Tag Archives: urban forest

Not Too Mulch to Ask

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It was a simple ask. Our Chicago First Ward Alderman, Daniel La Spata, included a notice in his e-newsletter about a Saturday morning outing, organizing at his ward office on Milwaukee Avenue, for volunteers to join Openlands Chicago tree keepers to help place mulch around street trees nearby on Armitage and Milwaukee Avenues, and just, well, clean up a bit.

I admit to being an easy sell on urban trees. There is a beautiful century-old American elm in our backyard. Nearly fifteen years ago, I led an American Planning Association project, funded by the U.S. Forest Service, that resulted in a report called Planning the Urban Forest. It’s not that I believe the right trees in the right places improve the livability of our neighborhoods; I know it because of extensive research over many years that I have digested from numerous sources that prove it. I have written about it in published articles.

Volunteers in front of Ald. La Spata’s office, Saturday, July 29, 2023. All photos provided by Huan Song of Openlands.

So, once in a while, I try to put my muscle and time where my mouth is and just get out and do the real thing. All I had to do was register online so that Openlands knew how many people would participate. Besides, working to improve the survivability of real trees in a street-side environment is always an opportunity to learn something. Add my proclivity as a compulsive extrovert, loving the chance to meet and talk to new people, and I was sold. La Spata seemed pleasantly surprised when I showed up just before 9 a.m., but he shouldn’t have been. This is fun stuff for me.

But first, a word about Openlands, the organization with which he allied to provide this volunteer service opportunity. Openlands is now entering its seventh decade as a regional conservation organization, having been launched in 1963. They have consistently offered a regional vision for a landscape of land and water trails, urban forests, and public gardens, all with an eye to enhancing access for city residents. Together with the Morton Arboretum, based in Lisle, Illinois, they have provided a strong voice for the value of open space and trees in the metropolitan area that have kept people aware of the opportunities for a healthier and more biodiverse environment. While I have not been directly involved in Openlands, I have served for several years on an advisory board for Morton Arboretum’s Chicago Regional Trees Initiative, which has produced model ordinances and programs for communities throughout the region. I highly recommend visiting either or both websites and learning more about their programs in this time when climate change is threatening our urban quality of life.

But back to the scene of the volunteer work. More than a dozen volunteers, many of them certified Tree Keepers for Openlands, showed up. We initially were briefed on the day’s activities, including the areas where we would be working. We would not be planting trees—that is up to the city when it comes to street trees. Nor would we be pruning, which must be done by professional arborists. But we would be working with someone from the Chicago Streets and Sanitation Department, which provided a city truck to pick up any debris we picked up, or garbage, such as empty mulch bags, that the operation generated. Mostly, we used mulch to fill in boxes around street trees, not overloading the site but enough to protect the trees.

We also dug up and removed some burlap bags that contractors had left around some street trees, in order to allow them to grow and breathe better. That was not always easy because they become buried in the compacted soil, making them hard to extract and remove. Aside from personal fitness, I sometimes wondered what other benefits came from my twice-weekly strength and cardio workouts at a local gym. Now, I realized I was well trained to provide the powerful yank that some of these bags needed to pull them out of muddy soil for disposal. Fitness can serve practical purposes.

We were also fortunate that the weather was perfect for the occasion. The high temperature was in the low to mid 70s that day, so the only time I sweated a bit was when, on one occasion, I had to labor extra hard to remove one of those burlap bags. It was sunny but bearable. I had forgotten my sunglasses, but really did not need them.

Toward the end, as our crew had worked its way northwest on one side of Milwaukee Avenue and then back down the other toward the ward office, we were adding mulch in front of a relatively new nonprofit used bookstore, Open Books. If there is one diversion that can get my attention in addition to trees, it is browsing a bookstore, where some trees find a new but lasting use. I also needed to use the bathroom, so I asked the clerk at the checkout desk. On the way back, I mentioned that, on her birthday a few days earlier, my wife and I saw Oppenheimer at a movie theater before getting dinner nearby. Did the store have copies of American Prometheus, the Kai Bird book that inspired the movie? She looked, and they did, and I walked out with a used copy for a little over $13. Combining that with improving the neighborhood environment made for a successful morning, I felt.

