Tag Archives: urban design

Edible Infrastructures

Just an interesting site I came across in random web surfing. If you really had a clean slate and could turn a computer loose to design an efficient city for you, it might look something like this.

Edible Infrastructures is an investigation into a mode of urbanism which considers food as an integral part of a city’s metabolic infrastructure. Working with algorithms as design tools, we explore the generative potential of such a system to create an urban ecology that: provides for its residents via local, multi-scalar, distributed food production, reconnects the traditional waste-nutrient cycle, and de-couple food costs from fossil fuels by limiting transport from source to table.

Our research is conducted through the building up of a sequence of algorithms, beginning with a Settlement Simulation, which couples consumers to productive surface area within a cellular automata type computational model. Through topological analysis and interpretation of the simulation output, we explore the hierarchical components for a new Productive City, including: the structure and programming of the urban circulatory network, an emergent urban morphology based around productive urban blocks, and opportunities for new architectural typologies.

The resulting prototypical Productive City questions the underlying mechanisms that shape modern urban space and demonstrates the architectural potential of mathematical modelling and simulation in addressing complex urban spatial and programmatic challenges.

 

street congestion ideas

Here is a nice compendium from Plan Philly on dealing with urban street congestion. Although, the term congestion to most people implies high traffic volumes and low speeds, which you could argue are acceptable in cities. I will admit though that here in Philadelphia we need solutions to temporary delivery, loading and contractor parking. These legitimate business activities block bike lanes, sidewalks, and travel lanes because they often have no choice. I’ve done it myself. Pedestrians, bicyclists, and drivers can curse at each other all day – but the same person can be all three at various times, so we are cursing at ourselves. We need solutions and compromises that work for everyone. There are some good, pretty obvious ideas in this article that really shouldn’t encounter bureaucratic or political resistance: larger loading zones, metering loading zones, letting people reserve them in advance, congestion pricing, and off-hours delivery, to name a few.

Joel Kotkin

Joel Kotkin has penned a transparently political anti-urban piece, so transparently political that it’s in Real Clear Politics rather than a major newspaper. He creates a picture of “forced densification” – I imagine people being marched into cities at gunpoint and into Soviet-style high-rise apartment blocks.

Roughly four in five home buyers prefer a single-family home, but much of the political class increasingly wants them to live differently… it has been decided, mostly by self-described progressives, that suburban living is too unecological, not mention too uncool, and even too white for their future America. Density is their new holy grail, for both the world and the U.S. Across the country efforts are now being mounted—through HUD, the EPA, and scores of local agencies—to impede suburban home-building, or to raise its cost.

Of course, people who actually choose to live in cities know this is absurd. Sure, there are high rise apartment blocks and some people choose to live in them. But many people choose to live in row homes, town homes, brownstones, etc. These are single family homes, Joel. Let’s think about land use for a minute. Density is defined by residents per square mile. Density allows infrastructure, open space, and economically productive space to be shared more efficiently by more people. It also allows more people to get around under their own muscle power, i.e. by walking and bicycling. This promotes physical health and mental health, social activity, creativity and innovation. Time spent “commuting” to work on foot or by bicycle is not empty, useless, or wasted time.

Once density drops to a suburban level, most people have to make most trips by car. Cars require enormous amounts of space, for driving but especially for parking. This space is wasted – it is not available for housing or for recreation. It is not economically productive. The infrastructure cost in the suburbs has to be much higher per person, and the economic production and tax revenue has to be much lower per square mile. The enormous amounts of time spent commuting by car are just wasted time – they are not economically productive, supportive of physical health, mental health, or families. Add air pollution and civilization-crushing greenhouse gas emissions on top of all this.

So what does all this add up to? Resources are being sucked out of the efficient denser areas, where they are generated, and used to subsidize the time-, land-, money-, and health-wasting lifestyle in the suburbs. And yet, contrary to what Joel would have you believe, not only are people not being forced into walkable, bikable, communities, but these choices are not available to most Americans.

Forcibly marching people into high-rise apartment blocks wouldn’t be American. Some people really want privacy and large private open spaces to themselves, and certainly those choices should not be taken away. But many people would love to live in truly walkable, bikable communities, and those choices have been denied most citizens of the United States. Giving people true equal opportunity and a free choice of lifestyles, and letting them choose to pay the true cost of their choices, would be very American. Don’t fall for the deceptive double-talk people are throwing out there to try to convince you to support having your choices taken away.

green roofs

Everybody kind of likes the idea of green roofs, but water professionals are not always 100% confident we understand them well enough to promise they will meet water quality and flooding regulations. But the studies are gradually trickling in. Here is a new one from Ecological Engineering:

Increasing recognition is being given to the adoption of green roofs in urban areas to enhance the local ecosystem. Green roofs may bring several benefits to urban areas including flood mitigation. However, empirical evidence from full-scale roofs, especially those that have been operational for more than several years is limited. This study investigates the hydrologic performance of a full-scale extensive green roof in Leeds, UK. Monitoring of the green roof took place over a 20 month period (between 30th June 2012 and 9th February 2014). The results indicate that the green roof can effectively retain and detain rainfall from the precipitation events included in the analysis. Retention was found to correspond significantly with rainfall depth, duration, intensity and prior dry weather period. Significant differences in retention values between the summer and winter seasons were also noted. Regression analysis failed to provide an accurate model to predict green roof retention as demonstrated by a validation exercise. Further monitoring of the green roof may reveal stronger relationships between rainfall characteristics and green roof retention.

