Nice video from NPR on Why Cities Need More Green Roofs. From the summary. “We took a field trip to the largest green roof in New York City. Then we imagined what the city could be like if all of its roof space was green.”
Regular readers of the blog know of my long-time passions of both Vegitecture and Hidden Hydrology, which both dovetail nicely into the larger themes of Landscape+Urbanism. While the L+U blog has been relatively intermittent, I’ve been hard at work developing a new website and blog for the Hidden Hydrology project. The goal is to culminate the work in some form of publication, but regardless, it seemed time to focus on that element in it’s own. I’m also giving a talk at the Washington ASLA conference in Spokane later this month (April 21), so excited to share more to a broader audience. Simply put, the project is summarized as:
“Exploring lost rivers, buried creeks & disappeared streams. Connecting historic ecology + the modern metropolis.”
Without going into too much detail that may be gained by going to the site itself, the project is broken down into four sections. The first section gives a quick overview of hidden hydrology and links to some of my original inspirations, including Anne Whiston Spirn and David James Duncan, along with an early, evocative map of Portland, along with the amazing historical ecology around the book Mannahatta.
A bit longer summary gives some context for the endeavor: “At the basic level, hidden hydrology is the buried, piped and disappeared waterways that flow under our urban areas. Development has driven underground these surface streams that used to weave through our cities – and with them we’ve lost the connection to natural systems, and robust ecological habitat that urban waterways can provide. Beyond just focusing on pure daylighting and restoration, the exploration, mapping, and study of hidden hydrology offers new ways to conceptualize a range of interventions that reconnect us to our history and offer glimpses of solutions for the future. It’s a broader concept of ‘restoration’ that looks through lenses of art, landscape architecture, urban ecology, and planning to define ways to celebrate, connect and regenerate our places.”
The second section are links to many of the resources available, including precedents, projects, and resources from around the globe. While linking to the other pages, I’m also providing links to some of the posts, including a diverse mix from Rome to London, San Francisco to Lexington, Kentucky. The range of projects isn’t limited to projects, but encompasses art, mapping, poetry, literature, dance, stream daylighting, films, community engagement, and history.
A couple of highlights, including the project “Ghost Arroyos” in San Francisco:
Or the cool mapping work of David Ramos in DC at Imaginary Terrain.
The third is an ongoing exploration of themes in a more expanded format, the site is built aroud a blog that has delved into some of the resources, and projects, but also allows for some rumination and coverage of original project work. Of the 25 or so posts to date, many have covered cities and projects, expanding to case studies and deeper investigations. These include projects inspired by hidden hydrology (such as Town Branch Commons in Lexington, top below), as well as historical maps and photos referenced in a literary context (Iain Sinclair’s ‘Swimming to Heaven’), and more in depth historical ecological studies (San Francisco Estuary Institute) to show a few.
The diversity is what surprised me, to different tendrils which weave beyond just mapping but into a multitude of subjects. An early post on the site, is illustrative of this concept, and is still one of my favorites, focused on the novel by Ben H. Winters, Underground Airlines and it’s use of the hidden hydrology of Indianapolis to tell a futuristic narrative of modern day slavery.
An excerpt from the novel explains this in a bit more detail.
“I cleared the trailer park and passed a jumble of picnic benches and playground equipment and stepped carefully down the slope of the ravine and swung the heavy beam of my flashlight along the creek. Now it was clear, with the water swollen by the rains, the direction the brown water was still flowing. The black mouth in the base of the shallow hill was an entrance, not an exit. This low little trickle of mud water was a kind of rivulet, a poor cousin of a creek, and this spot behind the motor court is where some long-ago engineer had diverted it.
The creek was called Pogue’s Run. I’d found it on the map. I’d looked up the story. This small waterway was discovered at the turn of the century – the eighteenth turning into the nineteenth — discovered and named and recorded, penciled in on early maps, when the city was not yet a city — when it was a gathering of huts, a stopping place on the way to other places. The small river was inconvenient for the city fathers and the grid they’d drawn. So they did just as Mama Walker said: they ran it underground.”
Beyond the fringes of hidden hydrology include some diversion into the very cool Atlas of Oblique Maps, a fascinating set of historical climate maps from the 1850s, and the ever popular Fisk maps of the evolution of changes to the Mississippi River.
