and bad news around us? Let’s do what we can to avoid more by acting wisely to prevent mudslides and to keep ourselves out of harm’s way in locations where they are likely to occur. If a mudslide is to go down, let it be a delicious, chocolate one which won’t bury a house.
WONDER-ing Woman:
Does it surprise you all fifty U.S. states are at risk for mudslides? Just because you can build a structure somewhere, does that mean you should? Does your awareness of the threat of mudslides here in our country put the story about the mudslide in Brazil in a different light for you?