But soon, as noon approached, we had a debriefing on what we had accomplished and any useful suggestions from volunteers. I suggested making wire cutters available because we had encountered chicken wire in some of the tree boxes, something much more problematic than burlap boxes, which eventually biodegrade. I don’t recall what else was mentioned, but our crew leader took notes.

Next to the aldermanic office was an outlet for Jersey Mike’s. I had joked that we should all walk in and tell them we had heard that they were planning to feed the volunteers. We laughed but obviously did no such thing. But the thought of a good sandwich burrowed into my brain, and with less than half a mile to walk home, I entered the store and ordered a turkey sandwich, Mike’s way, and took my prize home for lunch, accompanied by Cheetos and a chocolate chip cookie. The sandwich was the only likely source of nutrition, I suspect, but along with some lemonade from the refrigerator, it felt like an adequate reward for making a small difference in a big city.

Jim Schwab

Truly Hard Wind

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What in the U.S. Midwest would spur comparisons to a hurricane? What could spread damage over an equally wide area? It is a good bet that most people are unfamiliar with the word “derecho,” which comes from Spanish, meaning “straight,” but such a storm made itself felt just three weeks ago in Iowa, Illinois, and Indiana, as well as parts of Nebraska and Wisconsin. The Spanish word with an adopted meaning in English refers to such a storm’s powerful straight-line winds, as opposed to another adapted Spanish word, “tornado,” literally meaning “turned,” which, of course, refers to a cyclonic, or spinning, meteorological phenomenon.

The Event

On August 10, a derecho took shape in eastern Nebraska and the southeastern corner of South Dakota early in the morning. The city of Omaha suffered some of the initial damage, with an estimated 57,000 people losing power. But as it roared across the center of Iowa, the storm, as derechos often do, rapidly gained wind speed until estimated winds of 140 miles per hour struck Cedar Rapids and surrounding Linn County in eastern Iowa. Nearby Iowa City, home of the University of Iowa, also suffered extensive damage. Derechos can and typically do strike with little warning, unlike hurricanes, but even at speeds of 90 to 100 mph, in this case, it still takes hours to cross Iowa from west to east, and even longer to reach Illinois and Indiana.

Thus, my first warning of what was to come, sitting here in Chicago, was a telephone alert from the University of Iowa around noon that day. I get such alerts because I am on the faculty, although I now teach remotely as an adjunct. But our landline and my cell phone are on the system, so the alerts come automatically. Fortunately, that gave me most of the afternoon to prepare for what was coming, which arrived in our area around 3:45 p.m. Winds and rain pounded on our skylights for nearly 45 minutes, leaving numerous branches and twigs on the ground from our stately American elm, which towers above our house and garage and has probably withstood other storms for at least a century. It was already huge when we built our house in 1994, and we chose to make it sure it remained. Even this storm caused it only minor damage.

The same could not be said of many street trees in parts of Chicago. Trees often collapsed on top of parked cars, leaving many owners to bemoan what became of their vehicles—or, in some cases, the roofs of their homes.

Even the repose of the dead was not left undisturbed. Graceland Cemetery, one of the more famous in Chicago, faces months of repairs and replanting and is closed for six weeks. The storm uprooted about 40 trees and damaged numerous gravestones and monuments. It had become a popular place for peaceful strolls and contemplation during the months of coronavirus-induced shutdown. After the storm, it was a visual mess that will cost about $250,000 to repair.

Removing damaged trees in Chicago’s Rogers Park.

One lesser-known by-product of derechos is tornadoes, which can be spun off from the shelf cloud as it moves through an area. In Chicago, two tornadoes, one EF-1 in the Rogers Park neighborhood along Lake Michigan near the city line with Evanston, literally buzzsawed trees in an area of densely built multifamily housing and small

Insurance claims agents inspect building damage in Rogers Park.

businesses. A few days later, I visited the area to shoot photos that appear here. At first, driving up Greenwood Avenue, I wondered where the damage was. But as I drove further north and approached W. Jarvis Ave., the answer became starkly obvious. I could not drive beyond that corner because the street was blocked; Jarvis was one way going east, but Jarvis east of Greenwood was also blocked. City trucks were removing damaged trees. After finding a way to park without impeding traffic, I encountered insurance agents on the ground shooting outside photos of nearby buildings, presumably for damaged masonry. Any damaged cars had already been removed.