The fourth, which is more of a long-term is projects, is still in nascent stage, but offers the potential to showcase original work around Hidden Hydrology, specifically in Portland and Seattle, but encompassing some other miscellany as well. Currently it highlights some early presentations, as well as base-mapping of the Cadastral Survey for each city, the springboard for further analysis.
The Mississippi maps inspired me to use some of the documentations to animate the changing course of the river within the valley over the last 4000 years. These more
There’s a ton of great information out there, yet it’s an area of study that seems relatively untapped and full of potential. If you’d like to contribute, know of some great case studies, and have the bug for historical maps, and how these can inform ecological design today, give a shout. In the interim, check out the site and follow @hiddenhydrology on Twitter.
And stay tuned for some more explorations here at L+U related to urban ecology and habitat, and more posts on some recent vegitecture, as I am working on some related projects and doing some more focused research in these realms.
It’s been unseasonably cold this winter (in Pacific Northwest terms at least), and while my friends to the south in Portland dig out of their recent snowstorm, locally, there are some benefits, such as the amazing phenomenon of ice circles. Captured by local photographer Kaylyn Messer, from North Bend, Washington,this one is a short distance away from Seattle, I’m hoping it stays cold through the weekend to venture out and see this in person.
From her blog:
“Ice Circles, or ice disks, are a natural phenomena where a thin layer of ice spins on top of flowing water. I heard through a Facebook post about an ice circle spinning on the Middle Fork Snoqualmie River close to where I live so I decided to check it out. I drove along the NF-5600 road peering over each bridge. I was elated to see that the circle was still intact and spinning. I spent the afternoon watching the slow rotations and listening to the murmurs of the ice. A few notches of ice were broken from the nearly perfect circle.”
A video as well to give you a true feel for this interesting phenomenon.
Interesting exploration from Architect’s Newspaper from October covering a range of water specific projects and proposals in the urban realm. A short description:
“For landscape architects today, urbanism and water go hand in hand. Whether dealing with issues of sea level rise, groundwater retention, or just plain old water supply infrastructure, landscape architects are working with scientists, engineers, and policy makers on increasingly bigger projects that encompass more external factors and larger networks of physical, biological, environmental, and political networks. We examine some of these water landscapes and how they relate to each other in the broader context of how resources and climate-related changes are being managed.”
The grid locates these twelve projects in the field, with poles ranging on one axis from Decadence to Survival and on the other pole from Not Enough to Too Much. It’s a simple diagram that shows the complexity of water and the need for regional and adaptive solutions that address multiple problems but are also specific to place. This spans climate change, drinking water, development, and ecology — balancing all of the variety of needs for livability, economy and social equity of which water is intertwined. Check out the post for more detail, but a few highlights worthy of discussion.
The issue of climate refugees is going to continually be more and more common in the news. One such example is Shishmaref, Alaska who have “…asking whether it’s better to suffer the slings and arrows of outrageous fortune or take arms against a sea of troubles to combat a looming climate change–driven disaster.” While consultants have said they should stay, a recent vote went in favor or relocating the town, which is on an island in the Bering Straight, to the safer mainland, and they are looking for the $200 million necessary to do so.
Miami is an example of a much more populated city dealing with climate issue, such as flooding and access to clean drinking water, even when the city continue to grow rapidly. “Miami’s real estate value continues to rise despite the chronic flooding risks on its waterfront. Even as local governments pour millions into tackling high tides and storm surges, deeper economic and infrastructural issues loom as threats to growth and prosperity.”
Another interesting take on flooding, Chicago is looking at underground sand deposits that were built over, and still exist, to provide a unique resilience strategy. “The challenge is immense—for Chicago, one inch of rainfall equals four billion gallons. Until recently Chicago’s answer to the problem has been an infrastructure project no less than epic—read costly—in scale. But one landscape architect is leading an effort to change how the city can unlock its hidden potential for storm water management”
On the flip side, proposals for water scarcity are happening in Texas, through innovative methods of protecting supply, as well as creating controversy as cities in Wisconsin start asking to draw water from Lake Michigan.