Beyond questions on performance, there is a kind of chicken and egg problem where they are not used much (in the U.S., at least) because they are expensive and they are expensive because they are not used much. That is true of many emerging technologies. Of course, this “emerging” technology has been used in Europe for centuries, not to mention it is also popular with hobbits.

alternatives to minimum parking

Seattle has a brilliant, and in retrospective obvious, idea for an alternative to required minimum parking requirements for development. Instead of taking them out of the code entirely, allow developers or landlords to provide transit passes or car share memberships instead. This makes perfect sense. If you wanted to be more equitable, you could channel some or all of the money into a fund that low-income people in the neighborhood could use for transportation. For those who are just catching up, most cars sit parked most of the time and take up enormous amounts of space, generally equal or greater than the space taken up by housing. By reducing this wasted space, you create more space for housing, businesses, parks, or some combination. Depending on what you convert the land to, you can also reduce water pollution, flooding, and heat; reduce stress; improve physical health; improve appearance and property values; and maybe even grow some food. It’s an obvious win for everyone – why are we still letting car industry propaganda drive our culture and shape our cities?

meta-analysis on designing active cities

This is a great example of meta-analysis in Active Living Research. There are a few things I like about it. First, it combines academic literature, other literature, and expert opinion in a very transparent and defensible way, by giving each a score. It takes a very wide array of urban design and planning choices and relates them to a number of outcomes (physical health, mental health, environmental sustainability, health and safety, and economic growth), and draws quantitative conclusions about the importance of each. Some outcomes challenge my pre-conceived notions, for example that street connectivity is bad for safety, but the methodology is very transparent, so I can dig in if I want and try to figure out whether I disagree with a particular rating, or whether I really should rethink my preconceived notion. Those of us dealing with complex planning and engineering programs (and many other complex systems) can’t realistically expect to optimize a handful of objectives any more. Instead, we can play the odds by making sure all our small, daily decisions have a better than even chance of nudging the system in a desired direction, based on the complete body of evidence out there, even with all its contradictions and confusions.

Philadelphia Bike Share

I always say Philadelphia will try things about 5 years after New York tries them. Well, here’s our bike share program.

Bike-Share Comes to Philly With the Launch of Indego from STREETFILMS on Vimeo.

I support this 100%. I know having more riders out there will make it safer for everyone, and I know the statistics on bike share safety are very positive across cities so far. Still, users are going to be hurt and killed eventually, even if the accident rate is lower than other forms of transportation, and the initial instinct will be to blame the users and the program. My only point is that having bike share is not the end of the battle, we need to be demanding safe street designs at the same time. Protected bike lanes and safer turning configurations and signals are the most important things, I think.

parking craters

This video is about how surface parking lots have crowded out actual development in many U.S. downtowns. An interesting thing is happening in Philadelphia, where I live. Surface parking lots that have been here as long as I have (1999) are suddenly turning into development sites, all over turn. This tells me that they were being held in a holding pattern waiting for the next boom. This works in Philadelphia because there were never huge areas of parking in the central city, just smaller lots scattered here and there. But there must be some critical mass where you have so much parking that you no longer have a city at all, and maybe it is hard to recover from that.

The lots that are “temporary” for only a few decades still cause environmental problems of course. Philadelphia has the good sense to charge industrial and commercial landowners by the square foot of pavement for stormwater management, a good policy that more cities should consider (disclosure: I have some professional ties to this program). This general idea of tieing taxes and fees to external costs – in this case the environmental impact of building materials – is basic textbook economics and it works!

In theory, you could cap and trade the right to pave. Initially the credits could be sold to real estate development companies. Then, when the cap is hit, a new development would have to buy enough credits from somebody else who is willing to part with an equal amount of pavement. The alternative would be to use porous materials or low impact development techniques. Credits could be retired over time – either because the government or non-profit groups buy them and retire them, or they could be retired when an owner goes bankrupt or falls behind on property taxes. Maybe they could even be accepted as payment for certain fees or taxes (for example, fees that would have been spent on stormwater management anyway), then retired. Set up a system like this and entrepreneurs would find ways to get in on the game, putting the private sector to work on behalf of the environment.

the suburbs are dying

To my good friends still thinking about buying property in the suburbs – I don’t recommend it! According to Ellen Dunham-Jones, author of Retrofitting Suburbia; Urban Design Solutions for Redesigning Suburbs:

of the 1,100 shopping malls, one third are dead or dying. The 50,000 strip malls have a 11% vacancy rate. Within the 350,000 big box stores, 300 million square feet are vacant. However, you point out these dynamics have been around awhile, with the newest marker being the suburban office vacancy rates of 16-24%. What has changed to make these suburban offices less attractive?

There are several converging factors here. The one most frequently cited by CEOs is the need to relocate to the cities that are attracting the educated 25-34 year-olds that they most want to hire and who, for the most part, find the idea of working in a Dilbert-like suburban cubicle un-creative and toxic. Additional factors include the fact that computers have automated many of the clerical jobs that used to be done in the suburban back-offices at the same time that space/employee standards have significantly reduced. The wave of ’80′s office parks and corporate campuses are aging and increasingly out of date, while the cities have become immensely more livable than they were in the ’70s. So, we’re seeing the tide reverse itself as a wave of corporate relocate out of suburbs and back into cities and newly named “innovation districts.”

new grocery delivery services

This article is about some new subscription-based grocery delivery services. This could make it even easier to live in car-free walkable communities for those who want to do that. You can shop for fresh food at a market when you want to do that, but have a steady stream of basic staples delivered on a reliable basis. Combine this with smart appliances – meaning your refrigerator and cabinets know what is in them – and you should never have to run out for an item in the middle of the night again. The only possible concern I have is whether this will push us even more towards processed, packaged food.