That tornado, and another that reportedly skipped across the Eisenhower Expressway (I-290) on the West Side, dramatically demolished for some an old urban myth that tornadoes don’t strike urban areas. People believe this for various reasons, including how they think tall buildings disrupt wind circulation, but trust me: I’ve been involved in disaster recovery long enough to know that tornadoes do not discriminate against smaller towns. Rogers Park is very urban. Tornadoes go where they please. This specific tornado eventually skipped out over the lake, becoming a waterspout. But it left its mark.

The storm, by the way, ultimately spun off at least 17 documented tornadoes, mostly in northern Illinois, but a few in Wisconsin and Indiana. All were either EF-1 or EF-0 on the Enhanced Fujita scale. But by far, most of the damage resulted from the straight-line winds themselves, which were often in the range of 90 to 100 mph, with a top measured speed of 126 mph in Atkins, Iowa, making them basically of tornado or hurricane strength. And they sped, over the course of a single afternoon, across all or parts of several states.

By 4:30, the storm had continued its march into northwest Indiana, where it finally petered out. But what happened along the way?

Iowans can attest that it functioned across much of their state like a Category 2, maybe even Category 3, hurricane. Lyz Lenz, a columnist for the Cedar Rapids Gazette, noted in a guest column for the Washington Post four days later that the winds had damaged “more than 10 million acres, or 43 percent, of the state’s corn and soybean crop.” The reduction in harvest in Iowa is likely to be between one-fourth and one-half. The heading on her column referred to the storm as an “inland hurricane” that most people had not heard about. The damage was massive enough to be visible in satellite images.

The damage was not just to crops on the ground, but to hundreds of millions of bushels in storage bins on farms and in commercial storage facilities, according to the Iowa Department of Agriculture. Toppled grain bins were a common site.

Damage to Chinese House roof in Grinnell. Photo by Rachel Bly.

Despite those staggering figures, that was only the beginning. Between Indiana and Iowa, four people died from either falling trees or electrocution, and, in one case, a mobile home tipped over by high winds. Losses of electric power affected approximately 585,000 Iowans, or roughly 20 percent, while 1.9 million lost power in neighboring Illinois. Tree damage in Linn County totaled in the hundreds of thousands, and most buildings suffered anywhere from mild to catastrophic damage. In small towns, like Grinnell, building damage and tree damage to cars was also extensive. Here, I wish to thank Rachel Bly, director of Conference Operations and Events for Grinnell College, for sending me dozens of photographs she shot after the event. Bly, I might note, has a certificate in emergency management from Park University in addition to her MPA from Drake University. The images she shared help convey some reality to the trauma that occurred. Hundreds of other small communities suffered similar impacts. Not surprisingly, Gov. Kim Reynolds issued a state disaster declaration by August 14 for 25 counties, and has sought a federal declaration from President Trump, citing an estimated $4 billion in damages. By August 19, Trump had signed a declaration for Public Assistance (PA) but not Individual Assistance (IA) for Iowa. PA provides aid for restoring public infrastructure, such as roads and bridges and community facilities, while IA provides direct aid to individuals for reasons such as loss of housing.

Power line damage in Grinnell. Photo by Rachel Bly.

Photo by Rachel Bly

Roof seen through the window. Photo by Rachel Bly.

Inside a damaged salon in Grinnell. Photo by Rachel Bly.

 

 

 

 

 

 

 

 

 

Derechos as a Natural Hazard

All this raises the question of what we know about derechos as a wind-related hazard. I will confess that I spent most of my life never having heard the word, let alone understanding what it meant. It is not the most common occurrence, but it certainly ranks among the most destructive. To my surprise, I learned from Wikipedia that the term was coined in 1888 by a German-American scientist, Gustavus Detlef Hinrichs, who had emigrated to St. Louis just before the Civil War. He wrote in the American Meteorological Journal about a storm that struck Iowa in 1877 and described its unique characteristics. Nonetheless, even in the Midwest today, many people are unfamiliar with the term—until they hear it on the news, as they did on August 10 amid storm warnings.  

The gust front “arcus” cloud on the leading edge of a derecho-producing storm system. The photo was taken on the evening of July 10, 2008 in Hampshire, Illinois. Credit: Brittney Misialek. From National Weather Service website.