And what review of water would be complete without some discussion of the contentious LA River, (banner image above) which is being tackled by multiple teams and has created some rifts in the design community, particularly that of putting Frank Gehry in charge of the latest public sceme. One postive from the Gehry team (in addition to including a good mix of other disciplinares) that I’m curious about is the “L.A. River VR Experience, an initiative by media producers Camilla Andersson and Anders Hjemdahl at Pacific Virtual Reality and FoLAR… The project is currently in the final stages of production and features a VR tour along the entire LA River. “
The work of Studio Gang to develop interdisciplinary solutions to ecological projects is interesting, and the work of UrbanLab also provides some context for water projects in China.
Lots more, so check out all of these brief articles and the matrix of abundance and scarcity and decadence and survival is a unique frame to look at water solutions. Finally, for more in-depth look at one of these projects, check out my post over at Hidden Hydrology to find out more on the Town Branch Commons project by SCAPE and the ‘daylighting’ of an urban waterway in Lexington, Kentucky.
Images via ArchPaper
A fine addition to the ranks of landscape architecture journals that recently emerged is LA+, The Interdisciplinary Journal of Landscape Architecture, from the Penn. From the website, the journal is billed as the “…the first truly interdisciplinary journal of landscape architecture. Within its pages you will hear not only from designers, but also from historians, artists, lawyers, psychologists, ecologists, planners, scientists, philosophers, and many more besides. Our aim at LA+ is to reveal connections and build collaborations between landscape architecture and other disciplines by exploring each issue’s theme from multiple perspectives.”
Interest piqued. And they were nice enough to send me a copy of their inaugural issue, WILD which “…explores the concept of WILD and its role in design, large-scale habitat and species conservation, scientific research, the human psyche, and aesthetics.”
Impressively curated and designed, this is a journal you keep around in your library long-term, for a follow-up read or to peruse the beautiful imagery. As an introduction on the website, a short thesis on issue one:
“Wildness has long occupied a romantic and somewhat dormant position in the discussion of landscape theory and practice. However, current initiatives aiming to “rewild” rural, urban, and suburban environments attest to its renewed significance. It is no longer just a question of saving or protecting wilderness, but one of how we can design novel ecosystems that stimulate the emergence of new forms of biological and cultural diversity.”
The list of contributors is massive, and the breadth of topics ranges from the general, such as Mick Abbott’s ‘Practice of the Wild: A Rewilding of Landscape Architecture’, to the global, such as Richard Weller’s ‘World P-ark’, to the site-specific, like Mousseau & Moller’s ‘Landscape-Scale Consequences of Nuclear Disasters.” I offered to do a review of the issue, and realized quickly that it was no simple task due to the amount of material contained within (which alas, i’m still reading with much enjoyment).
Thus, it is far more that can be elaborated on in terms of full reporting on every essay. For that, order a copy and enjoy the density of information. Here’s a few snippets and thoughts of my own, in relation to landscape architecture practice and how the explorations of this concept seen through the interdisciplinary lens.
The concept of the wild is present in our conception of landscape architecture practice at many scales. The vision of a global park (or Ark) as Richard Weller discusses, provides the context for connected ecological corridors that connect globally across countries and continents, providing a shared concept of our earth that hopefully transcends borders. As mentioned, a north/south and east/west route “… could catalyze global cooperation and environmental investment to help augment connections between fragments along the way.” (16)
To look at the controversial and compelling issue of rewilding, as Adela Park does, is to investigate our core relationships about native-ness, genetic engineering, and our role in not just preserving, and enhancing but in recreating extinct systems as well as creating new natural systems. The ability to connect or open up large swaths of land as wild spaces are tame in comparison to global examples like the Oostvaardersplassen in the Netherlands and the Pleistocene Park in Siberia, both of which plan the creation of lost landscapes left in a state of unmanagement. As mentioned, “…landscapes such as Oostvaardersplassen – created almost entirely by scientists – embody the very indeterminacy and self-organizational potential that has been so much a part of recent landscape architecture discourse. “ (8)
The topic of wildlife and habitat is at play throughout, with the synergistic and conflicted relationships between humans and animals accentuated in multiple ways. We want interaction with nature at a distance, such as the artistic wildlife viewing structure, the Reindeer Pavilion covered in Claire Fellman in ‘Watching Wild’. We also want interaction through consumption as investigated in ‘The Taste of the New Wild’ by Orkan Telhan.
A popular strategy to engage the wild is through provision of wildlife crossings of busy roadways . as outlined by Nina-Marie Lister in ‘Xing: New Infrastructures for Landscape Connectivity,’ a movement growing in popularity worldwide and the knowledge of interdisciplinary approaches to what works is shaping the design of these systems.
The ability to predict and proactively engage with the ‘wild’ in this context, offers a new area of interest for designers and integrated teams. As Lister mentions:
“By redesigning the road for two clients – animal and human – wildlife crossing infrastructure presents a timely opportunity to communicate both the problem and the solution to the public. In this endeavor, landscape architecture has a significant new niche and a potent role role in designing safer roads with new infrastructures that are visible and legible, even beautiful. Widespread deployment of this new typology of landscape infrastructure may ultimately change the way we move and live, and with this, reconnect landscapes and habitats through inspired design.” (50)
A specific topic of interest in our northwest fire season, it was interesting to read Steve Pyne’s essay ‘Firescaping’, which provides a meditation on fire as part of our ongoing landscape, and how to think differently about our relationship to fire, and the implications and opportunities of this in the context of global climate change.
As he mentions, “We can protect our built landscape where it abuts the wild… After all, our cities used to burn as often as their surroundings; now they don’t. The same methods, adapted, can work along the fractal frontier of exurban settlement.” (97) With much of the west currently burning, the concept of wild does hit home with multiple meanings – directly related to design and management of landscapes.
As I mentioned, lots more content to devour, thus a full accounting of the contents of the first issue of LA+ would occupy multiple posts. Look out for some follow-up on some topics of interest expanding upon these and other themes, and if you’re interested, submit your work in their most recent call for papers.
And highly recommended to get a subscription to this to journal for topical, integrated ideas that shape the fabric of landscape architecture and urbanism.
The USGS tool TopoView offers access to digitized maps from 1879 to the current day – which is an amazing resource for looking at landscape change over time. Using an online mapping tool, you can access maps from 250,000 scale down to 24,000 for the entire US , including Alaska and Hawaii. The maps are downloadable in multiple formats, including JPEG, KMZ, GEOPDF, and GEOTIFF and are full size scans – so render in reasonably high resolution.
A sample of some maps (sized down from the original resolution) from the north section of Portland, ranging from 1897 through 1961 shows the difference in land use and geography – as well as indicates the shifting graphical standards of USGS maps over the years. I especially like seeing the urbanization patterns, movement of industrial lands into areas like the Columbia Slough and the (d)evolution of Guilds Like in the NW Industrial area. I hope to add these to the layering of historical mapping that we’ve already developed.
There are definitely more maps I wish existed – in different sizes – but as referenced on the site, the maps were created to highlight different features of land use – so it wasn’t fully consistent. Per the website:
“In 1879, the USGS began to map the Nation’s topography. This mapping was done at different levels of detail, in order to support various land use and other purposes. As the years passed, the USGS produced new map versions of each area. The most current maps are available from The National Map. TopoView shows the many and varied older maps of each area, and so is useful for historical purposes—for example, the names of some natural and cultural features have changed over time, and the ‘old’ names can be found on these historical topographic maps.”
For more info – a short video walks through the usage of the TopoView features. A resource worth more exploration for sure.
I recently gave a talk at the great annual conference Urban Ecology Research Consortium of Portland/Vancouver (UERC), which focuses on ” advance the state of the science of urban ecosystems and improve our understanding of them”. I was really excited to be chosen to present (i had done a poster presentation in past years), and it seemed a great way to introduce the Hidden Hydrology of Portland and what work has been done to date.
Much of this has been covered on the L+U blog – but there’s new ideas worth exploration, and some new momentum to realize some of the site-specific installations discussed here. A short visual recap:
My first experience with the concept was stumbling over the ‘Disappearing Streams’ map produced by Metro. Not sure of the vintage – but I remember seeing this easily in the late 1990s, and it’s stuck with me for years. Not actual streams but modeled topography generating basins – the concept is pretty simple – show what streams existed, and highlight those buried, piped, channeled in red, which is predominately on the inner east side and downtown.