There are several types of derechos, but the National Weather Service describes a derecho as a “widespread, long-lived windstorm that is associated with a band of rapidly moving showers as thunderstorms.” More specifically, it defines the phenomenon as a swath of damage that “extends more than 240 miles (about 400 kilometers) and includes wind gusts of at least 58 mph (93 km/h) or greater along most of its length.” In plain English, this is a huge, regional storm, not some localized thunderstorm. It exhibits straight-line winds that can be at least double the minimum in the definition, and the August 10 event involved winds far above 58 mph in most locations. Like all such storms, it is a product of unstable atmospheric systems, in this case typically involving a bow-shaped front in a large squall line.

The storms are typically a mid-latitude phenomenon, making North America and the Midwestern U.S. particularly susceptible, but they occur elsewhere in the world as well, including southern latitudes (southeastern Brazil and Argentina), South Africa, China, and even eastern Europe, where a derecho struck parts of Estonia in August 2010, and near Berlin in Germany in 2002. The August 10 event was not the first one I have witnessed in Chicago—another struck in July 2011 and disabled electric power for nearly a million people—but it was certainly the largest in a long time.

70% of all derechos occur between the months of May-August (the warm season). The other 30% occur during the cool season. From National Weather Service website.

As a mitigation planning response, almost no hazard mitigation plan (produced for FEMA approval as a condition of eligibility for federal hazard mitigation grants) for any state or community east of the Rockies (with the possible exception of Florida) should fail to identify derechos as a potential hazard. Moreover, especially in the Midwest, it may be time for states and communities to reexamine their building codes for wind resistance as a means of limiting future damages from derechos. Finally, it may also be time for many communities to examine more closely their urban forestry programs for adequate attention to hazardous tree management. That does not mean refusing to plant trees or removing them unnecessarily as a mindless precaution. It does mean engaging professional urban foresters in an assessment of the urban tree canopy with an eye to ensuring forest health and removing those trees that are most likely to fail under severe wind pressure. Already, the call has arisen for such reforms in Chicago. It is time for planners, environmentalists, disaster professionals, open space advocates, and concerned citizens to seize the moment while they have the public’s attention.

Jim Schwab

Restoring the Chicago Area Landscape

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Outside the Thornhill Education Center, a view of the gorgeous grounds of the Morton Arboretum.

Outside the Thornhill Education Center, a view of the gorgeous grounds of the Morton Arboretum.

Chicago is not terribly old, as world-class cities go. It was incorporated only in 1837. The area was essentially devoid of European settlers until the 19th century. In the preceding centuries, the resident Indians, including the Potawatomi, had created a landscape dominated by oak ecosystems as a result of actively managing the landscape through the use of prairie fires. On the open lands of the Upper Midwest, there were few meaningful fire breaks, and the fires drifted east over vast grasslands. This North American fire regime changed the land by preventing the establishment of woody species, allowing oaks to dominate because of their thick, fire-resistant barks. The oaks in turn allowed more sunlight through their canopy and provided a thriving ecosystem for numerous species, including more than 800 species of birds and moths that eat their leaves.

The settlers who arrived in the 19th century, however, whether wittingly or otherwise, made quick work of the landscape they inherited from the natives they largely pushed out. They suppressed the wildfires in favor of plowing the prairie soils and savannas to create farm fields. Natural wildfires are few in northern Illinois; the wildfires that preceded European settlement were almost entirely a native artifact, which served the purpose of clearing hunting grounds but also served natural purposes of preparing the land for the sprouting of prairie plants. As the oaks receded, other trees moved into the void where fields did not prevent them, and in time maples and basswood took over, followed later by the invasive buckthorn, an introduced species. Today only 17 percent as much oak coverage survives as was present in the 1830s, and the landscape is highly fragmented. By the 1930s, only one oak-dominated parcel of more than 1,000 acres remained; today none remain. The numbers of various smaller chunks of oak land have also shrunk, just as steadily.

Chicago Wilderness, an alliance of organizations dedicated to open space, and the Morton Arboretum believe the metropolitan area needs to reverse the trend soon. Last August, I wrote about the Chicago Region Trees Initiative (CRTI) being led by the Morton Arboretum. On April 7, I attended a pair of meetings at the arboretum’s Thornhill Education Center that aimed at advancing the initiative. CRTI, which benefited for a period of time starting in the 1990s from federal support for some of its environmental projects, is now seeking new sources of funds as federal grants have waned, and is sharpening its focus into six areas of interest in order to clarify its mission for potential funders. Restoring oak ecosystems is one of those six focus areas. Another is landowners; most of the land that could be used to restore the fragmented oak ecosystems is private, and its owners must not only be willing to cooperate with the larger effort, but understand the reasons for it and its potential ecological, economic, and social benefits.