A bit of digging yields a great set of maps, the Cadastral Survey of 1852 provides amazing detail of a nascent Portland, with stream corridors like Tanner Creek still intact running through downtown Portland, and other ecological resources (wetlands, lakes) as well as trails and early city grid (seen to the right)
A few folks share this passion, such as David James Duncan, who talks of disappeared streams in his book ‘My Story as Told by Water’ (2002) and historical account from folks like fellow Tanner Creek nerd Tracy Prince, who has authored some great accounts of the areas in Goose Hollow and Slabtown, evoking origins of place names, connections to hidden creeks, and tying this together with the rich history of Portland’s development.
Many layers interact in painting the picture of hidden hydrology. Photos are another great resource – with historic scenes of sewer creating, as well as floods and other historical events.
Beyond the Cadastral Survey, a wealth of maps exist, ranging from the mid 1850s through today – which paint a temporal portrait of the path of waterways over time – such as Tanner Creek, here shown still in existence in 1866.
And through an illustrative Aerial Lithograph here in 1870 – again showing the Tanner Creek drainage from the West Hills through the north portion of downtown.
Using these tools we can start to craft maps that take the historical and overlaying information – in this case a composite of Cadastral survey mapping, amended with other information, notes, and annotations – a layered history in map format. These could easily be hosted online (a future plan) for additional input and integration with stories, photos, experience.
The process of extracting this information from the survey – shown here in a few steps – involves 1) referencing the historical layers, 2) adding streams and other water bodies, 3) adding additional info such as wetlands and other topographic featueres, and 4) georeferencing and overlaying the historic with the current day mapping. A reverse map regression that allows us to create an interesting connection between then and now.
Because the Cadastral survey is based on the Public Land Survey System (PLSS) – the township, section, range geometry (see the faint orange lines in the map above allow the historic and modern to overlap with reasonable fidelity through cartographic rectification. The maps then, overlaid with GIS data – then digitized into shapefiles with linked data – start to allow us to provide some more detailed analysis – such as for instance, correlating basement flooding in proximity to old streams?
The second part of the talk focused on interventions – as the maps are compelling, but the ability to use them for actions are key, both in terms of expanding the validity of our interventions, but also to connect folks everyday to their hidden nature.
My colleague Matt Burlin and I have been talking about tours of the Hidden Hydrology for some time – so recently took the field maps for Tanner Creek and traced them from up towards the headwaters near Washington Park Zoo, down through the west hills and through downtown.
There are portions that still exist – albeit in a somewhat degraded form – but the visceral thrill of seeing this stream was compelling – The immersion in the sounds and experiences of these remnants is worth further visits.
And as you get to the urban sections, the natural remnants make way to a creek completely hidden – save a subtle topographic cue and some cultural interventions of markers and Tanner Springs Park, before getting to the current outfall location in the Willamette, near Centennial Mills.
How do we interact with that which is hidden, bringing lost layers of history back to the surface. Some great art installations provide inspirations that could be applied to hidden hydrology, for instance the Freen The Billboards project (which used fixed viewfinders to overlay images on billboards)…
Could be applied in zones to allow one to click through a series of images that show the stages of current, mapping, routing, and location of historical waterways – in this case a simple illustration of how this would work for Tanner Creek.
And drawing from the functional aspects of utility locates with the community artistry of intersection repair…
…one could imagine a meandering Tanner Creek weaving its way through downtown and northwest Portland streets, taking the idea of a couple of markers in the sidewalk to a much higher level of engaging and awareness in the underlying historical systems.
Thinking beyond a map or a kiosk with some informational interpretation, the array of interventions together provide multiple ways to engage, and coupled with technology could yield self-guided walking tours, vivid sound maps, and immerse multi-media experiences.
On a larger scale, the idea of Hidden Hydrology inspires thinking about community and our connections to each other. The concept of Neighborsheds, which i coined in the mid 2000s and presented at the ASLA National Conference about – involves using these natural drainages to redefine neighborhood boundaries. By rethinking political or cultural boundaries defined outside of natural systems, we can reconnect to our place in new ways. This knowledge is perceptual on one hand – but can engage folks in shared commitment – because if you’re in the neighborshed, all of your actions become innately connected in you cumulative impact downstream.
Finally, for me the concept of the Hidden Hydrology is tied to the larger ecological history. There is no better project to illustrate this that the Mannahatta Project (read more on a post here) which in it’s broader incarnation as The Welikia Project, takes the notion of historic mapping and blends field observations of biotic and abiotic factors in a rich and illustrative composite that is both rigorous and compelling.
My call to action, to create this detailed historical ecology for Portland, blending historical mapping with history, archaeology, anthropology, ecology, and other disciplines to paint a vivid picture of this historical ecology.
Beyond being fodder for art and culture, defining neighborsheds, or ways of engaging in urban exploration and wayfinding – there are some key opportunities available with this information. This can be inspiration for design interventions, can guide decisions about habitat, ecology, water, runoff, vegetation, and other factors, not in a general sense but in a block by block, historical watershed and stream basin scale.
The overlay and congruency with the hidden streams and our subsurface pipe systems is no accident – each are governed by system conditions of gravity. One is surficial and the other is hidden, so opportunities for making adjustments to the gray systems can be augmented with opportunities to use the green systems – with potentials for daylighting, integration of green stormwater infrastructure, and replication of pre-development hydrology. These decisions aren’t just based on current conditions (i.e. paved, permeable, landcover), but can be guided by understanding and modelling the pre-development hydrology – the best guide to how a particular basin wants to act by referencing how it worked before we altered it.
Finally, the concept of a pre-development metric is used for many things – to set stormwater management goals, to measure runoff in site and basin scales, and to set targets for sustainability for ecodistricts and other planning scale efforts. The return to the ‘native forest’ is a generalization of the pre-development condition, and also becomes a technological construct. Rather than pre-development condition, let’s thing of historical ecological function, which begins to not just provide us with numbers to meet, but also blends the vegetated, the ecological, the habitat, the cultural with the historic sounds, smells, textures, and colors the historical places before we forever altered them.
We won’t restore these to their natural state in all but a few selected places, but if we can restore, through metaphor, interaction, and intervention, the experience of these places, blended artfully with what they are now – places to live, shop, play – we reveal these hidden layers of inspiration to the urban experience.
A short video of the presentation is in development – and a longer follow-up, brownbag session is in the works – so look out for details.
A project of note that made the rounds over the past month resonated with the concept of Hidden Hydrology. The project ‘Ghost Arroyos‘, proposed as part of the Market Street Prototyping Festival paints the town blue, in a sense. I definitely like this idea, as we’ve discussed doing a similar exploration of Portland’s Tanner Creek.
From the Neighborland site description
“Every city has invisible histories embedded within its landscape. This project, “Ghost Arroyos” seeks to reveal the forgotten waterways of San Francisco through a simple, but powerful intervention. Situated between 7th and 9th street, the project will abstractly mark the footprint of Hayes Creek onto the urban surface. Visitors to the festival will be invited to trace the extent of the waterway while listening to a curated recording of hydrological soundscapes and oral histories”
Sounds much like the hidden hydrology proposals – and i’m curious to see it happen and what hurdles need to be overcome in implementation. Also, the soundscapes and oral histories are an interesting concept – that we’ve been exploring as well, so lots of great alignment to draw from.
Upper Yosemite Creek Daylighting
In digging into this project a bit, there was also a link to a proposed actual creek daylighting being proposed by the City of San Francisco is the Upper Yosemite Creek.
From the site: “The Upper Yosemite Creek Daylighting project will daylight the ephemeral historic Yosemite Creek to manage flows from 110 acres of McLaren Park. The creek will flow along the northern edge of McLaren Park from Yosemite marsh through Louis Sutter Playground and along the southern edge of University Mound Reservoir. The project will feature a creek channel to convey stormwater and alleviate localized flooding issues as well as storage and infiltration facilities. This project is the first creek daylighting project initiated by the City and will reintroduce natural habitat and provide opportunities for community learning and beautification.”
The reports are worth checking out – as it’s an interesting concept. The new ‘creek’ is a hybrid, while daylighting, the configuration, as seen above, interfaces with the built environment in a somewhat orderly manner and starts to look more like green stormwater infrastructure than natural waterways. This mediating between what was and the ‘functional’ aspects of the restoration is worth further exploration.
Two great examples from San Francisco on hidden hydrology in action.