Economic and social? Yes. That is part of the appeal, one we laid out several years ago at the American Planning Association with the publication of Planning the Urban Forest: Ecology, Economy and Community Development, which began with an exposition of the documented benefits of the urban forest across dimensions of human health, pollution reduction, stormwater management, energy conservation, economic development, and other factors. Michael Leff, a research urban forester at the Davey Institute, has been developing a guidance document that stresses how good urban forestry needs to take a three-part approach that is as aware of the social and economic aspects as it is of the environment. Humans are essential to the success of any ecological plan, particularly in an urban setting. Public areas of nature or forest preserves contribute only a partial solution to a much larger problem, and solving that problem contributes significantly to human quality of life. It takes considerable scientific and social awareness to make the urban forest work in a highly developed setting where ecosystem fragmentation has become the norm.

Hence the social mission of CRTI: the need to share the story of the oak ecosystem with a wide variety of audiences throughout the area in an engaging manner that motivates them to take part in the initiative and participate in coordinated stewardship efforts. In addition, CRTI is reaching out to municipal public officials and staff, including planners, to provide training around the issues of municipal tree management and a model tree ordinance that CRTI is still developing for use by communities to advance the goals of urban forestry, including the oak ecosystem restoration efforts. There is also a role for the nurseries that grow trees and a need to keep them aware and involved so that they can be supportive of the overall effort, as well as for landscaping professionals, arborists, and others. I will return to this subject as the initiative progresses and evolves.

Meanwhile, I learned at the meetings of one valuable resource of which I was previously unaware: Bringing Nature Home, by Douglas W. Tallamy, published by Timber Press. So I looked it up, and it draws rave reviews for explaining the value of native plants and ecosystems, just as people at the meeting had said. It’s probably worth a download.

 

Jim Schwab

Trees in the Disaster Recovery Equation

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For the last two or three years, if not longer, I have been engaged in an ongoing discussion with people from the U.S. Forest Service and the International Society of Arboriculture (ISA) about the role of trees in post-disaster recovery. Phillip Rodbell, an urban and community forestry program manager with the Forest Service’s Northeast office in Philadelphia, has been particularly diligent in pursuing the question of how we can better protect trees in urban areas from storms and other major disasters as well as how to reduce the loss of trees in the process of removing debris after disasters. Too often, in the absence of qualified arborists or other forestry professionals, the existing incentives for debris removal cause more, rather than fewer, trees to be cut down and hauled away than is truly necessary. The question is how to change that.

The fact that some trees, sometimes many trees, do in fact get blown down in storms, crushing cars and occasionally people, snapping utility lines, and blocking roads, fosters the false perception in some minds that trees are inevitably hazards in themselves. In fact, inadequate maintenance of the urban forest, including inadequate attention to those trees that really do pose hazards, creates problems that can be prevented with better municipal tree pruning cycles and pre-planning for more appropriate vegetative debris removal after big storms. However, local resources, including professional expertise, can be overwhelmed in a more catastrophic disaster such as a severe tornado or hurricane. The sheer number of trees blown down by Hurricane Katrina, for instance, was staggering, well into the millions.

Phil and I ultimately decided that, if the Forest Service could provide a modicum of money to help sponsor what we decided to call a scoping session, and if ISA and the American Planning Association (APA) could contribute more modestly to support the project, we could perhaps bring together a team of subject matter experts, representatives of relevant local, state, and federal agencies, and people from interested nonprofit associations, and we could foster a meaningful discussion of how to address this problem. In the process, we might help save federal, state, and local governments millions of dollars annually in avoidable debris removal costs.

This spring, we succeeded in bringing that package together and initiating a contract between the Forest Service and APA. The result was a two-day discussion held June 16-17 in APA’s Washington, D.C., offices, involving more than two dozen people, mostly in-person, but with a handful joining by conference call from remote locations in New York and Mississippi. A summary of that discussion, and the issues it addressed, is now available on the APA website, along with a bibliography of resources on the topic, and a series of briefing papers prepared by the invited experts. I invite my readers to check it out. To learn more, click here.

 

Jim Schwab