Last week, I had the honor recently of presenting at a conference with one of my idols of landscape architecture, Anne Whiston Spirn. Aside from stimulating conversation, she presented the old and new of her work from The Granite Garden through her ongoing work on the Mill Creek Project in Philadelphia, i was reminded of the tenets of persistence and the need to not work behind the scenes, but to continue to strive outwardly to make ecologically driven, research based, green and livable cities. As many know that is inspired in me through work with water and watersheds, but also storytelling and ways to make evident that which is lost or merely hidden. That inspiration comes many sources, but very much from the work of Ms. Spirn.
To capture my work and continue it in some form – i transferred some posts from the early days of my firm back in 2010 that formed the foundation of an ongoing work that is gaining more momentum in recent weeks, and worthy of a dusting off. Partially as the blog is an archive of work and things i want to capture and remember – partially it is an opportunity to rework and re-frame these issues in a new time with some new energy. Some folks will have seen this before in various forms – to others this might be new. Over the next few days, i will repost some of the inspirations, starting today with the introduction – followed by some origins gleaned from others through the readings and explorations. In all, it the various threads of this perpetually wandering generalist may be coming together to form a web, and with luck and work, a tapestry.
Hidden Hydrology – Portland Series Introduction
Originally published on Terra Fluxus – 12/21/2010
In the next year, TERRA.fluxus will be initiating a multi-phase project to explore the Hidden Hydrology of the city of Portland as the main research activity for the near future. I have been fascinated with this since my first glimpse of the Disappeared Streams map published by Metro (will get my hands on one soon and give a glimpse) and it’s eventual configuration into a 2006 ASLA Presentation on ‘Neighborsheds for Stormwater Management‘ as an preliminary exploration of the concept. The particular Metro map highlighted ‘historic’ streams that had been buried and piped through development of the City of Portland over the course of the last 150 plus years, showing existing as blue and those ‘disappeared’ in red. While many westside creeks still ran free, the entire eastside was vivid red, long covered by roads, industrial buildings, houses, parks, and more. While the methodology on that particular map was suspect (relying more on topographic analysis than hydrological markers), there are plenty of sources for historic waterways in maps, photos, and on-site investigation.
Thus the focus of the project, utilizing multiple sources to gain a more complete understanding of the underlying hydrological history of the area, with an aim towards using this information both in traditional planning and design manners, but also as the touchstone for a series of speculative works.
Portland, of course, has always been, and still is, a river city. We live around waterways and bridge lifts, and relying on water for our recreation and port traffic, as well as giving us the overall image of our city. Tucked along the banks of the Willamette and its confluence with the Columbia, the history of water mirrors the history of urbanization, from the initial settlement patterns and grids of the 1850s up to modern conditions. The early, or ‘pre-development’ snapshot is best captured in this compilation map of the 1852 Cadastral Survey, which was created right after the incorporation of Portland as a city in 1851. This map, and others (a great collection of which can be found at the Bureau of Environmental Services site), will play parts in analysis throughout the project.
You can spend hours looking at this map, and placing the vision of this early city compared to it’s eventual form. While Portland’s rivers and streams are beautiful – they are also highly troubled, with dual issues of industrial pollution and combined sewer overflows working in tandem to create issues for native fish (and people), landing many of our major waterways on lists of the most polluted rivers. The idea of hidden hydrology is evident not in the still visible (although they are intimately connected), but those ‘urban’ waterways that over the years have changed from open streams and creeks to become piped as ‘infrastructure systems’ to deal with expanding growth of the metropolis. Thus we look at the slow erasure of natural topography and hydrology at work in a political sphere, and begin to see what remains of this palimpsest.
The most urban example is found in Tanner Creek, the historic downtown river that wound through downtown for over fifty years, remaining intact (in form if not in quality) through urbanization, as seen in this 1881 illustration looking at downtown towards the northeast.
The proximity of this creek to development (and the Tannery) led to pollution and sanitation issues downstream, so as with many urban creeks, a period of modernization happened, in this case the 1917 implementation of the Tanner Creek Sewer project. This forever buried the main stem of this historic creek through the heart of downtown in brick vault sewer (many of which are still functioning, or have recently been replaced).
:: images via Bureau of Environmental Services
While the historic are interesting in their own right (and there are ample sources of material to digest so more to come on this), the interaction of the new and old is both dynamic and informative. Moving to the Southeast Quadrant, we can isolate the more detailed Cadastral maps (the survey developed the township, section geometry used today, thus giving us the ability to overlay old and new with a measure of precision). The coverage through the 1850s and 60s is quite extensive, and will be useful when reconciled with the existing GIS coordinate systems. An inverted version of the original survey maps gives an indication of their density of information. The study area will be in the upper right hand quadrant of this township scale map.
A series of maps utilize GIS layering along with historical mapping underlayment to create a modern ‘routing’ for a stream in the lower Taggart basin. First a section of the historical map (1852) was analyzed for hydrologic features (river, stream, wetland, etc.) based on the map features present at the time of the survey. These are accented to show their location for referencing to other maps.
The topography and street grid are overlaid to show the relationship of water features to current configurations. The addition of hillshade allows for fine-tuning of hydrological features to match remnant topographic that has not been leveled or erased through development.
Following this, the combined ‘hybrid’ map is reconciled into a workable base that is accurate to the historical location of ‘urban streams’ as well as current urban form. Additional layers are added, and the iterations of analyses are only limited by time and usefulness. Groundwater, soils, historical aerial photos, vacant lands, floodplains, and vegetative cover are just a few that spring to mind from glancing at Metro’s stock of layers. I am also already other gathering data for a planned comparison with BES Subwatersheds, which mirror directly the configuration of subsurface pipe infrastructure that replaced these open channels sometime in the last 100+ years. While our technology allows us to perform feats unbelievable to the 19th century Portander in lifting, pumping, and moving materials, there is still an inherent consistency and efficiency of using gravity to move water and waste that still makes these historic systems relevant as blueprints for existing conditions.
The other idea is to use this information for potential projects and interventions – looking opportunistically at the relationship of these systems over time and space. To kick of this aspect, the next phase of analysis for this area will also be to ‘ground-truth’ the map hybrids – through a series of documented urban explorations (in the spirit of the Center for Land Use Interpretation perhaps?), along with further refinement, historical research, and analysis throughout 2011.
Stay tuned for more info after the new year.
An interesting idea from some of the coverage of Memorial Day, which is a good time to remember the past. The Guardian and the Photography Then and Now, which includes interactive before and after images – essentially exact matching shots of the old and new through historical events. This weekend, they posted some interesting photos of WWII, juxtaposed on top of google street view. For instance, the remnants of bombing in London (top photo) and the Germans on parade down the Champs-Elysées in Paris (both 1940).
It got me thinking that the ability to apply the same process to the historical hydrology. Aided by digital tools and a good eye, you can quickly do a photo match (or map illustration match) and with some minimal tweaks of perspective, provide this unique perspective of old & new in terms of water.
This power can also be applied to the concept of hidden hydrology, as this very quick example below, inspired by the photos above, gives a taste for the potential of this on the historical maps, overlaid with google earth imagery at an approximate perspective. A bit more difficult when you are looking at a broad perspective, but still possible.
One of the interesting illustrative maps of Portland, this small snapshot of a much larger artists illustration (1879) of the aerial view looking from the West Hills toward the east, across the downtown and with the routing of Tanner Creek bridged but not quite yet buried.
With a few minor tweaks, you get a reasonable photo match. In a subsequent version, I’d try to include more of the current Google Earth view, to give it a bit more of the surrounding context, but you get the idea, and each photo will have it’s own character and story.
The water course of Tanner Creek could potentially be traced along the historical photograph, as it weaves through the West Hills towards the northwest into the Willamette River.
And more of the remnant of the water course as it would have flowed through the current pattern of City. A stream or creek isn’t just a monothematic band of blue either – it evokes an ecology of plant and animal life, as well as the story of use (and misuse) by early settlement and subsequent piping and erasure.
Aside from being an exercise purely to show the old and new – this can also allow us to look at the maps of Tanner Creek from the 1850s and see if this illustration aligns with these – both as a ‘field verification’ and supporting evidence. Imagine the creek weaving through downtown, by
PGE Park, Jeld-Wen Field, Providence Park, and etching lazy meanders through the condos of what is now the Pearl District before draining into the Willamette near Centennial Mills.